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CTG BUILDING HVAC CALCULATION

R0 08-02-2010
01 27-01-2010
00 13-01-2010
Rev.

Released for Construction

Incorporating with FTI comments

Date

Description

UCS
UCS
UCS

UCS
UCS
UCS

DSGN

CHKD

APPD

Project Title:

Al Qatrana Power Project

The Hashemite Kingdom of Jordan
The Ministry of Energy and Mineral Resources
Owner :

Owners Technical advisor :

EPC Contractor :

Engineering Company:

Sub-Vendors Name:

Project No.
3480870001
Document No.

Job No.
-

Scale
-

Sheet No.
-

KP-170-28-001

Sub-Contractor Document No.:

Sub-Supplier:

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CONTENTS
Section 1
i.
ii.
iii.
Section 2
i.
ii.
Section 3
i.
Section 4
i.
ii.
Section 5
i.
Section 6
i.
ii.
iii.
Section 7
i.
ii.
iii.
iv.
v.
vi.

General Information
General Project Information
Applicable Codes, Standards and References
Calculation Method
Design Parameters
Weather Data
Indoor Criteria
HVAC Systems Designation
System Definition
Overall Heat Transfer Coefficients (U Factors)
U Value Summary
U Value Detailed Calculations
Outdoor Air Sizing
Outdoor Air Sizing
Calculation Input Data
Space Input Data
Schedule Input Data
System Input Data
Calculation Results
Results Summary
Air System Sizing Summary
Zone Sizing Summary
System Design Load Summary
Space Load Summary
Results Calculation

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SECTION 1

GENERAL INFORMATION

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i.

GENERAL PROJECT INFORMATION

ii.

: Al Qatrana Power Project

: Jordan - Qatrana
: Steam Turbine Generator

APPLICABLE CODES, STANDARDS & REFERENCES

iii.

Project
Location
Building

ASHRAE ( American Society of Heating, Refrigerating and Air Conditioning Engineers).

Jordanian National Code.

HVAC CALCULATION METHOD

Supplied air flow rate for a space is determined by the zone load requirements, any possible makeup
air needs due to direct exhaust and pressurization requirements. Outdoor air quantity of spaces
is determined as per applicable standard to maintain acceptable indoor air quality in the space.
The software programs used for load calculation are Carrier E20-II / HAP V.4.40 & Carrier E20-II / Block Load V.3.05.

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SECTION 2

DESIGN PARAMETERS

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i.

WEATHER DATA

As per 2006 ASHRAE Fundamentals Handbook design condition for Amman

Latitude

: 31.98 N

Daily Range

: 11.3 C

Outdoor Design Conditions ( Ventilation system ):

The maximum outdoor temperature considered for design of ventilation system shall be 38.9

Indoor Design Conditions ( Ventilation system ):

The temperature rise of air above the design ambient temperature : + 5 C .
Positive pressure to be maintained insides CTG building

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: 25 Pa

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DESIGN TEMPERATURE REPORT

Block Load 3.05
Location: Amman, Jordan
Prepared by: UCs

January 12, 2010

Page: 1
TABLE 1. DESIGN PARAMETERS

Latitude
Elevation
Summer Design Dry Bulb Temp
Summer Coincident Wet Bulb Temp
Daily Temperature Range
Winter Design Dry Bulb Temp
Atmospheric Clearness Number
Data Source

32.0
766.9
38.9
21.1
13.9
0.6
1.00
User Defined

Degree
m
C
C
K
C

January
TABLE 2. COOLING DESIGN TEMPERATURE PROFILES (DB/WB in C)
DB
15.8
15.1
14.4
13.8
13.4
13.3
13.5
14.2
15.5
17.3
19.4
21.7
24.0
25.6
26.7
27.2
26.7
25.8
24.2
22.4
20.6
19.1
17.7
16.6

WB
10.0
9.8
9.5
9.2
9.0
9.0
9.1
9.4
9.9
10.7
11.5
12.4
13.3
13.9
14.3
14.4
14.3
14.0
13.4
12.7
12.0
11.4
10.8
10.4

30
25

DB

Temperature

Hour
000
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
1800
1900
2000
2100
2200
2300

20
15
10

WB

5
0

0 2 4 6 8 10 12 14 16 18 20 22 24

Hour of the day

DESIGN SOLAR REPORT

Block Load 3.05
Location: Amman, Jordan
Prepared by: UCs

January 12, 2010

Page: 1

TABLE 1. DESIGN PARAMETERS

Latitude
Elevation
Summer Design Dry Bulb Temp
Summer Coincident Wet Bulb Temp
Daily Temperature Range
Winter Design Dry Bulb Temp
Atmospheric Clearness Number
Data Source

