Group

Heat pumps up to 2000kW

The company
KWT
2/3
Since the company was established in 1979,
the engineers at KWT AG have spearheaded
development in the efcient utilisation of
cooling and heating energy. Company founder,
Kurt Trssel, has made a particular study of
the energy contained in the waste heat from
refrigeration systems. KWT continues to
work intensively on making best use of the
economically viable synergies of cooling and
heating in refrigeration units. The company
also recognises the demand for smaller heat
pumps for domestic use.
KWT became established as one of the
leading suppliers of heat pumps, refrigeration
technology and primary energy sources, as
well as efcient combinations of the above,
by pursuing intensive further development
and becoming involved in geothermal probe
technology. Continuous growth has been
brought about through increasing demand
from a host of diferent sectors, the high
quality of our products and close proximity
to customers. Recent integration into the
Viessmann Group has been a signicant step
for the company in targeting European and
Asian markets.
Standardised solutions for international
markets
The global sales activities of the Viessmann
Group ensure further growth and create new
opportunities, even within KWT. While special
heat pumps with functions specially tailored
for the customer used to be a cornerstone
of the industry, the internationalisation of the
market in Europe has brought new demands
for increasingly afordable, standardised
solutions.
The new test bed for up to 750kW output,
which complies with EHPA Quality Label
standards, assures quality and enables the
continuous further development of
refrigeration technology using all available
options. The transfer of knowledge within the
Viessmann Group creates useful synergies.
This gives customers a high level of security,
reliability and the certainty that they will
receive a product that suits their needs.
KWT: Heat pumps, refrigeration technology and
primary sources for efficient energy utilisation
KWT has great potential for developing heat pump technology as it has more than 30 years'
experience in this sector and has recently joined the Viessmann Group.
KWT strives to reach the highest possible level
of efciency in its use of natural heat. In doing
so, it aims for the longest possible service
life for the entire system, which is usually the
more economical solution. The application
of new technologies and refrigerants is also
a challenge for KWT. To respond to this, the
company has already started using natural
refrigerants such as CO
2
and propane. Last,
but not least, the economical and efcient
utilisation of waste heat at particularly high
temperatures is an additional area where
powerful heat pumps can be used.
Minergie standards at head ofce
At KWT's head ofce in Worb, near Bern in
Switzerland, ecological construction and the
"Minergie" standards have been implemented.
The installation of heat pumps with a natural
cooling function ensures a pleasant room
ambience with a minimal energy demand.
On the roof of the company's building, a
certied photovoltaic system with 372kW
output exports up to 305MWhp.a. to the
grid and makes a sustainable contribution to
reducing CO
2
emissions.
KWT head ofce in Worb, in the
canton of Bern, Switzerland
General
4/5
Heat pumps should be your rst choice if your
priorities are both to save on heating costs
and to generate heat in an environmentally
responsible way. After all, the energy a heat
pump uses is free and available in unlimited
supply from the environment. Only electrical
power is required to drive the heat pumps.
This makes you independent of fossil fuels,
and in addition, actively contributes towards
reducing CO
2
emissions and protecting the
climate. With a heat pump, up to 80percent of
the total energy demand is taken from nature,
in a highly efective and environmentally
responsible manner. Only 20 to 30percent
electrical energy needs to be invested. The
principle is as simple as it is ingenious: The
solar energy stored in the ambient air, in the
ground or in groundwater is used to efciently
heat domestic hot water and heating water.
Added value through cooling function and
dual mode systems
With its high output, a KWT heat pump is
designed for larger residential complexes
and commercial operations. In addition, with
slight adjustments, it can also be used to cool
the living space in summer. The idea that a
heat pump only suits new build projects has
been long disproved. On the contrary, if an
existing conventional oil or gas heating system
is replaced with a heat pump as part of a
modernisation project, there will be signicant
savings on heating bills and lower emissions
at the same time (for example compared to a
dual mode system).
Heating with renewable energy from the
environment even in higher output ranges
Natural heat is an advanced and cost efective alternative to fossil fuels. It is available free
of charge and ofers independence from oil and gas.
