EVO MODULAR

AIR HANDLING UNIT

AHU N o 18.08.003
Range : EVO

aera.com.tr
AERA was founded in 2016 by national and international

partners to be an important player in HVAC industry

with its young but experienced spirit, innovative product

design, sustainable quality control assurance system

and advanced logistics. AERA aims to present products

and solutions to meet the increasing demand on energy

efficiency and human comfort.

AERA is located in Izmir with its production facilities

and R&D center of excellence and in Istanbul with its

Sales Office. The efficiency and the effectiveness of the

manufacturing is ensured with modern production and

IT systems. All production processes are monitored with

intensive quality control processes in accordance with the

national and international regulations and norms to ensure

the quality of the end product and overall efficiency.

MAIN PRODUCT GROUPS

Modular Air Handling Units

Compact Air Handling Units

Heat Recovery Ventilators

Ventilation Units with integrated Heat Pump

Water Terminal Units (Fan Coils)

Chillers

A E R A A I R I N N O V A T I O N 3
 STANDARDS

EVO-M Modular Air Handling Units introduce comfortable air to indoors with high energy efficiency and European Norm
compatible design. Below required norms and standards are applied during the design process;

EN 1886 Ventilation for buildings. Air handling units. Mechanical performance

EN 13053 Ventilation for buildings. Air handling units. Rating and performance for units, components and sections
EN 13779 Ventilation for non-residential buildings. Performance requirements for ventilation and room-conditioning
systems
EN 308 Heat exchangers. Test procedures for establishing the performance of air to air and flue gases heat recovery
devices
Commission Regulation (EU) No 1253/2014 ECO-DESIGN Requirements for Ventilation Units
EUROVENT

EN 1886

Air Handling units are classified according to their casing performance with the European Norm; EN1886. Testing and
classification procedures are explained in the standard.

CASING CLASSIFICATION ACCORDING TO EN 1886

EVO TEST CRITERIA

Casing Mechanical Mechanical Strength Class D1 D2 D3

D1
strength Maximum Relative Deflection mm x m-1 4 10 exceeding 10
Casing Air Leakage Air Leakage Class L1 L2 L3
Negative Pressure L1
-400Pa Maximum Leakage (f400) I x s-1 x m-2 0.15 0.44 1.32
Casing Air Leakage Air Leakage Class L1 L2 L3
Positive Pressure L1
+700Pa Maximum Leakage (f700) I x s-1 x m-2 0.22 0.63 1.90
Filter Leakage Class F9 F8 F7 F6 G1~F5
Filter bypass leakage F9
Filter by pass leakage rate 0.50 1 2 4 6
Thermal transmittence class T1 T2 T3 T4 T5
Thermal transmittance T2
Thermal Transmittance (U) W x m-2 x K-1 U≤0.5 0.5<U≤1 1<U≤1.4 1.4<U≤2 Non standard
Thermal Bridging Class TB1 TB2 TB3 TB4 TB5
Thermal bridging TB2
Thermal bridging function (kb) 0.75<Kb≤1 0.6<Kb≤0.75 0.45<Kb≤0.6 0.3<Kb≤0.45 Non standard

Mechanical Strength of the casing

The mechanical strength of the casing is indeed the

strength of the structural construction of an AHU. The
classification of this parameter is based on the deflection B
of the panels and frames of the air handling unit. During
the tests, the unit is subjected to an internal positive of
A
1000 Pa and then to an internal negative pressure of
1000 Pa. In both cases deflections shall be measured.

Then the unit is subjected to higher pressures, in order

to withstand the max. fan pressure without permanent
deflection (is considered permanent deflection for values
>2mm), to an internal positive of 2500 Pa and then to an
internal negative pressure of 2500 Pa. Once again all the
deflections shall be measured.

Maximum Relative Deflection

Casing Strenght
[mmxm-1]

D1 <4
D2 <10
D3 > 10

4
Casing Air Leakage

This is a key parameter to understand for one hand if all the energy consumption used in the fan is used to generate the
exact airflow of the operation set-point, and on the other hand to understand if we have infiltration of non-handling air inside
the AHU. The casing air leakage test is performed after the mechanical strength test. It performed by subjecting the unit
to an internal negative pressure of 400 Pa, measuring the leakage rate through the casing. Then the same procedure is
repeated but now subjecting the unit to an internal positive pressure of 700 Pa, and leakage rate shall be measured.
Casing Air Leakage @ + 700 Pa Casing Air Leakage @ + 400 Pa
Leakage Maximum leakage rate Leakage Maximum leakage rate
Class (f700) ( l x s-1xm-2 ) Class (f400) ( l x s-1xm-2 )
L3 1,9 L3 1,32
L2 0,63 L2 0,44
L1 0,22 L1 0,15

CASING AIR LEAKAGE TEST APPARATUS

6
5
1. AHU under test
2. AHU test pressure gauge
3. Bleed valve as alternative to variable speed fan
4. Variable Speed Fan
5. Air Flow Measurement
7 6. Inlet Plate
7. Outlet Plate

Filter by-pass leakage

Because of the leakages through the internal design of the filter assembly, the filter of the unit may not be performing
as its specification. This criteria is especially important for buildings with high IAQ demands, for example hospitals and
laboratories. In the filter bypass leakage test, the unit is subjected to an internal positive and negative pressure of 400 Pa

LEAKFREE FILTER SLIDING SYSTEM FILTER BY-PASS LEAKAGE TEST APPARATUS

2 3

2
4
6
3 4

5
7

1
5

1. Top Panel 1. Test Unit

2. Filter top connection part 2. Inlet Plate
3. Male Aluminum Tray 3. Filter cells and sealed filter frame
4. Female Aluminum Tray 4. Filter section
5. Sealing 5. Casing
6. Compression Mechanism
7. Filter

A E R A A I R I N N O V A T I O N 5
 STANDARDS

Thermal Transmittance

Air Handling Units are sized in heating/cooling capacity by neglecting the losses from the casing. Especially for the outdoor
installaitons, according to the temperature difference between the supplied air and outdoor air, significant losses may
happen with poorly designed casings. EVO product family is designed with 50 mm Mineral Wool insulated panels to
reduce the thermal leakage from the casing. Adequate design is carried out for weakest surfaces like corners, locks and
hinges and duct connection panels.

Thermal transmittance is measured and calculated with 20K temperature difference between the outdoor air and inside
the unit.

Thermal Bridging of the casing

Because of the thermal losses in an air handling units components like section connections, structural profiles, doors
and hinges, casing corners and panel internal/external sheet metal, the installation properties of the casing can not be
homogenous through the whole casing. Places such of those where the insulation properties are reduced are called the
Thermal Bridges. If the Thermal Bridges can not be avoided, there will be significant amount of heat loss and condensaiton
will occur on these surfaces damaging Air Handling Units casing.

The test is performed in conditions when the difference in average temperature between the interior and exterior temperatures
is steady at 20 K. The point at the highest temperature on the outer surface of the casing shall be measured. The ratio
between the difference between the interior average air temperature and the maximum external surface temperature and
the average temperature difference between the air on the interior and exterior of the unit determines the thermal bridge
factor.

ti2 Ti - tsmax
ti1
ta1 ta6 kb =
ti - ta
250

25 ti6
0
ti5
k b = Δtmin / Δtair
ti4 ti10
250 ta3
ti3 ti9 Where:
Height from floor

ti8 ti14
ta2
300~400 mm

250
ti7
ti3 Δtmin: is the smallest temperature difference,
ti12 Δtmin = ti - tsmax
100
250

ti11
250 ti16 Δtair: Temperature difference between the interior
100

ta5 tn4
ti15
and exterior air, Δtair = ti - ta
100

100
100

6
Below rendered psychometric chart presents the outdoor air conditions where condensation will start in an Air Hadnling
unit with different Thermal Bridging classes. From the diagram it can be read that for an outdoor air temperature of -12°C
inside the unit casin and 24°C installaiton space, condensation will not start before 18%RH for TB4, 28%RH for TB3, 40%
for TB2 and 57% for TB1.