32.0
766.9
38.9
21.1
13.9
0.6
1.00
User Defined

Degree
m
C
C
K
C

TABLE 2. MAXIMUM SOLAR HEAT GAINS (W/sqm)

Month
January
February
March
April
May
June
July
August
September
October
November
December

NE
92.7
203.6
338.6
462.1
535.2
556.0
526.2
446.0
324.4
200.1
93.0
68.8

E
553.0
646.0
716.8
715.3
693.9
676.6
679.6
690.2
678.6
616.4
544.6
512.4

SE
784.1
782.8
716.3
590.6
487.6
439.9
474.6
569.8
688.5
755.1
772.3
777.3

S
777.3
695.8
553.9
362.7
232.7
190.6
226.1
350.1
540.0
676.7
766.2
794.2

SW
784.1
782.8
716.3
590.6
487.6
439.9
474.6
569.8
688.5
755.1
772.3
777.3

W
553.0
646.0
716.8
715.3
693.9
676.6
679.6
690.2
678.6
616.4
544.6
512.4

NW
92.7
203.6
338.6
462.1
535.2
556.0
526.2
446.0
324.4
200.1
93.0
68.8

N
74.3
86.4
99.4
112.1
120.8
147.6
126.0
117.3
102.9
88.9
75.3
68.8

HOR
556.1
684.3
795.3
854.2
872.7
871.1
860.7
836.7
769.1
671.5
552.7
499.6

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ii.

INDOOR CRITERIA
OUTDOOR
AIR

INDOOR CONDITIONS
ITEM

SPACE

SUMMER

WINTER

TEMP
DB
(C)

RH
(%)

TEMP
DB
(C)

RH
(%)

INDOOR
PRESS.
(Pa)

INTERNAL HEAT GAINS

EQUIP DISSIP

REQ.

PEOPLE
(No.)

LIGHTS
2
(W/m )

SENS.
(W)

LAT.
(W)

GAS
TURBINE
AREA

43.9

NA

NA

NA

+25

12 ACH

21.5

514000

GENERATOR
AREAS

43.9

NA

NA

NA

+25

12 ACH

21.5

130000

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SECTION 3

HVAC SYSTEMS DESIGNATION

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i.

SYSTEM DEFINITION:
SYSTEM-1

EQUIPMENT

NO.

DESCRIPTION

TYPE

UNIT TAG

VENTILATION SYSTEM

AIR HANDLING UNIT

CTG-AHU-1

VENTILATION SYSTEM

AIR HANDLING UNIT

CTG-AHU-2

VENTILATION SYSTEM

AIR HANDLING UNIT

CTG-AHU-3

VENTILATION SYSTEM

AIR HANDLING UNIT

CTG-AHU-4

VENTILATION SYSTEM

AIR HANDLING UNIT

CTG-AHU-5

VENTILATION SYSTEM

AIR HANDLING UNIT

CTG-AHU-6

VENTILATION SYSTEM

AIR HANDLING UNIT

CTG-AHU-7

VENTILATION SYSTEM

AIR HANDLING UNIT

CTG-AHU-8

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SERVED AREA
GAS TURBINE
AREA
GAS TURBINE
AREA
GAS TURBINE
AREA
GAS TURBINE
AREA
GAS TURBINE
AREA
GAS TURBINE
AREA
GENERATOR
AREAS
GENERATOR
AREAS

NOTES
DUTY- 13.3%
DUTY- 13.3%
DUTY- 13.3%
DUTY- 13.3%
DUTY- 13.3%
DUTY- 13.3%
DUTY- 10.0%
DUTY- 10.0%

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SECTION 4

OVERALL HEAT TRANSFER COEFFICIENTS

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i.

U VALUE SUMMARY:

ITEM

DESCRIPTION

HEAT TRASNFER
COEFFICIENT
U
(W/m2.K)

1
2
3
4
5

EXTERIOR WALL
ROOF
FLOOR
EXTERIOR DOORS
WINDOWS

0.25
0.25
1.30
5.80
3.50

ii.