KWT heat pumps are designed for
larger residential complexes and
commercial operations
(Pictured below: Herrbrugg High
School)
Recovering environmental energy
Various natural sources are suited to heat
recovery using a heat pump:
Groundwater
Geothermal probes
Energy piles
River or lake water
Air
Waste water and other waste heat
Not all these heat sources can be used
everywhere. It is therefore necessary to
consult the relevant authorities before making
a decision, and discuss the technical options
with KWT.
Vitocal300-G/-W Pro
6/7
With the Vitocal 300-G/-WPro heat pumps,
Viessmann extends the company's range of
standard heat pumps up to 290kW. The Pro
series features all the characteristics of the
highly efcient Vitocal300-G series. With seven
output sizes, most requirements of residential
and commercial buildings can be reliably met.
Standardising these appliances enables quick
and comprehensive engineering, as well as
providing transparent calculation parameters.
Higher output levels can be achieved by linking
up to ve Vitocal300Pro heat pumps in a
single cascade.
Pre-assembled electrical equipment
The electrical equipment is already integrated
inside the heat pump casing as standard.
Factory-tted contactors for fail-safe primary
and secondary pumps, as well as protection
for the compressor, guarantee straightforward
installation and the safe and rapid integration
of the heat pump into the system.
Proven and reliable technology
The control philosophy was adopted from the
Vitocal series for detached and two-family
houses. Here too, the Refrigerant Cycle
Diagnostic System (RCD) checks efciency
continuously and safeguards the efcient
and reliable function at any operating point
through the interaction between the electronic
expansion valve (EEV) and the extensive
sensor technology. The Vitotronic200 regulates
up to three heating circuits, and thanks to
its natural cooling function ensures pleasant
ambient conditions on hot summer days.
With the optional addition of a Vitocom300
communication module, a comprehensive
range of settings and system optimisations
can be undertaken from anywhere via internet
or mobile phone.
Vitocal300-G/-W Pro:
Brine/water and water/water heat pumps
Standardised control concept and optimised dimensions perfectly complement Viessmann
system design.
Space efcient design
The hermetically sealed design with new scroll
technology and the R410A refrigerant both
signicantly reduce the space required for
siting these appliances. At only 88cm wide,
with clearance at the bottom to facilitate lifting
and removable casing panels, the appliance is
very easy to handle.
Unique water/water version
Only the Vitocal300-WPro series, with its
stainless steel tubular evaporator, provides
a reliable solution for the direct use of
groundwater without an extra intermediate
circuit. The benets of low installation costs
and maximum efciency are therefore felt
immediately.
Series with PLC based Vitotronic
All output sizes are also available with a
PLC (programmable logic control) based
control unit. Communication options such as
Modbus/BACnet or LAN in particular enable
an even more targeted integration in BMS
systems. The PLC based control also allows
management of re-coolers and control of up to
three heating/cooling circuits.
Easy-to-operate Vitotroniccontrol unit
with plain text and graphic display
Boiler room in Manisa (Turkey)
Vitocal300-G/-W Pro
Vitocal300-GPro
type BW 302.B150
Take advantage of these benets:
Brine/water heat pump, single and two-stage
Heating output: 89 to 240kW; maximum 1200kW (as cascade)
Water/water heat pump, single and two-stage
Heating output: 112 to 290kW; maximum 1450kW (as cascade)
Low operating costs through high coefcients of performance: COP (COP = coefcient of
performance) to EN14511 up to 4.8 (brine 0C/water 35C) and up to 6 (water 10C/
water 35C)
Maximum ow temperature 60C (brine 5C) for all sizes
Low noise and vibration emissions through sound-optimised appliance design
Low running costs with the highest level of efciency at any operating point through the
innovative RCD (Refrigerant Cycle Diagnostic) system with electronic expansion valve (EEV)
Easy-to-operate Vitotroniccontrol unit with plain text and graphic display
Ready-to-use connection for fail-safe primary and secondary pumps
Electronic soft starter for lower starting current and less power drawn from the mains