10 11 11 12 12 13 13
5 0 5 0 5 0 5
30
10 34 15
0 0

TB4 (kb=0,30) 24°C, 18 % r. h. 35 33

95
TB3 (kb=0,45) 24°C, 28 % r. h.

0.96
30 32 14

0.98
30 5

0.94
TB2 (kb=0,60) 24°C, 40 % r. h. 90 31

TB1 (kb=0,75) 24°C, 57 % r. h. 85 25

30 14
0
29

80 30 28
13
W 5
ET
BU 27
75 LB

0.92
TE 26
M 13
PE 0
70 RA 25
TU
25 RE
-° 24
20 25
65 C 12
23 5

HUMIDITY RATIO - gr MOISTURE / kg DRY AIR

60 22
12
kg

25 21 0
J/

VAPOR PRESSURE - mmHG

0.90
55
-k

20

ENTHALPY - kJ / kg
PY

SPEC
AL

19 11
50 5
°C
TH

90%

IFIC
P-
EN

20 15 18
EM

20

VOLU
1

45
NT

17
11
TB
0.88
80%

0
TIO

ME m
16
RA

40 20
TU

³/kg
15

%
SA

25
10
5
70

35 14
15 13
2
%

30

TB
10
60

10 12 0
15
20 11
0.86

25
%
50

15 10 95
10
10
3
% 9
10 15

TB
0.84

10
%
40

8
90
5
5 7

DEW POINT TEMPERATURE - °C

%
0 5 30 5
0.82

TB 4
85
-5 0 5
0 8% 0
0.80

-1 20% 4
0
6%
-5 IDITY 80
-1 HUM 3
TIVE
0.78

5
-10 RELA 4%
%10 -10 2
0.76

-15
2%
0.74
0.72

-20 1 75
-40
-20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60
DRY BULB TEMPERATURE - °C
70
15 20 25 30 35 40 45 50 55 60 65

PSYCHOMETRIC DIAGRAM AT SEA LEVEL

Acoustic Insulation of the Casing

Casing of an air handling units not only helps to reduce the thermal and air leakages but also reduces the transferred sound
from the casing to the supplied air. The sound insulaiton of the casing is named as the Transition Loss and measured for
1/3 Octave Band and listed in the casing specifications.

A E R A A I R I N N O V A T I O N 7
 STANDARDS

All manufacturers are legally obliged to follow ECO-DESIGN directives, which are a set of
the European Union's regulations that state use of energy for energy-consuming products.
LOT6 of the directive reviews the ventilation devices and air handling units and is affective
in the European Parliament with the EU directive number 1253/2014 and 1254/2014. The
ECO-DESIGN directives, prepared by the European Council for the purpose of replacing
low energy-efficient products in the market with those of high efficiency, have been
accepted as a prerequisite for CE marking with the dates specified and the entry of non-
conforming devices into EU countries is prohibited.

Within the scope of the ECO-DESIGN directive, which has been in force since January 1st 2016, a number of sub-limit
values have been defined for air handling units, such as fan, heat recovery exchanger and filter efficiency. There are also
directives concerning the operation of the air handling unit.

ECO-DESIGN Application Criteria

The Directive has been created for ventilation devices and air handling units where some
For which applications does the
or all of the air contaminated by human activity or building emissions in the interior is
ECO-DESIGN directive apply?
replaced by fresh air from outside.

Residential Ventilation Equipments (RVU) Qmax ≤ 250 m 3/h Non-Residential Ventilation

Device Classification Devices (NRVU) Qmax> 250 m 3/h Residential Ventilation Devices (RVU) * 1000 m 3/h >
Qmax> 250 m 3/h

Tier 1: January 1, 2016

Implementation Schedule
Tier 2: January 1, 2018

Agricultural ventilation applications

Transportation applications
Exhaust hoods in industrial kitchens
Fresh air or exhaust devices with a power consumption of 30 W or less and a one-way
airflow
Unit Exceptions
Bi-directional flow devices with a power consumption of 30 W or less for each fan
Axial or radial fans in a body according to EU 327/2011
Fans operating in explosive atmosphere
Emergency fans
Fans operating at very high or very low temperatures

* In cases where the manufacturer states that it is for residential use.

8
Unidirectional Ventilation Units (UVU)

The model device is defined in the directive as follows.

Airflow is one-way (supply or exhaust only).

On the inlet side there is a class F or better filter.
There are one or more fans in the same air line inside the device.

In the Directive, the limit value for minimum fan efficiency

and SFPint is specified as follows.

ErP 2016 ErP 2018

Minimum Fan Efficiency P≤30 kW 6,2xln(P*)+35 6,2xln(P)+42

n s (%) P>30 kW 56,1 63,1
The maximum allowed SFP int [W/(m /s)] value for the model device
3
250 230
Variable speed drive requirement Yes Yes
Obligation to monitor pressure drop for filters No Yes

* Nominal Effective power supply at nominal external pressure and air flow, including electric power supply (kW), fan motors and drives of
motors.

Bidirectional Ventilation Units (BVU)

The model device is defined in the directive as follows:

Airflow is bidirectional (with supply air and exhaust)

There is a class F on the supply air side and a class
M filter on the exhaust side.
The unit has a heat recovery system.

In the Directive, the limit value for minimum fan efficiency and SFPint is specified as follows:

ErP 2016 ErP 2018

Heat recovery system with thermal by-pass mandatory Yes Yes
Thermal Efficiency (EN308)*1 t [%] Plate / Rotary HR 67 73

Maximum allowed SFP int value for model Plate / Rotary q* < 2m /s
2 3
1.200 + E - 300 x q / 2 - F 1.100 + E - 300 x q / 2 - F
device HR q ≥ 2m /s 3
900 + E - F 800 + E - F
HR efficiency addon, E Plate / Rotary HR ( t-67) x 30 ( t-73) x 30
Model Unit 0 0
No M filter 160 150
Filter correction coefficient, F
No F filter 200 190
No M + F filter 360 340
Variable speed drive requirement Yes Yes
Obligation to monitor pressure drop for filters No Yes

* 1 EN 308 conditions are internal and external weather conditions where condensation has not occurred and should be taken as
follows. OUTDOOR AIR CONDITIONS: 5 °C ROOM CONDITIONS: 25 °C, 28 % RH
* 2 Air flow at the working point of the device (m 3/s)

A E R A A I R I N N O V A T I O N 9
 STANDARTLAR

SFP int Value and Calculation Method

According to EN 13779, the SFP is calculated as the ratio of the fans of the air supply unit provided by the unit.

In ECO-DESIGN directives, the

SFP value is redefined as SFPint.
The SFPint value relates to the
SFPint = 100 *
( ∆P int, nom, SUP
e, SUP
∆P int, nom, EHA
e, EHA (
performance of the components

RETURN AIR AIR

∆PFan, total, EHA
used in the design of the device, and

OUTSIDE AIR
does not take the ducting system ∆Pext, EHA
inefficiencies into consideration.
This provides a more accurate
comparison between units. The
internal losses to be taken into
account in the SFPint calculation are
pressure losses in the heat recovery
exchanger, filter and housing.

SUPPLY AIR
Sample Calculator: The table below
EXHAUST AIR

shows the operating point for the

internal pressure drops in a heat ∆Pext,SUP ∆Pint ∆Pek
recovery ventilator. The SFP value
is compared with the SFPlimit value
specified in the ECO DESIGN
criteria, calculated by these values ∆PFan, total, SUP
and fan efficiencies. If the SFP
interior is smaller than the SFPlimit
the device meets the ECO DESIGN
criteria.

Intra-device pressure loss [Pa] External

Fan efficiency at the operating
Static
HR Supply Air Filter (F7) System point (including external static SFPint
Total pressure
Exchanger Exhaust Air Filter (M5) Loss pressure)
(Pa)
Supply Air 179 109.97 44.75 333.72 100 0.596 559.9
Exhaust Air 180 90.86 44.75 315.61 100 0.596 529.5
SFPint, total 1089.5

Filter Correction Factor, F M5 and F7 filter 0

HRE efficiency addition, E (ηt-0.67)*3000 30
SFPiç, limit (2016)
1200 + E - 300 * qnom / 2 - F 1146.66

Where the ventilation unit is not designed for a single operating point, compliance with the ECO-DESIGN directive should
be indicated on the unit operating curves. The following chart shows an ECO-DESIGN performance curve for an air
handling unit with variable airflows.