NOTES

U VALUE DETAILED CALCULATION:

EXTERIOR WALL

ITEM

DESCRIPTION

THICKNESS
(mm)

HEAT
TRANSFER
FILM COEFF.
(h)
(W/m2.K)

THERMAL
CONDUCTIVITY
(k)
(W/m.K)

THERMAL
RESISTANCE
(R)
(m2.K/W)

REFERENCES/NOTES

0.12

JORDANIAN NATIONAL
CODES

EXTERIOR WALL

1
1.1

INDOOR AIR FILM

HEAT FLOW

1.2

SHEET METAL

NEGLIGIBLE

1.3

POLYSTYRENE

130

1.4

SHEET METAL

NEGLIGIBLE

1.5

OUTDOOR AIR FILM

HEAT FLOW,
18 km/h WIND

8.33

JORDANIAN NATIONAL
CODES
0.034

3.82

JORDANIAN NATIONAL
CODES
16.6

0.06

OVERALL THERMAL
RESISTANCE
(R)
(m2.K/W)

JORDANIAN NATIONAL
CODES

4.00

OVERALL HEAT
TRANSFER COEFF.
(U)
(W/ m2.K)

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JORDANIAN NATIONAL
CODES

0.25

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ROOF

ITEM

DESCRIPTION

THICKNESS
(mm)

HEAT
TRANSFER
FILM COEFF.
(h)
(W/m2.K)

THERMAL
CONDUCTIVITY
(k)
(W/m.K)

THERMAL
RESISTANCE
(R)
(m2.K/W)

REFERENCES/NOTES

ROOF

2.1

INDOOR AIR FILM

HEAT FLOW

2.2

SHEET METAL

NEGLIGIBLE

2.3

POLYSTYRENE

130

2.4

SHEET METAL

NEGLIGIBLE

2.5

OUTDOOR AIR FILM

HEAT FLOW,
18 km/h WIND

8.33

JORDANIAN NATIONAL
CODES
JORDANIAN NATIONAL
CODES
JORDANIAN NATIONAL
CODES
JORDANIAN NATIONAL
CODES

0.12

0.034

3.82

16.6

JORDANIAN NATIONAL
CODES

0.06

OVERALL THERMAL
RESISTANCE
(R)
(m2.K/W)

4.00

OVERALL HEAT
TRANSFER COEFF.
(U)
(W/ m2.K)

0.25

FLOOR

ITEM

DESCRIPTION

THICKNESS
(mm)

HEAT
TRANSFER
FILM COEFF.
(h)
(W/m2.K)

THERMAL
CONDUCTIVITY
(k)
(W/m.K)

THERMAL
RESISTANCE
(R)
(m2.K/W)

REFERENCES/NOTES

0.12

JORDANIAN NATIONAL
CODES

0.25

JORDANIAN NATIONAL
CODES

FLOOR

3.1

INDOOR AIR FILM

HEAT FLOW

3.2

RCC

8.83
300

1.2

OVERALL THERMAL
RESISTANCE
(R)
(m2.K/W)

0.77

OVERALL HEAT
TRANSFER COEFF.
(U)
(W/ m2.K)

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EXTERIOR DOORS

ITEM

DESCRIPTION

EXTERIOR DOORS

THICKNESS
(mm)

HEAT
TRANSFER
FILM COEFF.
(h)
(W/m2.K)

THERMAL
CONDUCTIVITY
(k)
(W/m.K)

THERMAL
RESISTANCE
(R)
(m2.K/W)

REFERENCES/NOTES

0.17

JORDANIAN NATIONAL
CODES

THERMAL
RESISTANCE
(R)
(m2.K/W)

REFERENCES/NOTES

0.29

JORDANIAN NATIONAL
CODES

DOUBLE SKINNED PRESSED

STEEL DOOR
OVERALL THERMAL
RESISTANCE
(R)
(m2.K/W)

OVERALL HEAT
TRANSFER COEFF.
(U)
(W/ m2.K)

5.8

WINDOWS

ITEM

DESCRIPTION

WINDOWS

THICKNESS
(mm)

HEAT
TRANSFER
FILM COEFF.
(h)
(W/m2.K)

THERMAL
CONDUCTIVITY
(k)
(W/m.K)

Double glazing, 6mm air

space, vertically installed,
operable, aluminum frame
OVERALL THERMAL
RESISTANCE
(R)
(m2.K/W)

OVERALL HEAT
TRANSFER COEFF.
(U)
(W/ m2.K)

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3.5

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SECTION 5

OUTDOOR AIR SIZING

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i.

10.1

PEOPLE
(no.)