Water/water version with stainless steel tubular evaporator for operation without
intermediate circuit
Required installation opening only 855mm wide
Exceptionally quiet operation for this output range
Series with PLC based Vitotronic for better integration in BMS systems
Vitocal300-G Pro
type BW 302.B120
8/9
Specification
Vitocal300-G Pro Type BW 301.B090 BW 301.B120 BW 302.B090 BW 302.B120
Output data
(to EN14511, B0/W35C, 5K spread)
Rated heating output
Cooling capacity
Power consumption
Coefcient of performance (COP) in
heating mode
kW
kW
kW
93
74.5
19.5
4.77
121
96.4
24.8
4.83
89.4
72
18.3
4.88
117.7
93.8
24.4
4.8
Dimensions
Length
Width
Height
mm
mm
mm
1343
911
1650
1343
911
1650
1343
911
1650
1343
911
1650
Weight kg 700 800 705 810
Number of compressors pce 1 1 2 2
Vitocal300-GPro brine/water heat pump
Vitocal300-WPro water/water heat pump
Vitocal300-WPro Type WW 301.B125 WW 301.B155 WW 302.B125 WW 302.B155
Output data
(to EN14511, W10/W35C, 5K spread)
Rated heating output
Cooling capacity
Power consumption
Coefcient of performance (COP) in
heating mode
kW
kW
kW
116
102
20.2
5.74
140.1
120
24.2
5.79
112.1
94.2
18.6
6.0
145.1
121.6
24.4
5.94
Dimensions
Length
Width
Height
mm
mm
mm
1932
911
1650
1932
911
1650
1932
911
1650
1932
911
1650
Weight kg 1015 1055 1035 1060
Number of compressors pce 1 1 2 2
Vitocal300-G Pro Type BW 302.B150 BW 302.B180 BW 302.B250
Output data
(to EN14511, B0/W35C, 5K spread)
Rated heating output
Cooling capacity
Power consumption
Coefcient of performance (COP) in
heating mode
kW
kW
kW
145
117
31.5
4.6
180
145.4
39.2
4.6
240
191.4
50.4
4.76
Dimensions
Length
Width
Height
mm
mm
mm
1932
911
1650
1932
911
1650
1932
911
1650
Weight kg 1130 1190 1300
Number of compressors pce 2 2 2
Vitocal300-WPro Type WW 302.B200 WW 302.B250 WW 302.B300
Output data
(to EN14511, W10/W35C, 5K spread)
Rated heating output
Cooling capacity
Power consumption
Coefcient of performance (COP) in
heating mode
kW
kW
kW
186
157
32.1
5.9
240
199
42.1
5.7
290
244
49.5
5.8
Dimensions
Length
Width
Height
mm
mm
mm
2521
911
1650
2521
911
1650
2521
911
1650
Weight kg 1330 1380 1425
Number of compressors pce 2 2 2
Vitocal350-G Pro
10/11
Based on the compressors with piston
technology available for these output ranges,
this heat pump has all the hallmarks of a
powerful and efcient unit. In addition, the
newly developed frame casing is easy to
install and transport. The anti-vibration cladding
(supplied separately) ts exactly and reduces
the handling weight by around 200 kg.
Equipment to meet customer needs
The electrical equipment is fully integrated
inside the heat pump casing as standard.
Connections via contactors for circulation
pumps are pre-tted and easily accessible.
Optional function extensions can be readily
integrated with prefabricated elements or,
for made-to-order products, can be ordered
ex works. The integral part-winding start-up
function ensures low starting currents. These
can be improved even further if necessary
through the use of electronic soft starters.
Reliable technology and simple operation
Lying at the heart of the refrigerant circuit are
German-manufactured semi-hermetic piston
compressors. Depending on the output, two
or three compressors are integrated into
the refrigerant circuit by way of a compound
connection. This makes optimum efciency
and operation possible even under partial
load conditions. Efciency is supported by
electronic injection valves which are self-
closing with zero current to ensure maximum
safety if there is a power failure, for example.
Additionally, the hermetically sealed design
with reduced threaded connections and the
absence of safety valves in the refrigerant
circuit guarantee tightness and a long service
life. For optimal control of the system and
refrigerant circuit, the Vitocal350-GPro is
equipped with a PLC-assisted Vitotronic. The
intuitive, full graphic touchscreen is generously
sized for this output range. The full colour
mode makes diferences in function and
operation quickly recognisable.
Vitocal350-GPro:
Brine/water heat pump
The new Vitocal350-GPro extends the heat pump output range from 27 to 197kW, with ow
temperatures up to 73C.
Remote monitoring and communication
The control unit boasts numerous
communication options, from a simple
analogue modem to LAN-supported systems.