PERFORMANCE CURVE

1400

1200
External Static Pressure (Pa)

1000
AIR PERFORMANCE CURVE
800 ECO DESIGN 2018
ECO DESIGN 2016
600
MAXIMUM RECOMMENDED AIR VOLUME (m3/h)

400 ECO DESIGN 2018 WORKING AREA

ECO DESIGN 2016 WORKING AREA
200

0
0

250

500

750

1000

1250

1500

1750

2000

2250

2500

2750

3000

3250

3500

3750

4000

Air Flow (m3/h)

10
EUROVENT

Eurovent is an organization set up by leading European

Air Handling Unit Manufacturers to ensure fair comparison
and fair competition. In accordance with the sampling
program, the air handling units and components are
correctly classified using the performance information AHU N o 18.08.003
Range : EVO
obtained in tests conducted in independent test
laboratories.
At the beginning of the certification program, the unit, which is requested by the certification committee, is produced by the
supplier, the unit is sent to the test and the casing and performance values ​​are reported. According to the manufacturer's
Quality certificates, the tests are repeated every year or every 3 years. Thus, the accuracy of the catalog data of the
products and the results of the selection software are checked within tolerances and an attempt is made to create a trust
environment within the market.

ENERGY CLASSIFICATION TABLE

UNITS FOR FULL OR PARTIAL OUTDOOR AIR

ALL UNITS
AT DESIGN WINTER TEMPERATURE ≤ 9°C.
CLASS
HEAT RECOVERY SYSTEM (HRS) FAN EFFICIENCY
VELOCITY class
LEVEL
[m/s] ηclass [%] ∆pclass [Pa] NGref-class [-]
A+/A+ /A+ 1.4 83 250 64
A/A /A 1.6 78 230 62
B/B /B 1.8 73 210 60
C/C /C 2.0 68 190 57
D/D /D 2.2 63 170 52
E/E /E No calculation required Not required

CLASS CLASSIFICATION SYMBOL CLASSIFICATION PARAMETERS

Face Velocity
Heat Recovery Efficiency
Units for full or partial outdoor air at design A+·····E
winter temperature ≤ 9°C. Heat Recovery Pressure Drop
Fan Efficiency
Recirculation units or units with design inlet Face Velocity
A+ ·····E
temperatures always > 9°C. Fan Efficiency
Face Velocity
Stand-alone extract air units. A+ ·····E
Fan Efficiency

The following steps should be taken while calculating the class of the air handling unit;

It is assumed that the air handling unit belongs to a class and the values belonging to this class are noted in the table.
For the design working point, the fan static pressure increase, external static pressure loss, cross-sectional speed,
fan power and, if the unit belongs to subgroup 1, the HRS heat recovery exchanger efficiency and pressure drop are
calculated.
Depending on the velocity, the pressure correction factors ΔPx is calculated if it belongs to subgroups 1 then ΔPy and
ΔPz are additionally calculated.
The reference power consumption (Pair side-ref) for the associated air line (fresh air or exhaust) is calculated.
Finally, the reference power consumption factor (fs-Pref) is calculated. If this value is equal to 1 or smaller, the unit meets
the requirements of the first accepted class. If it is greater than 1, the same procedure should be repeated by adopting
a lower subclass.

A E R A A I R I N N O V A T I O N 11
 STANDARTLAR

Pressure correction due to velocity; Δpx

{ ( Vsınıf
( {
1.4
∆P x = (∆Ps-dahili - ∆Ps-HRS) * 1-
Vs

∆Ps-internal = Δps– static - Δps– external internal pressure drop across components; exclusive system effect pressure
drops [Pa]
∆Ps-static = useful fan static pressure increase measured between fan inlet and fan outlet [Pa]
∆Ps-external = external (ductwork system) pressure drop [Pa]
∆Ps-HRS = HRS pressure drop [Pa] (0 if no HRS or subgroup 2 or 3)
Vclass = value from Table 2 [m/s]
Vs = velocity in AHU filter (fan if no filter) cross section [m/s]

Pressure correction due to HRS pressure drop; Δpy

∆P y = ∆Ps-HRS - ∆Pclass

∆Ps-HRS = HRS pressure drop (0 if no HRS or subgroup 2 or 3) [Pa]*

∆Pclass = value from Table 2 [Pa] (0 if subgroup 2 or 3)

Pressure correction due to HRS efficiency; Δpz

∆Pz = (ηclass - ηs + 5 * cfheater) *

( 1-
mr
100 ( * fpe

ηs = HRS dry efficiency winter [%] (0 if no HRS or subgroup 2 or 3)

η class = value from Table 2 [%] (0 if subgroup 2 or 3)*
mr = mixing ratio, winter (recirculation air / supply air; maximum), allowed range 0 to 85 [%]
f pe = pressure – efficiency factor
= (- 0.0035 * t ODA - 0.79) x t ODA + 8.1 [Pa / % ]
t ODA = design outdoor temperature, winter [°C]
cf heater = correction for electrical heater (reheater, i.e. heater downstream the HRS).
= 0 when there is no electrical heater
= 1 when there is an electrical heater
* (Eğer HRS bilgisi yoksa veya altgrup 2 veya 3 ise 0 alınacaktır)

Fan reference power

[∆P s-static - (∆P x + ∆P y + ∆P z)] * q v-s

Pairside−ref =
a * In (Pairside−ref ) - b + NG ref

Pair side-ref = fan reference power [kW] (use Psup–ref for supply air side Pext–ref or extract air side)
q v-s = air volume flow rate [m 3/s]
NG ref = Fan Efficiency Grade corresponding to the class value (see Table 2)
a,b = coefficients as per Table 3 below.

Pair side-ref a b
≤ 10 kW 4.56 10.5
> 10 kW 1.1 2.6

Absorbed power factor; f s-Pref

The values from the calculations made in the previous steps are used in the following formula. If the result is less than or equal
to 1, the unit meets the requirements of the accepted energy class, otherwise the same procedure must be repeated by
adopting a lower subclass.

Ps-bes + Ps-emş
fs-Pref = ≤1
Pbes-ref + Pemş-ref
fs-Pref = absorbed power factor
Ps-sup = active power supplied from the mains, including any motor control equipment, to selected supply air fan [kW]
Ps-ext = active power supplied from the mains, including any motor control equipment, to selected extract air fan [kW]
Psup-ref = supply air fan reference power [kW]
Pext-ref = extract air fan reference power [kW]

12
VDI 6022

Sealing materials in air-handling areas shall be

closed-pored; they shall not absorb any humidity or
release any odours and, in particular, must not provide
a nutrient substrate for microorganisms.

In order to avoid microbiological growth, it must be

ensured that the relative humidity is not higher than
80% in areas where filters and silencers are present.
Humidifiers must not be placed in front of silencers or
filters.

The materials, the design of surfaces and geometrical

shaping of the system components shall be such as
to prevent the adhesion and depositing of
contaminations.

All components must be accessible for the purposes

of the required inspection and cleaning work

Ensure that there are no humid areas in the humidifier

and cooler outlets during shut downs longer than 48
hours. For this purpose, humidifiers and coolers must
be switched off beforehand and dry air should
circulate through the system (gradual shut down).

Units with an inside height of 1.3 m and above are

required to have a monitoring glass for all humidifiers,
fans and air filters. In addition to this lighting inside is
recommended.

As a matter of principle, only such air filters shall be

used for air filtration in ventilating and air-conditioning
systems and in air-handling units, which have been
tested in accordance with EN 779 or EN 1822, and
which are labelled individually

The drain pan must be made of corrosion-resistant

material inclined from each side. The drain line should
not be connected directly to the waste water line.

Air filters should be replaced from dust-filled side.

Filters should not be flat on the unit floor. The pouches
of the bag filters should always be placed in vertical
position.

Independent of other indicators; Each filter stage of

the air handling units in which the volumetric air flow is
more than 1000 m³ / h must be fitted with a differential
pressure gauge in the correct operating range to
instantly show the pressure losses of the air filters.

If a belt driven fan is used (except flat belts) a filter

stage should be added after the fan.

A E R A A I R I N N O V A T I O N 13
 STANDARTLAR

EN 13053: Ventilation for buildings - Air handling units - Rating and performance for units, components and sections

The performance tests of air handling units and components and the classification of velocity, total power consumption
and system energy efficiency in the unit are made according to EN 13053 standard.