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580

22

PRESSUR
(Pa)

GENERATOR
AREAS

1295

SPACE
VOLUME
3
(m )
CEILING
HEIGHT
(m)

GAS
TURBINE
AREA

FLOOR AREA
2
(m )

CTGAHU1
CTGAHU2
CTGAHU3
CTGAHU4
CTGAHU5
CTGAHU6
CTGAHU7
CTGAHU8

SPACE

EQUIPMENT

SYSTEM
1

OUTDOOR AIR SIZING:

+25

MINIMUM OUTDOOR AIR

REQUIREMENTS
RATE
ACH

L/S.per

L/s.m

12

MINIMUM EXHAUST AIR

REQUIREMENTS
RATE

AIR
FLOW
3
(m /h)

REF.

468300

AS PER
DESIGN
REQ.

ACH

L/S.
per

L/S.
2
m

AIR
FLOW
3
(m /h)

REF.

HIGHEST
OUTDOOR
AIR
3
(m /h)

468300

HIGHEST
EXHAUST
AIR
3
(m /h)

OUTDOOR
AIR
ADOPTED
IN CALC'S
3
(m /h)

468300

28490

5860

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SECTION 6

CALCULATION INPUT DATA

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ZONE INPUT REPORT

ZoneName: CTG HALL
Location: Amman, Jordan
Prepared by: UCs

Block Load 3.05

February 02, 2010
Page: 1
TABLE 1. GENERAL ZONE DATA

GENERAL ZONE DATA

Zone Name
Floor Area
Building Weight
LIGHTING DATA
Lighting Usage
Unoccupied Diversity
Wattage Multiplier
Fixture Type
OTHER ELECTRIC
Usage
Unoccupied Diversity
PEOPLE
Occupancy
Unoccupied Diversity
Activity Level
Sensible Gain
Latent Gain

CTG HALL
1,875.0 sqm
Medium

21.53 W/sqm
0 %
1.10
Recessed, Not Vented

644,000 Watts
0 %

1.0
0
Seated At Rest
67.4
35.2

MISCELLANEOUS LOADS
Sensible
Latent
Unoccupied Diversity

0.0 W
0.0 W
0 %

INFILTRATION
Cooling
Heating

.00 L/s/sqm
.00 L/s/sqm

SLAB
Area
Perimeter
Depth

1,659.0 sqm
288.0 m
0.30 m

People
%
W /person
W /person

TABLE 2. BUILDING MATERIAL

TYPE 1

TYPE 2

TYPE 3

WALL DETAIL
U-Value (W/sqm/K )
Weight (kg/sqm)
Color

0.250
361
Medium

0.570
361
Light

0.570
361
Light

ROOF DETAIL
U-Value (W/sqm/K )
Weight (kg/sqm)
Color

0.250
Medium
Medium

0.740
Medium
Light

0.740
Medium
Light

GLASS INFORMATION
U-Value (W/sqm/K )
Glass Factor
Interior Shades

3.500
0.50
No

3.010
0.51
No

3.010
0.51
No

SHADE INFORMATION
Window Height (m)
Window Width (m)
Reveal Depth (mm)
Overhang Height (mm)
Overhang Ext (mm)
Fin Separation (mm)
Fin Extension (mm)

1.0
1.0
0.0
0.0
0.0
0.0
0.0

2.4
1.2
0.0
0.0
0.0
0.0
0.0

2.4
1.2
0.0
0.0
0.0
0.0
0.0

ZONE INPUT REPORT

ZoneName: CTG HALL
Location: Amman, Jordan
Prepared by: UCs

Block Load 3.05

February 02, 2010
Page: 2
TABLE 3. EXPOSURE AREA

Exposure
East
West
South
North
Roof

Wall
Type
1
1
1
1
1

Gross
Area
(sqm)
1,967.3
1,967.3
495.0
495.0
1,659.0

Glass
Type
1
1
1
1
0

Glass
Area
(sqm)
74.0
74.0
12.0
18.0
0.0

Shade
Type

Glass
Type

0
0
0
0
0

0
0
0
0
0

Glass
Area
(sqm)
0.0
0.0
0.0
0.0
0.0

TABLE 4. PARTITION DATA

Net Area (sqm)
U-Value (W/sqm/K )
Adjacent Region Temp
Cooling
Heating

Partition 1
0.00
.568

Partition 2
0.00
.568

Partition 3
0.00
.568

32.2 C
32.2 C

32.2 C
32.2 C

32.2 C
32.2 C

Shade
Type
0
0
0
0
0

SYSTEM INPUT REPORT

System: Ventilation
Location: Amman, Jordan
Prepared by: UCs

Block Load 3.05

February 02, 2010
Page: 1
TABLE 1. HVAC SYSTEM DESCRIPTION

System Type
Clg and Warm Air Ht
System Start
:00
Duration
24
SIZING SPECIFICATIONS
Supply
38.0
Ventilation
15.00
Exhaust
0.00
FACTORS
Coil Bypass
0.050
Safety (Sens)
0
Safety (Latent)
0
Heating Safety
0

hrs
C
L/s/Per
L/s

THERMOSTAT SETPOINTS
Cooling (Occ.)
Cooling (Unocc.)
Heating
RETURN AIR PLENUM
FAN
Configuration
Static Pressure