Modbus technology and BACnet can be used
and can make the system rapidly accessible
via remote maintenance and communication
over the internet, for example.
Optimised appliance construction for quiet
operation
As is the case for all heat pumps, the
compressors emit noise in the 50 to 60Hz
range. Due to the high quality construction of
the frame and anti-vibration casing
components, it has been possible to keep this
noise within the casing. Vibrations on the base
support are barely perceptible as the 3-D anti-
vibration construction is specically designed
to dissipate oscillations. With sound power
levels of, for instance, 65dB (A) for the 197kW
heat pump, its values stand up well by
comparison with other products in this market
segment.
DHW heating
The Vitocal350-GPro series achieves high ow
temperatures of up to 73C, making it suitable
for hygiene-compliant domestic hot water
heating. The special temperature maintaining
facility guarantees hot inlet temperatures
downstream of the loading system at all times,
even during the loading cycle.
Easy-to-use PLC-based Vitotronic
with touchscreen
Vitocal350-G Pro
Vitocal350-G Pro
type BW 352.A156
Take advantage of these benets:
Brine/water heat pump, two-stage
Heating output: 27 to 197kW
High ow temperatures up to 73C
Low operating costs through high coefcients of performance: COP to EN14511 up to 4.4
(brine 0C/water 35C)
Viable under partial load conditions due to the use of two or three compressors with an
equal output
Low noise and vibration emissions through sound-optimised appliance design
Intuitive use of the control unit via touchscreen with schematics
Possibility of factory pre-installation for products made especially for particular projects
Provided with standard part-winding start-up system for low starting currents or tted with
an optional electronic soft starter
Traditional cooling/heating function with bufer cylinder
PLC-supported Vitotronic with Modbus and BACnet communication interface
Vitocal350-G Pro
type BW 352 A156, internal view
showing additional options
12/13
Specification
Vitocal350-G Pro Type
BW 352.A027/
BW 352.A027SA
BW 352.A034/
BW352.A034SA
BW 352.A056/
BW 352.A056SA
BW352.A076/
BW352.A076SA
BW 352.A097/
BW 352.A097SA
Output data
(to EN14511, B0/W35C, 5K spread)
Rated heating output
Cooling capacity
Power consumption
Coefcient of performance (COP) in heating mode
kW
kW
kW
27.2
20.8
6.4
4.2
34.3
26.4
7.9
4.4
56.1
43.2
12.8
4.4
76
58.8
17.3
4.4
96.9
74.6
21.9
4.4
Output data
(to EN14511, W10/W35C, 5K spread)
Rated heating output
Cooling capacity
Power consumption
Coefcient of performance (COP) in heating mode
kW
kW
kW
37.1
29.7
7.4
5
47.8
39
8.8
5.4
78.6
64.2
14.5
5.4
106
85.9
19.6
5.4
134.1
109.6
24.6
5.5
Dimensions
Length
Width (values in brackets excl. anti-vibration casing)
Height
mm
mm
mm
1848
820 (750)
1450
1848
820 (750)
1450
1848
820 (750)
1450
2153
911 (850)
1650
2153
911 (850)
1650
Number of compressors pce 2 2 2 2 2
Vitocal350-GPro brine/water heat pump
Vitocal350-G Pro Type
BW 352.A114/
BW 352.A114SA
BW 352.A132/
BW 352.A132SA
BW 352.A156/
BW 352.A156SA
BW 353.A172/
BW 353.A172SA
BW 353.A198/
BW 353.A198SA
Output data
(to EN14511, B0/W35C, 5K spread)
Rated heating output
Cooling capacity
Power consumption
Coefcient of performance (COP) in heating mode
kW
kW
kW
114.2
88.4
25.9
4.4
131.9
101.5
30.4
4.3
155
119.2
36.3
4.3
170.2
132
38.4
4.4
197
153.3
45.7
4.4
Output data
(to EN14511, W10/W35C, 5K spread)
Rated heating output
Cooling capacity
Power consumption
Coefcient of performance (COP) in heating mode
kW
kW
kW
158
129
29
5.4
181.9
148
34.1
5.3
214.4
173.8
40.7
5.3
237
193.5
44.2
5.4
274.2
222.8
52
5.3
Dimensions
Length
Width (values in brackets excl. anti-vibration casing)
Height
mm
mm
mm
2153
911 (850)
1650
2153
911 (850)
1650
2153
911 (850)
1650
2816
911 (850)
1650
2816
911 (850)
1650
Number of compressors pce 2 2 2 3 3
Types BW 352.A027SA to BW 353.A198SA come tted as standard with electronic soft starters with integral rotary eld control
Investment and energy
costs
10-family house, well
insulated
System solutions
14/15
KWT works together with its clients to develop
solutions that are based on more than 30
years' experience, that will meet practical,
everyday needs, and that will overcome
any and every challenge. All deadlines and
costs arranged can be relied upon, with no
unpleasant surprises.