CLASSES OF AVERAGE AIR VELOCITY LEVELS INSIDE THE CASING

CLASS AIR VELOCITY (m/s)

V1 ≤ 1.6

V2 > 1.6 to 1.8

V3 > 1.8 to 2.0

Note: The air velocity in the unit has a large influence on
V4 > 2.0 to 2.2 energy consumption. The velocities are calculated for air
velocity in AHU cross-section. The velocity is based on the
V5 > 2.2 to 2.5 square area of filter section of a unit, or if no filter is installed it
is based on the square area of the fan section.
V6 > 2.5 to 2.8

V7 > 2.8 to 3.2

V8 > 3.2 to 3.6

V9 > 3.6

CLASSES OF POWER INPUT OF DRIVES (FANS)

CLASS Pm maximum (kW)

The electrical power consumption depends on the air flow of
the fan and the increase in static pressure. Pressure losses in
P1 ≤ Pm ref x 0.85
the fan housing and on the diffuser plate are not regarded as
static pressure increases, but as fan losses separately.
P2 ≤ Pm ref x 0.90

P3 ≤ Pm ref x 0.95

( (
∆Pstat 0.925 0.95
P4 ≤ Pm ref x 1.00 Pm ref = * (qv + 0.8)
450
P5 ≤ Pm ref x 1.06
P m ref [kW] reference power input
∆P stat [Pa] sstatic pressure at the fan section
P6 ≤ Pm ref x 1.12
qv [m 3/s] air flow
P7 > Pm ref x 1.12

HEAT RECOVERY CLASSES

CLASS Energy efficiency η

H1 ≤ 71
e1:1
ηe = ηt x
( 1-
1
ε (
η e [%] Energy Efficiency
H2 ≤ 64 η t [%] Thermal efficiency under dry conditions
ε [-] Performance Coefficient
H3 ≤ 55
If supply air and exhaust air flows are not equal and no
H4 ≤ 45 information is available on efficiency, the efficiency is
calculated using the following empirical formula.
H5 ≤ 36

( (
Exhaust air flow 0.4
ηt = ηt 1:1 x
H6 - Fresh air flow

The filter pressure losses during design should be calculated by taking the arithmetic mean of the initial and final pressure
losses. The final pressure drops according to the filter classes are indicated in the standard with the following values.

G1 - G4: 150 Pa
M5 - F7: 200 Pa
F8 - F9: 300 Pa

14
CLIMATIC TEST CHAMBER

The air handling units produced in our company are tested and certified by independent organizations and also subjected
to tests in the AERA-ANEMO laboratory in order to carry out the design verification procedures.
The ANEMO laboratory, which is designed in accordance with the European Norms and Directives used, carries out tests
according to the following criteria;

• EN 308 Heat exchangers-Test methods for determining the performance of heat recovery devices from air to air and
waste gases
• EN 1886 Ventilation for Buildings - Air Handling Units - Mechanical Performance
• EN 13053 "Air handling units - Classification and performance for devices, components and cells"
• EN 13779 "Performance requirements for ventilation and room conditioning systems"
• European Union Energy Commission (EU) No 1253/2014 "ECO-DESIGN requirements for ventilation equipment"
• EN 305 "Performance specifications for heat exchangers and test procedures for performance measurement"
• ISO 5167-4: 2003 "Flow measurement with differential pressure measurement devices placed in circular cross-section
pipes - Part 4: Venturi pipes"

For air performance tests, two sealed and isolated volumes are used for indoor and outdoor conditions. The thermal
efficiency and capacity tests of air handling units and air performance tests can be carried out in 5200 m3 / h air flow and
-20°C outside and +37°C indoor conditions.

Precision measurement equipment and data acquisition software are used for determining the thermal and mechanical
performance of the unit such as efficiency, thermal bridging, thermal transmittence and air leakage.

AIRFLOW AIRFLOW
MEASUREMENT MEASUREMENT
STATION STATION
AIR CONDITIONER

AIRFLOW
MEASUREMENT
STATION

AIRFLOW
MEASUREMENT
STATION

AIR CONDITIONER

HUMIDIFIER

All of the equipment used during the test is periodically checked and calibrated by the accredited institutions. The main
test and auxiliary equipment found in the ANEMO laboratory;

Sensors (Temperature, relative humidity, differential pressure)

Venturi tube
Energy analyzer
Data acquisition device and software
Leak test system
Sound measuring station
Air conditioning system

A E R A A I R I N N O V A T I O N 15
 SELECTION SOFTWARE

Selection Software developed by our company is used

to provide the supply air conditions and component
requirements determined in the projects. The sections
containing all the components that may be present in the
air handling units are defined in the selection software and
are designed according to the configuration desired in the
project.

The selection software is web-based, this makes it

possible to access it from anywhere with a username and
password. Previously made selections are stored in the
user specific database, the old projects can be examined
and reproduced and used for new projects, if desired, can
be sent to another user.

ADVANTAGES OF AERA SELECT

The calculations for heating, cooling, humidification

/ dehumidification, sound attenuation, heat recovery,
suction or blowing, filtering and air mixing are automatically
made with user inputs, the necessary components are
selected and the performance values ​​of the EVO Modular
Air Handling Units with the details are presented with a
report to the user.

After creating the required configuration from the AERA

Selection software, the user can obtain performance
values ​​at the new operating points of the unit by simulating
the increase / decrease of the external pressure or the
air flow by simulating how the device will work at another
operating point.

The physical constraints at the installation site can be

defined by selecting the appropriate unit before installation
by configuring the program before manufacturing.

AERA Selection Software contains measures against

user-induced selection or configuration errors.

In addition to the classic belt driven fans, there are also

external motor plug fans and direct drive EC plug fans can
be selected from the software. EC Plug fans can be easily
installed in the Fan Array application, which significantly
reduces the unit size, reduces noise levels and simplifies
service.

The selection reports are prepared according to

Eurovent criteria and contain all necessary information
including energy class. ECO-DESIGN calculations, which
have become an important criterion in determining the
performance of the device today, are also performed
for the selected device, and the values ​​and conformity
reached are indicated on the report.

It has a simple and plain interface that can be easily

learned, different units in the project are selected quickly
and their technical and price information are
​​ reported.

In addition to the performance values ​​of EVO Modular

Air Handling Units, price information ​​are also extracted as
proforma invoice from the selection software.

The detailed technical drawings of the EVO Modular

Air Handling Unit selected according to the needs of the
project are provided in DXF format.

16
Components such as coils, exchangers, etc. may cause
prolonged delivery times of air handling units. As a part of
AERA's rapid delivery policy, such components are kept
in stock at the capacity values used frequently. In the
selection software, the components with stock are shown
to the user. If the unit configuration is formed with these
components, the selected EVO Modular Air Handling Unit
is produced with quick delivery option.

A E R A A I R I N N O V A T I O N 17
 CASING DESIGN

EVO Modular Air Handling Unit's casings are engineered with today's standards, according to future needs. By eliminating
the defects of traditional casings, high thermal and acoustical performance have been achieved, mechanical strength
and corrosion resistance have been increased. As a result, a compact body that provides easy operation and service has
emerged.

Performance values were calculated prior to the actual product testing, using modern engineering methods developed by
3D computerized design and analysis during design stage. Subsequently, these values were verified with tests made in
accordance with relevant standards in our modern testing laboratory.

LOW THERMAL BRIDGING DESIGN

PVC Frame

In EVO Modular Air Handling Units, unique panels with

high thermal and air leakage resistance are used in fixed
panels and service panels. Continuity is provided in the
seals by special corner joining method.

The panels to prevent the formation of thermal bridging are made up of sheet metals and sealing gaskets that are fixed on
a specially designed PVC frame. Since the inner and outer panel sheets are not connected, thermal bridging from metal
surfaces is prevented.

With the help of the PVC frame used, continuous and homogeneous insulation was obtained on the panels. With this
structure on the sides of the panel, the thickness remain the same for each surface. The air gap in the PVC profile increases
the thermal resistance of the profile and reduces the total heat transfer coefficient.

Unit Components

The components that may cause thermal bridging due to the connection between the inner and outer air flow in the central
body are locks and hinges and similar connection components. This connection is evaded by connecting all components
externally and a seamless insulation is provided on the casing.