%
%
%

TABLE 2. SYSTEM ZONING INFORMATION

System Arrangement:
Total Zones Selected:

Selected Zones:

All zones served by a common air handler

1

1) CTG HALL

43.0 C
43.0 C
21.0 C
No
Blow Thru
250.00 Pa.

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SECTION 7

CALCULATION RESULTS

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i.

RESULTS SUMMARY:
SUMMER

CTG

1659

23

38157

+25

43

NA

TOTAL

CTGAHU1
CTGAHU2
CTGAHU3
CTGAHU4
CTGAHU5
CTGAHU6
CTGAHU7
CTGAHU8

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SUPPLY
AIIRFLOW
(m3/h)

RETURN
AIIRFLOW
(m3/h)

EXHAUST
AIIRFLOW
(m3/h)

OUTDOOR
AIR
(m3/h)

476000

476000

476000

476000

63500

63500

63500

63500

63500

63500

63500

63500

63500

63500

63500

63500

47500

47500

47500

47500

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RH
(%)

1.1

EQUIPMENT

INDOOR
COND.

DB
(C)

SPACE
VLOUME
(m3)

LAT.
(kW)

CEILING
HEIGHT
(m)

SEN.
(kW)

FLOOR
AREA
2
(m )

COOLING
LOAD

RH
(%)

SPACE

INDOOR
COND.

DB
(C)

ITEM

PRESS.
REL. TO
ADJ.
SPACE
(Pa)

WINTER

HEATING
LOAD
(W)

COOLING
CAPACITY
(W)

HEATING
CAPACITY
(W)

TERMINAL
UNIT REF.

DETAILED SYSTEM LOAD REPORT

System: Ventilation
Location: Amman, Jordan
Prepared by: UCs

Block Load 3.05

February 02, 2010
Page: 1

TABLE 1. CALCULATION INFORMATION

Design Load:
Db/Wb Temp
Winter Design Temp

July 17:00
37.5/ 20.7 C
0.6 C

TABLE 2. LOAD COMPONENT SUMMARY

Load Component
Solar Loads
Wall Transmission
Roof Transmission
Glass Transmission
Skylight Transmission
Partitions
Lighting
Other Electric
People
Infiltration
Miscellaneous
Slab
Pulldown/Warm-Up
Safety Factor
Total Zone Loads
Ventilation Load
Supply Fan Load
Plenum Load thru Wall
Plenum Load thru Roof
Plenum Load - Lights
Reheat Load
Total Coil Loads

Walls:

Glass:

Component
NE
E
SE
S
SW
W
NW
N
NE
E
SE
S
SW
W
NW
N
Hor

Details
178
4,747
1,659
178
0
0
21.53
343.47
1

Design Cooling
Sensible
(W )
18,024
-3,874
1,700
-4,492
0
0
44,323
643,620
67
0
0
0
0
699,368
-73
58,792
0
0
0
0
758,087

sqm
sqm
sqm
sqm
sqm
sqm
W/sqm
W/sqm
People

1,659 sqm
0/0/0 %
12
126,997
0
0
0

L/s
L/s
%
%
%

TABLE 3. WALL AND GLASS BREAKDOWN

Total
Net Area
(sqm)
0
1,893
0
483
0
1,893
0
477
0
74
0
12
0
74
0
18
0

Cooling
Transmission
(W )
0
-546
0
-674
0
-1,727
0
-928
0
-1,867
0
-303
0
-1,867
0
-454
0

Cooling
Solar Load
(W )
0
5,976
0
524
0
10,747
0
778
0

Loads
Latent
(W )
35
0
0
0
35
-35
0
Heating
Transmission
(W )
0
9,651
0
2,462
0
9,651
0
2,431
0
5,281
0
856
0
5,281
0
1,285
0