All systems are designed and built based
on our customers' performance denitions.
All heat pumps and geothermal probes
demonstrate this performance on the test bed
and in practice.
Always the perfect solution
Subject to situation and order, KWT builds
tailored heat pump systems for every
application: water/water, brine/water and air/
water. The output spectrum of the systems
ranges from 15 to 2000kW and can be
extended if required, for example with a
cascade of several heat pumps.
It is also possible to implement a dual mode
heating system. Here, the heat pump provides
the standard supply to heat domestic hot
water and heating water. To absorb peak
loads, for example when temperatures are
extremely low, an oil or gas condensing boiler
is automatically activated.
Heat pumps for every application with any type of
heat source
With technical expertise, outstanding manufacturing ability and many years of experience,
KWT is the heat pump manufacturer of choice for every special application.
A dual mode system, comprising a KWT heat pump and
a Viessmann gas condensing boiler, supplies the Bonner
Werksttten with heat
With their winningly sophisticated
control philosophy, KWT control
systems are very easy to operate
KWT heat pumps are made to measure
and can even be installed under difcult
conditions where space is tight. All materials
and processes used are certied, and were
awarded the ISO9001 quality seal as long ago
as 1996.
Intelligent control concepts
Advanced building services demand
integral control solutions that are capable of
communicating with other systems. KWT
control systems ofer the customer maximum
functionality, combined with an open system
architecture that can communicate with the
systems most widely available on the market.
A KWT control system can regulate ventilation
and heating assemblies as well as DHW
heating, access energy meters and measure
energy usage via M BUS. This is visualised
clearly for the user on the display.
Brine/water
heat pumps
KWT brine/water heat pump with a
heating output of 290kW
1
2
8
7
6
5
3
16/17
Geothermal probes are durable, maintenance-
free heat sources. In conjunction with heat
pumps, they provide energy for heating, and
are also the ideal heat exchanger for natural
cooling. In both cases, KWT brine/water heat
pumps utilise the constant temperature in the
ground.
Optimum design
KWT brine/water heat pumps are designed
and manufactured in accordance with
requirements. Economical and cost efective
ow temperatures of 35 to 40C are ideal for
area heating systems. Upon demand they are
equipped with the latest series of compressors
or multi stage refrigerant circuits for efcient
output modulation. Rotary screw compressors
are ideal as the core of KWT heat pumps.
Flow temperatures up to 55C are completely
acceptable for ventilation systems. If technical
conditions make ow temperatures up to
80C necessary, this can be achieved simply
by using semi-hermetic piston compressors.
DHW heating
DHW temperatures above 60C are often
needed. However, especially with larger
heat pumps, the demand for DHW heating
accounts for the lesser proportion of total
output. With multi stage heat pumps or hot
gas decoupling, KWT heat pumps can provide
the ideal solution to meet this demand.
The use of special safety heat exchangers
guarantees global potable water requirements
are maintained.
Using heat from the ground with geothermal probes
A stable and highly durable heat source
KWT brine/water heat pumps are built around expertise and quality.
Geothermal probe
The geothermal probe is composed of two U-shaped tubes.
In the middle of this tube bundle there is an injection tube
through which a bentonite/cement mixture is pressed after the
probe has been installed. The drill hole is lled from bottom
to top. This guarantees the entire probe is connected with the
surrounding earth, seals of any water-carrying layers from one
another and protects the probe.