PANEL

Unit's panels are made of sheet coated with high

corrosion resistant stainless steel. The outer surface is
made of polyester painted sheet as the standard, the inner
surface and the sheets used for fixing the components
are made of Aluminium and Zinc coated AZ 150 quality
Aluzinc sheet. Both types of steel have been performing
very well in the salt vapor test with the aim of measuring
the corrosion resistance and have also been applied in
harsh environments.

DRAIN PAN

In EVO Modular air handling units, cooling coils, plate

heat recovery exchanger and humidifier cells are
equipped with a drain pan made of stainless steel, which
is bi-directionally sloped and sealed. The drain pan and
skid components are designed in accordance with VDI
6022 standard and have fast drainage and easy to clean
structure.

In units where the drain pan is used, one ball siphon is

provided as standard with each drain pan. The siphon is
designed for both situations where the cell is at a negative
or positive pressure. In order to facilitate drainage
according to the pressure on the cell, it is desirable to
have a certain height between the drainage outlet and
the waste water connection, which is indicated on the
respective cell label.The desired height can be achieved Optional
with the help of the adjustable feet. electric heater

18
EASE OF INSTALLATION

Adjustable Feet

Planar disturbances at the installation site result in the fact that the central covers can not be fully opened or closed, a gap
is formed around the panels, leakage occurs, internal components are damaged and service difficulties occur. To prevent
this, the EVO Modular Air Handling Units are designed with adjustable feet to ensure that the unit is parallel to the ground
plane. Adjustable feet also help maintain the minimum drainage height from the drain pan.

Filter Frame

The filters in the unit are serviced by removing the service covers from the front of the unit as standard. In the applications
up to the EVOXX20 model where the space is limited, the filters can be slidable and service can be done from the front.
This allows a shortening of up to 600 mm in length of the device.

Module Connectors

In EVO Modular Air Handling Units, sections are grouped so that the total length does not exceed 2500 mm. If the total
length exceeds 2500 mm, the unit is divided into modules so that the length of each module does not exceed 2500 mm
and the modules are joined on site. Air leakage may occur due to improper mounting during the assembly of modules, which
affects performance. EVO Modular Air Handling Units have specially designed connecting plates and module connectors
with 3 dimensional planes so that the module connections can be done easily and accurately.

Outdoor Protection

EVO Modular Air Handling Units are designed to operate under atmospheric conditions. In AERA Selection software,
the electrical components of the device are revised after entering the information that the device will work in the external
environment and a roof plate is applied to the unit against rain and snow accumulation. It is recommended that the
roofing plate be sloped to prevent snow accumulation in areas where snowfall is intense. Roof plate is manufactured from
polyester coated sheet with high corrosion resistance.

Adjustable Hinges and Locks

The lock and hinge mechanisms used in the units can be adjusted to ± 3 mm on all three axes. Axis problems caused by
the mounting location, etc., are resolved as a standard feature in all devices.

A E R A A I R I N N O V A T I O N 19
 COMPONENTS

FILTERS

In EVO Modular Air Handling Units, pre-filters, middle-class filters and fine class filters are used according to particulate
holding characteristics. Filters are produced as cassette, compact and bag type and selected the software according to
the specification of the project. Depending on demand, Active Carbon filters can also be applied to retain odor and other
chemical particles.

Filters are components that determine the pressure drop in air handling units to a significant extent. AERA selection software
considers fan calculations by taking the average of the initial and final pressure drops of the filters during fan selection in
line with Eurovent criteria.

Size and Filter Classes of Some Particles in the Air

The filter class should be selected according to the size and type of particles desired to be held. The following table shows
the particle sizes that are frequently seen in air conditioning systems and the recommended filter type to use.

ULTRA FINE FILTER FINE FILTER ROUGH FILTERS

FILTER TYPE

HEPA FILTERS
MIDDLE CLASS FILTER

ACTIVE CARBON CYCLON SEPARATORS

STEAM
AIR POLLUTING PARTICLES
PARTICLE SIZE

SMALL PARTICLES BIG PARTICLES

VIRUS
BACTERIA POLEN
RAIN DROP
SMOKE AND FUMES
FOG
CIGARETTE SMOKE ASH
MACRO MOLECULE
OIL VAPOR

μm 0.01 0,1 1 10 100 1000

0,001

In order to monitor filter pollution and service times, pressure gauges can be installed on the unit. U manometers or
differential pressure gauges show instantaneous readings, they can also inform the building automation system with a filter
alarm if desired.

U MANOMETER DIFFERENTIAL PRESSURE TRANSMITTER DIFFERENTIAL PRESSURE GAUGE

20
ROTOR

EVO Modular Air Handling Units are manufactured using

new materials and manufacturing technologies. Thanks
to high technology, heat transfer efficiencies reach 85%
in heating and cooling seasons. The stepping motor
used as a rotor drive is suitable for automation and it
provides optimum energy gain by changing the number of
revolutions according to the heating and cooling needs.
The stepper motor used provides up to 55% energy
savings over conventional AC motors.

The part where the rotor rotates and the heat is transferred
is called the matrix and it is formed by wrapping the high
strength aluminum sheets with each other by giving a
curly form.

As well height (gap between wraps) increases, the amount of heat transfer and pressure drop is reduced. The decrease in
well height increases the transfer of heat and pressure drop. In EVO Modular Air Handling Units, condensing type rotors with
a 1.6 mm well height are used as standard. For higher heat transfer requirements, rotors with 1.8 mm, 2.0 mm or 2.5 mm
well height can be selected from the selection software for 1.4 mm can be chosen for lower pressure drop requirements.

Rotors are produced in three different types by changing the matrix material used to meet different moisture transfer needs

CONDENSING Aluminum material

ENTHALPY Silica gel coated aluminum material
SORPTION Zeolite coated aluminum material

The table below shows the heat and moisture transfer efficiencies of these three materials at different blwell heights.

CONDENSING TYPE ENTHALPIC TYPE SORPTION TYPE

% 90
% 80
% 70
% 60
% 50
% 40
% 30
% 20
% 10
%0
1.4

1.5

1.6

1.7

1.8

1.9

1.4

1.5

1.6

1.7

1.8

1.9

1.4

1.5

1.6

1.7

1.8

1.9

WINTER HEAT TRANSFER EFFICIENCY

SUMMER HEAT TRANSFER EFFICIENCY
MOISTURE TRANSFER EFFICIENCY

A E R A A I R I N N O V A T I O N 21
 COMPONENTS

Condensing rotors are used in applications where moisture transfer is usually MOLECULAR STRUCTURE
required during winter months and in summer where moisture transfer is not OF THE COATING MATERIAL
required. Moisture transfer to supply air takes place in the winter when extracted
air condensates, whereas moisture transfer does not happen in summer because
the possibility of condensation is very low. The smell and the chemical particles
of the condensing air are transferred to supply air together with moisture. For
this reason, it is not recommended to use condensing rotors in applications
where there are smell and chemical particles in the exhausted air. 3Å H H
O
Enthalpy rotors are made by coating Silicagel over aluminum surface which
enables moisture transfer. Silicagel absorbs humidity in the air and transfers it
to the other air flow. Silicagel also allows the transfer of water-soluble molecules
between air flows. It is not recommended to use it in applications where chemical WATER MOLECULE 2.8Å
particles are present in the exhaust air.

Sorption rotors are the result of the coating of Zeolite and such derivatized
materials, which allows very high moisture transfer to the aluminum surface.
Since water molecules can penetrate into the coating material, high moisture
transfer occurs. The interspace between the molecules of the coating material
allows only the passage of water molecules, blocking the passage of chemical
substances such as odor.

In summer and winter conditions, heat transfer efficiencies similar to other

materials are obtained, while moisture transfer efficiencies in sorption rotors
reach 82%. This also plays an important role in reducing the latent heat load
due to high fresh air in applications where especially the cooling load is high.

AIR FLOW AND AIR TIGHTNESS

In EVO modular air handling unit selection, rotors are always designed to COUNTER FLOW
provide counter air flow. There is a loss of 35% in the heat and moisture transfer WORKING PRINCIPLE
efficiencies when no counter flow is generated in the rotor.

Sealing Gaskets

Due to the structure of the rotor there is air leakage between inside and outside
of two surfaces. Gaskets previously used was able to reduce air leakage just
under 3%. Evo Modular Air Handling unit's special sealing gaskets can reduce
the air leakage under 1%.