Design
Heating
(W )
24,194
8,456
12,702
0
0
0
6,403
0
51,756
269
52,025

DETAILED ZONE LOAD REPORT

System: Ventilation
Location: Amman, Jordan
Prepared by: UCs

Block Load 3.05

February 02, 2010
Page: 1
TABLE 1. GENERAL INFORMATION
Zone Name:
System Name:
Design Load:
Db/Wb Temp:

CTG HALL
Ventilation
July 17:00
37.5/ 20.7 C

TABLE 2. LOAD COMPONENT SUMMARY

Load Component
Solar Loads
Wall Transmission
Roof Transmission
Glass Transmission
Skylight Transmission
Partitions
Lighting
Other Electric
People
Infiltration
Miscellaneous
Slab
Pulldown/Warm-Up
Safety Factor
Total Zone Loads

Details
178
4,747
1,659
178
0
0
21.53
343.47
1

sqm
sqm
sqm
sqm
sqm
sqm
W/sqm
W/sqm
People

1,659 sqm
0/ 0 %

Design Cooling Loads

Sensible
(W )
18,024
-3,874
1,700
-4,492
0
0
44,323
643,620
67
0
0
0
0
699,368

Design
Heating
(W )
24,194
8,456
12,702
0
0
0
6,403
0
51,756

TABLE 3. WALL AND GLASS BREAKDOWN

Walls:

Glass:

Component
NE
E
SE
S
SW
W
NW
N
NE
E
SE
S
SW
W
NW
N
Hor

Total
Net Area
(sqm)
0
1,893
0
483
0
1,893
0
477
0
74
0
12
0
74
0
18
0

Cooling
Transmission
(W )
0
-546
0
-674
0
-1,727
0
-928
0
-1,867
0
-303
0
-1,867
0
-454
0

Cooling
Solar Load
(W )
0
5,976
0
524
0
10,747
0
778
0

Heating
Transmission
(W )
0
9,651
0
2,462
0
9,651
0
2,431
0
5,281
0
856
0
5,281
0
1,285
0

Universal Consultancy Services

vi.

RESULTS CALCULATION:

Solar Loads = 18,024 W (From E20 II-Block Load)

Wall Transmission = -3,874 W (From E20 II-Block Load)
Roof Transmission = 1,700 W (From E20 II-Block Load)
Glass Transmission = -4,492 W (From E20 II-Block Load)
Lighting = 44,323 W (From E20 II-Block Load)
Heat dissipation in generator building = 130,000 W
Heat dissipation from GT building = 514,000 W
Total Load = 699,681 W
Temperature difference = 5 C
Specific heat at constant pressure (Cp) = 1.007 kJ/kg.C
Density of air @ 38.9 C ambient condition ( )= 1.1 kg/m

To find the Air Flow required for ventilation:

Heat Load

= Q X Cp X

X T

699,681

= Q X 1.007 X 1.1 X 5

Q1

= 126,330 l/s (Based on waste heat removal basis)

3

= 454788 m /hr
Q2

= ACH X Volume (Based on air change method)

= 12 X ((1295 X 22)+(2 X 290 X10.1))
= 412176 m3/hr
3

To maintain ( P = 25 Pa) inside CTG building we need air flow = 13415 m /hr
Total air flow required for ventilation

= 457884 + 13415
3

= 468,292 m /hr
3

476,000 m /hr
Distribution of fans shall be as follows:
-

Heat dissipation in generator building = 130,000 W

Heat dissipation from GT building = 514,000 W
Percentage of heat in generator building = 130 / (514 +130) = 20%

Therefore, 20% of the required air will be supplied to generator areas and 80% to turbine area.

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Fax. + 962.6. 55 22 476

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Universal Consultancy Services

Exhaust air quantity

= 476000 -13415
3

= 462,585 m /hr
3

= 128.5 m /s
Exhaust air velocity

= 1.75 m/s

Required area for roof vent

= 128.5 / 1.75
= 73.4 m
= 74 m

Required area (A)

= Available area area blocked by rafters.

= AAV - AR

Available area (AAV)

=LxW

where, L = Available span length for roof vent (84.0m)

W = Throat width (m)
Area blocked by rafters (AR) = LR x W R x N
where, LR = Length of the rafter blocking exhaust air flow i.e nothing but throat width (W)
W R = Rafter width (0.229 m)
N = No. of rafters (17 nos.)
A

= AAV - AR
= (L x W - LR x W R x N)

74.0

= (84.0 x W W x 0.229 x 17)

= 74.0 / 80.11
= 0.924 m

Throat size for roof vent = 950 mm

Tel. + 962.6. 55 29 476

Fax. + 962.6. 55 22 476

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