SPECIAL GASKET

AIR TIGHT AIR LEAKAGE

% 100
%0

Evo Modular Air Handling Unit's Special

gaskets reduce air leakage under 1%

STANDART GASKET

AIR TIGHT AIR LEAKAGE

% 100
%0

22
By selecting the configuration as
EXHAUST STATIC
shown in the figure in EVO Modular AIR PRESSURE
Air Handling Units, the static
SUPPLY
pressure values between the two OUTDOOR
AIR AIR
air flows on the rotor will be very
close to each other, so the leakage
+
between the flows will be minimized. 0
It is advisable to configure the units
this way in modular air handling units
just like compact units.
STATIC
PRESSURE
-
SUPPLY AIR

SUPPLY AIR

PURGE SECTOR

In EVO Modular Air Handling Units,

the rotors are equipped with a
special Purge section in addition to
OUTSIDE AIR
special gaskets used to prevent the
exhaust air from mixing into fresh
air. The purge section is located
between the two airflows, outside EXHAUST AIR
air is taken into purge section and
this prevents exhaust air to be mixed TURNING DIRECTION
with fresh air.

A E R A A I R I N N O V A T I O N 23
 COMPONENTS

SUPPLY AIR

In EVO Modular Air Handling Units, in order to provide

heat transfer between hot or cold fluid and air quickly
and efficiently, coils with copper tube / aluminum fin
configuration are used. Two different coil geometries
can be selected according to capacity requirement
from selection software. The fins have a special form for
increasing the heat transfer surface, reducing the risk
HEATING COIL
of freezing and preventing the condensed water mixing
with the air. Coil collectors are made of steel as standard,
copper collectors may be used if required. In the coils
there is an air purger and a water outlet as standard. The
capacity of the coils is tested and approved at Eurovent
laboratories.

Heating Coils

The heating coils are used as a preheater at the air

handling unit inlet of fresh air and as a after heater to bring
the supply air to the design temperature or to bring the
dehumidified air to desired supply temperature. Water,
water / anti-freeze mixture or refrigerant can be used as
the fluid.

Frost Protection
L
COI
Frost protection independent of the control system in the ING
heating coils is provided upon request. In a system with L
O
CO

a set temperature of 0-15ºC, when the water temperature

falls below the set temperature, the alarm signal is activated
and 24V and 230V relays are tripped, the proportional
output on the frost protection sends signal to open the
2/3 way valve fully open.

Cooling Coils

Cooling Coils are used to bring supply air to the

design temperature or to dehumdify the air into design
absolute humidity levels. Water or refrigerant can
be used as the fluid. Coils using refrigerant can be
designed with multiple inputs and outputs to work with
multiple outdoor units. Coils designed with multiple
input-output batteries, each circuit is designed with
cross circuitry to allow the circulating refrigerant to
pass through the entire surface of the battery.

24
For removing the condensate formed in the cooling coils from the system, drain pans manufactured from stainless steel are
used as standard.Drain pans are by welding and manufactured with double curved design to speed up the release of the
condensate water. A ball siphon is supplied as standard with each machine against the transfer of chemical particles such
as odor.

Optional
electric heater

10
HUMIDIFIERS 10
0
5

95
90 30
Humidifiers are used to increase the humidity of indoor air, 85

SPECIFIC HUMIDITY RATIO - gr NEM / kg KURU HAVA

especially in applications where outside air is cold and and 80
75

g
fresh air is heated by internal heaters. The capacity and

/k
70

kJ
model of the humidifier are determined in the Selection 65 25

Y-
ALP
60

NEMLENDİRME
software according to the desired air conditions and are

TH
55

HU Y C
reflected in the report together with all the selection criteria
EN

O
Y C
50

TI
M OO
B

IT FI
RA
ID L

ID CI
IF IN

M PE
45 20
of the humidifier.

YI G

HU S
NG
40 COOLING HEATING
35

DE BY
IN ING
30

DEHUMIDIFYING
HU HE
OL FY
G
20

M AT
CO IDI
25

ID IN
15

BY UM

IF G
YI
H
10

NG
DE
10
5
0
-5
-1
0 0
-1
5
-10
-40
-20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60
KURU TERMOMETRE SICAKLIĞI - °C

Isothermal Humidifiers

In EVO Modular Air Handling Units, External Steam type

using ready steam, Electrode type which obtains steam
by vaporizing the softened water from the water treatment
systems with the aid of its electrodes, and Resistance
type steam humidifiers which obtain steam by using
regular water can be used.

External Steam Type Humidifiers (FSH)

It is used when steam is supplied from a steam source in

plant. The steam distributors are made of from stainless
steel and special designed live steam jacket ensures
any drops formed by condensation are immediately
evaporated.The steam penetration distances start at 300
mm, depending on the entrance humidity and the desired
moisture levels.

A E R A A I R I N N O V A T I O N 25
 COMPONENTS

Electrode Type Humidifiers (ELD)

Temperature of the water brought to running conditions is increased in a cylinder

containing the electrodes made of stainless material and steam is obtained.
Electrode surfaces have a special design to increase their service life and ensure
proper heat dissipation.Suitable for use in hygienic applications, the humidifier
has VDE, GS and CE certificates. The special cleaning system ensures the
removal of sediments and other particles in the cylinder and increases the
service life. They can meet the need for humidification up to 464 kg / h with
modular construction.

Resistance Type Moisturizers (RZT)

Drinable water taken from the tap is increased in temperature inside a detachable
type cylinder with built-in immersion type resistance and steam is produced.
The cylinder, made of plastic, is equipped with high temperature protection and
level control element to prevent the resistances from running with incomplete
water. The cylinder can easily be removed and cleaned. With the effective
microprocessor control on it, the desired humidity value can be achieved with
high accuracy (± 1%). Suitable for use in hygienic applications, the humidifier has
VDE, GS and CE certificates. The special cleaning system ensures the removal
of sediments and other particles in the cylinder and increases the service life.

Adiabatic Humidifiers

Adiabatic humidifiers are used in the HEF2E series for adiabatic cooling or
humidification in EVO Modular Air Handling Units. They have low energy
consumption and manufactured with the VDI 6022 hygiene certificate. The
system is designed to have high efficiency and low pressure drop, it has a
flame retardant glass fiber humidifier pad, circulation pump, flow balancing
valves, droplet eliminators and level sensors. Optionally step controlled, simple
or advanced automation and ultraviolet lamp sterilization system can be installed
with the humidifier.

26
FANS

In EVO Modular Air Handling Units, different types of fans can be selected according to required flow rate and static
pressure requirements of the project and the variability of these needs. Depending on the requirements of the users, plug
type fans with direct coupling motors or EC motors, forward inclined or backward inclined belt and pulley connected fans
can be used. Fan-array applications which reduces the sound pressure of the project and reduces the size of the unit can
also be selected.

Forward Inclined Fans

These fans are mostly used in cost-oriented low/medium static pressure

applications and they belong to medium efficiency class. Fresh air units and
aspirators that does not require cleaning are their common area of application.
It is not advised to use them where system static pressure may differ a lot from
the design conditions.

Backward Curved Fans

Backward inclined fans are used in medium/high static pressure applications

and they belong to high efficiency class. Aspirators, fresh air units, air handling
units with recirculation and heat recovery air handling units are their frequent
used applications. Due to the nature of the operating and performance curves
they are suitable for variable flow and variable pressure applications and speed
control.

Plug type fans

These fans are used in medium/high static pressure applications and they
belong to high efficiency class. Since the fan and motor are directly coupled
to each other, the losses in the belt / pulley system are eliminated. The plug
type fans must be driven with a frequency converter in order to run them at
the design conditions and to set the speed. The wing structure is an aerofoil
structure to enhance aerodynamic efficiency. They can be used in all aspirators,
including applications where the air should not be in touch with the motor, fresh
air handling units, units with recirculation, heat recovery ventilators and hygienic
air handling units.

Plug fans with EC motors

It is used in applications where medium / high static pressure is needed. These

fans have IE4 very high efficiency class electronically controlled motors. The
blade structure is an aerofoil structure to enhance aerodynamic efficiency. Plug
type fans with EC motors are integrated to selection software and technical
report on operating conditions is also specified.

A E R A A I R I N N O V A T I O N 27
 COMPONENTS

All EC motor plug type fans used in EVO Modular Air Handling Units are in
compliance with European Union Energy Norm (ERP) with very high efficiency.
They have electronic components for easy operation according to many control
systems (Constant Air Volume CAV, Constant Static Pressure / Variable Air
Volume, VAV)

All EC Motor Plug Fans used in EVO Modular Air Handling Units have MODBUS
communication protocol, control signals and alarm information can be transferred
to the main control panel just with a dual cable.

In addition to high energy efficiencies, the compact design and space-saving

EC Motor driven Plug fans can be used as a fan array in bigger airflows to meet
the need in a very small area. Selection software can automatically select up to
6 fans for the fan array. This application not only creates a compact structure,
but also a continuity of operation in case of a failure or maintenance times.

Fan Laws

The speed, power and pressure interactions in the fans used in the EVO Modular Air Handling Units are predictable and
explained in the fan laws. Using these laws and the change in the fan rpm, it is possible to obtain an estimate of what the
pressure and power values will be at the new working point.

FLOW SPEED PRESSURE (SPEED)2 POWER (SPEED)3

% 100 % 100 % 100

PRESSURE

POWER
FLOW

0 % 100 0 % 100 0 % 100

SPEED SPEED SPEED

( ( ( (
Q1 N SP1 N1 2 P1 N1 3

= 1 = =
Q2 N2 SP2 N2 P2 N2

Reducing the RPM by 10% decreases the Reducing the RPM by 10% decreases the
Varying the RPM by 10% decrases or static pressure by 19% and an increase in power tequirement by 27% and an increase
increases air delivery by 10%. RPM by 10% increases the static pressure in RPM by 10% increases the power require-
by 21% ment by 33%

Q - Flow, SP - Pressure, P - Power (kW) ve N - Speed (RPM)

28
MIXING CHAMBER

In EVO Modular Air Handling Units, mixing chambers

are designed with the purpose of mixing fresh air with
return air coming from indoors before supplying it back
indoors. Mixing chambers are often used with the aim of
meeting the need for fresh air supply in applications where
direct ventilation of the kitchen / toilet ventilation systems
is required, or when the air conditioning unit is used to
pressurize premises.

AERA Selection software automatically calculates the

mixture air conditions according to the user's specified
mixture air flow and weather conditions in case of selecting
mixing chamber. This information is supplied to other
components such as filters, coils, fan etc. automatically, FRESH AIR
eliminating the need for manual calculation by user.
MIXING AIR
RETURN AIR

ECONOMISER

In the EVO Modular Air Handling Units, the economizer

section is designed to be used with a return fan for the
purpose of providing specified amount of fresh air indoors.
It is possible to increase the fresh air ratio to provide
optimum mixing air using the control system. Using
conomizer cell it is possible to keep the indoors under
negative or positive pressure.

For air flow adjustment, a resistance is created in the

economizer damper and the return air / fresh air ratio
in the mixing air is adjusted according to the pressure
drop created.The AERA Selection software automatically
calculates the mixture air conditions according to the FRESH AIR
outside air conditions and mixing rations specified by
the user when the economizer section is selected. This MIXING AIR
information is automatically transferred to next section RETURN AIR
such as filter, battery, fan etc.

A E R A A I R I N N O V A T I O N 29
 COMPONENTS

SOUND ATTENUATOR Pod width (B) = 200 / Pod length (S) = 100 mm

Pressure
EVO Modular Air Handling Units have a silent design

value
Damping [dB] for medium frequency [Hz]

Length
thanks to low velocity criteria in construction and

mm
component selection that prevent turbulence in casign
design. In cases where the units are located adjacent to 63 125 250 500 1K 2K 4K 8K ξ
living volumes, where it is desired that the sound of unit 500 3 5 10 19 24 20 15 11 5.7
has to be even lower, sound attenuators can be used. 1000 5 8 15 33 44 36 23 15 6.6
1500 7 12 21 46 50 50 32 19 7.5
Silencers can be installed in the units or in the air ducts
2000 9 16 27 50 50 50 40 23 8.5
when space is limited. The silencers located in the unit
2500 11 20 33 50 50 50 49 27 9.4
have higher sound damping characteristics and lower
sound pressure levels than the silencers in the air duct Dp pressure loss is calculated from the pressure value.
(Vs≤6.0 m / s) due to low velocities (Vs≤2.0 m / s) ∆p = 0,6 x v2 x ξ
v is the speed at the cross section of the silencer.
Silencer sections are produced in 600, 1000 and 1500
mm lengths. For optimum pressure drop and sound
S
damping level, silencer pods 200 mm wide are placed
at 100 mm distance from each other. Sound absorption
level and pressure drop criteria for standard lengths are
indicated on the table. b

Flow
The sound damping values tested by ISO 7235 for
200
silencers are given in the selection software and in the
a
report output according to the selection criteria. The
silencers are designed in accordance with the hygiene
criteria of VDI 6022 and DIN 1946 (parts 1 and 2).In order
to periodically clean the silencer pods, appropriate service
panels are designed on the unit casing and the pods are
designed to be easily removable.

Silencers used in EVO modular air handling units are

pods created by placing blocks of rock wool which has
A1 fire class rating according to EN 13501 in a frame
made of sheet metal. The rock wool is assembled with
a special sheath to prevent the parts from escaping into
the air stream. Sheet frame has aerodynamic design
with rounded air inlets and outlets in order to reduce the
pressure drops and turbulence.

30
ELECTRICAL HEATER

EVO Electric Heater Section is designed as a preheater in

very cold climates where electrical resistance is used as
a heat source in modular air handling units or as a after
heater / reheater in applications where there is no other
heat source. In addition to comfort applications, electrical
heaters are used in applications where the temperature is
to be controlled sensitively and the response times should
be short.

Electric heaters are equipped with 2 types of overheat

safety thermostat as standard. One of the thermostats
automatically cuts off the energy supply when it reaches
the temperature set in the factory and automatically
restarts when the ambient temperature drops. The other
thermostat is set at a higher temperature (110 °C) and
cuts off the energy when the temperature reaches the
set value, and requires manual intervention by technical
personnel after checking the cause of overheating.

In EVO Modular Air Handling Units, the heater face velocity

is 3 ~ 3.5 m / s in order to provide optimum surface
temperature / pressure drop values in the electric heaters.
In AERA selection software, electric heater sections are
automatically designed according to the capacity and air
flow required in applications.

Electric heaters are manufactured in accordance with step

control. In models with three phases, electric heaters are
designed with equal load to each phase. They are shipped
with electric panels ready for capacity control.

Depending on the application in the project, a step or

proportional kit is available as an option. These kits can
be configured with external on / off or proportional signal
which automatically changes the electric heater capacity.
If the electric heater is used as frost protection in very cold
climates, the electric heater can be controlled with the
optional Frost Protection Control kit.

A E R A A I R I N N O V A T I O N 31
 ADVANCED CONTROL SYSTEMS

HEATERS

Electrical Heaters
Electrical heaters are used for purposes such as increasing supply air temperature, preheating fresh air from the outside,
bringing the supply air to the desired temperature after dehumidification process. With SENSO PLUS control, electric
heaters are driven in steps or proportional manner according to desired set temperature to save energy. All safety and
operating equipment required by the electric heater is supplied standard with the SENSO PLUS control.

Heating Coil
Heating coils are used for increasing the supply air temperature and for bringing the supply air to the desired temperature
after dehumidifying process. Hot water coils can be driven by proportional control via 2 or 3 way valves. With the SENSO
PLUS control, frost protection mechanism is available as standard to prevent the temperature of the supply water from
reaching freezing conditions in extreme cold climates. If the return water temperature falls below a certain value set on the
control, the heating valve is switched to the 100% open position and a run signal is sent to the heating water circulation
pump. If the temperature still does not rise to the desired value, the device is stopped and the user is given a freeze alarm.

DX (Condensing) Coil
They are used for increasing the supply air temperature and for bringing the supply air to the desired temperature
after dehumidifying process. They can be step controlled with on/off method, maximum 16 step settings are available.

COOLERS

Cooling Coil
Cooling coils are used to lower the supply air temperature and dehumidification process. Cooling coils are controlled with
2 or 3 way valves. Run signal will be sent to cold water circulation pump when necessary.

DX (Evaporator) Coil
They are used to lower the supply air temperature and dehumidification process. They can be step controlled with on/off
method, maximum 8 step settings are available.

Changeover Coils
These coils can have cooling in the summer season and heating in the winter season. Their capacities are usually selected
according to cooling conditions. Heating and cooling capacity is controlled and has frost protection during heating season.

32
FAN

Constant Air Volume

PRESSURE [Pa]
Nominal air flow and reduced air flow are defined as
two control values. SENSO PLUS control measures the
air pressure drop in the suction ports of the fans and SYSTEM
compares the air flow with the set value to produce a CURVE
working signal for the frequency converter or EC fan.

Contamination of the filters can be controlled by static

flow control within the fan operating curve, to the static
FAN
pressure requirements of the unit which result in higher or
lower than the project values. SPEED
1000 AIR FLOW
Constant Air Pressure [m3/h]

In EVO Modular Air Handling Units, constant pressure

control is used to meet the variable airflow requirement of
the air duct system. The SENSO PLUS control generates

PRESSURE [Pa]
a working signal to frequency converter or EC Fan that
will change the fan speed by continuously measuring the SYSTEM
static pressure created in the supply air duct and CURVE
comparing it with the value defined in the system. When
a VAV damper opens or closes, higher or lower external
static pressure needs can be met with constant pressure
control within the fans operating curve. This way extreme 400
noise in the ducts, unbalanced airflow distribution in FAN
different volumes is prevented. SPEED

Indoor Air Quality Control AIR FLOW

[m3/h]
The air quality sensor or the CO2 sensor, which is
placed in the critical volume or return channel in the
interior, continuously measures the air quality. This value
generates a signal to frequency converter or EC Fan that
will change the fan speed by comparing it to the set
point on the controller. If the indoor air quality is lower than
the desired value, the fan speed and thus the fresh air
amount is increased; if the indoor air quality is higher than
the desired indoor air quality, the fan speed and fresh
air speed are decreased; Energy saving is achieved in
considerable amounts in heating or cooling loads caused
by fresh air.

A E R A A I R I N N O V A T I O N 33
 ADVANCED CONTROL SYSTEMS

FILTERS

PRESSURE [Pa]
The pressure drops of the filters used to clean the air,
can be controlled by SENSO PLUS control. Users
are notified about the filter cleaning and replacement
intervals. Pressure drop control can be made according FINAL PRESSURE DROP
to a constant pressure drop (Static) or variable air flow
300
(Dynamic). Especially with units designed with variable DYNAMIC ALARM LIMIT
speed fans, Dynamic Filter Control enables filter service STATIC ALARM LIMIT
200
at the right time. CLEAN FILTRE PRESSURE DROP

100

1000 2000 3000 AIR FLOW [m3/h]

HEAT EXCHANGERS

PLATE TYPE HEAT EXCHANGER CONTROL

In EVO Modular Air Handling Units with plate type heat exchangers, there is a by-pass damper in order to be able to deliver
the outside air directly into the exchanger without entering the heat exchanger under suitable weather conditions. The
SENSO PLUS control uses temperature sensors to determine when the by-pass will be turned on and off. This function,
also known as Free Cooling, saves energy by opening the by-pass dampers when the outside air is suitable.

In extreme cold climates fresh air preheater can be used to prevent the air condensation on the plated type heat exchanger
from freezing and damaging the heat exchanger. If this is not enough, by-pass damper is opened to prevent the cold air
from passing over the heat exchanger. In such applications, referred to as heat exchanger frost protection, an afterheater
must be built in the device and this heater must be chosen to meet the necessary supply air conditions.

Rotary Type Heat Exchanger

In EVO Modular Air Handling Units, when the SENSO PLUS control is used together with the rotary exchanger, the unit is
shipped with a variable speed rotor drive. By controlling the supply air temperature, the rotor revolutions are automatically
adjusted according to the required heat recovery. If the outside air conditions are appropriate, the rotor is stopped and
free cooling is performed.

DAMPERS

In EVO Modular Air Handling Units, if the SENSO PLUS control is used, the Economizer and Mixer dampers are automatically
adjusted according to the desired mixture air conditions and the amount of fresh air. The recirculation dampers, which
allow the use of variable indoor / fresh air, are also automatically adjusted according to desired supply air temperature.

HUMIDITY CONTROL EQUIPMENT

Humidity control equipments are used to raise or lower the humidity of the supply air. With the SENSO PLUS control, the
humidifier / de-humidifiers can be controlled to bring the supply air to the desired humidity value.

The SENSO PLUS control also provides system control besides equipment control, which means that the devices can
be operated with the Yearly Timer Function according to the working periods: Daily, Weekly, Monthly or Yearly. In the
Timer Function, values such as weekly working days, vacation times, daylight savings time can be defined and reported
retrospectively.

Besides, the Support Function which is used to prevent the undesired conditions from occurring indoors even when the
device is not working. The indoor temperature from falling below or exceeding a certain value even during non-working
hours is ensured.

34
COMMUNICATION OPTIONS

SENSO PLUS control supports all of the universal

communication protocols and interacts with other air
handling units as well as with other building automation
systems.ModBUS, BACnet and EXOline protocols are
open as standard and there is also possibility to connect
with LONWORKS protocol as an option.

USER INTERFACE

With SENSO PLUS control, a standard control panel with a keypad as a user interface is delivered, optionally touch screen
user interfaces are availible as well. There is also a web server embedded in the card for monitoring and controlling the
device through a computer. Settings for the controller can be done over the server, instantaneous operating values of the
unit can be seen, as well as retroactive working values can be followed.

WEB INTERFACE (CLOUD CONTROL)

SENSO PLUS control connects the web server over the internet and allows you to view and change the settings of your
unit on any computer / tablet or mobile phone anywhere in the world. No need for complicated network settings, only a
connected network cable is enough. With this feature, it is possible to monitor and control all units from different projects
on a single screen, so that all of the operating values, active alarms, settings can be observed and remotely changed.
Cloud control is an option provided with SENSO PLUS, which is especially convenient when it is important to serve multiple
devices within seconds, in different projects all around the world.

VENTILATION MODE: NORMAL RUN

-0.3 °C

100 %

18.4 °C

100 %

24.7 °C 100 %

20.9 °C
SET TEMPERATURE: 24.0 °C

CRITICAL ALARMS: NO ALARMS

OTHER ALARMS: NO ALARMS

%100 %0

A E R A A I R I N N O V A T I O N 35
 UNIQUE ADVANTAGES OF SENSO PLUS CONTROLS

TCP / IP connection: The integrated web control console provides platform-independent remote monitoring and setting.
Tablet, PC, smartphone provides you with 24/7 accessibility to your unit.

BACNet, Modbus, EXOline, LON and CLOUDigo communication ports provide easy integration into all automation
systems.

With the modular structure, components in the unit can be added or deactivated after the installation.

It provides a quick and easy configuration program from the computer and ease of operation with plug-and-play logic.

Energy is saved;
By providing fresh air as much as the volume needed, it optimizes the air conditioning load resulting from fresh supply air.
Runs all components at their optimum points to achieve the desired supply temperature.
It optimizes the heat recovery operation according to indoor and outdoor weather conditions, provides free cooling at
appropriate temperatures.
Provides filter service by constantly observing the pressure drops over the filters and informing the user accordingly.

It provides instant information about problematic components with advanced alarm signals.

All components of the control are supplied from a single point, so they fit perfectly and work seamlessly.

The optional CLOUDigo platform; The system, which allows you to extend and is designed with maximum convenience,
is ready to use when you plug in an ethernet cable. All devices using the SENSO PLUS control system can be viewed
and controlled from a single screen.

The devices continuously send data to the system and the data are recorded. Reports on energy efficiency can be
generated by analyzing detailed data within specific dates.

CLOUDIGO

COMPUTER, PHONE OR TABLET ROUTER SENSO PLUS CONTROL

36
AERA iKLiMLENDiRME TEKNOLOJiLERi SAN. VE TiC. AŞ
SALES OFFICE Varyap Meridian, Grand Tower A Blok No:130 Ataşehir, İSTANBUL - TR aera.com.tr
TEL
+90 216 504 76 86 FAX +90 216 504 76 90
FACTORY 3. Cadde No:13 Pancar OSB, Torbalı, İzmir - TR
TEL
+90 232 799 0 111 FAX +90 232 799 01 14
R&D CENTER 3. Cadde No:13 Pancar OSB, Torbalı, İzmir - TR