1
Injection tube
2
Dual U-shaped tube
probe with two separate
circuits
3
Supply tubes
4
Protective tubing
(if required)
5
Return from the heat
pump (cold)
6
Flow to the heat pump
(hot)
7
Bentonite/cement
mixture
8
Protective cap
Geothermal probe manifold
4
Water/water
heat pumps
KWT water/water heat pump with a
heating output of 500kW
KWT water/water heat pump
18/19
Groundwater at 8 to 12C is a very rich heat
source for a heat pump, as the temperature
level is high all year round. However, due
to uctuating water qualities, special heat
exchangers (evaporators) are usually required,
if no intermediate circuits are intended.
Stainless steel tubular evaporators
KWT heat pumps for groundwater or surface
water are equipped with high grade stainless
steel tubular heat exchangers. The benets are
obvious the evaporator has a large volume
and generously sized surface area, so the
border regions are not vulnerable to icing up.
Light oating parts are simply ushed through
with the medium, and aggressive chemical
uids have little destructive efect on the high
grade stainless steel.
Surface water at 4C
The anomaly of water comes out on top.
Surprisingly, below the ice on a lake, the water
temperature is 4C and we can make use of
this anomaly. Though standard water/water
heat pumps cannot utilise this heat, KWT heat
pumps are specially designed to do just this,
and are equipped with tubular evaporators
made of stainless steel 1.4401 and special de-
icing circuits. This makes lake or river water at
4C usable after all. Especially with particularly
high outputs, to use a heat source such as
Lake Geneva then becomes a possibility as
it can easily provide this required cooling
capacity.
Modular delivery
KWT supplies heat pumps that can be divided
into sectional modules for modernisation and
conversion projects, or employed anywhere
where the handling of large heat pumps is
not a simple matter. These sectional modules
are positioned on site, then connected to one
another and commissioned.
Groundwater and surface water heat sources for
high efficiency
High grade components make KWT water/water heat pumps powerful and reliable.
Refrigerant circuit of a water/water heat pump with stainless steel tubular heat exchanger
Depending on the installation conditions, KWT heat pumps can be delivered as modules
Waste heat
technology
This KWT heat pump uses waste heat to cool the data
processing centre and appliance test beds at the Viessmann
head ofce in Allendorf.
20/21
Waste water and waste heat from industrial
processes contain a great deal of energy,
which is only seldom used. KWT has the
necessary expertise to prevent this loss. Even
for extremely low outside temperatures of
minus 40C, ranging right up to plus 35C,
there is a matching heat pump in the KWT
range.
DHW heating
Waste water from hotels and leisure
complexes is usually at a residual temperature
of 25 to 35C. At the same time, however,
such complexes also require a large amount of
fresh hot water.
KWT, with its ideally suited heat pumps, is
best placed to make use of this waste heat
and so is the perfect partner for such projects.
These heat pumps are highly efcient and
supply a water temperature of 60C.
Utilising waste heat for heating
Heating doesn't always come rst. In many
branches of industry, process water has to be
cooled. This is often achieved using cooling
towers.
A KWT heat pump ofers you a more efcient
and usually more economical solution
especially when the heat extracted from this
process can be re-used elsewhere.
For such application ranges, KWT develops and
builds special heat pumps, which have been
used successfully as system components for
many years.
Using waste water and waste heat from
production processes as heat sources
KWT special systems are built precisely in accordance with your requirements; they are
reliable in operation, and have been used successfully as system components for many
years.
In the ve-star Ritz Carlton Hotel in St Moritz, heat is recovered from waste water
This FEKA waste water pipe is used as a primary source for DHW heating
A KWT waste water heat pump with 150kW output for DHW heating
Air/water
heat pumps
KWT air/water heat pump
Glycol dry coolers for an air/water
heat pump
22/23
Air is readily available as a source of heat.
However, even when cooling is required, air
can easily absorb the extracted heat. KWT air/
water heat pumps make particularly efcient
use of air temperatures down to about 5C,
with which they can cover up to 50% of the
annual heat load.
Design
KWT air/water heat pumps are based on a split
design, comprising a dry cooler and a brine/
water heat pump. The connection is made
simply, using hydraulic lines that carry brine.
Air/water heat pumps in this output range are
operated on a dual mode basis. This means
that above a dened outside temperature, a
second heat source provides backup or takes
over (for example the Vitocrossal300) for more
efcient heat generation. This is regulated via
the integral control unit.
Heating and cooling
Air/water solutions from KWT are suitable
for heating and cooling. In both cases, the
highest level of efciency is guaranteed thanks
to variable speed DC fans. The special design
of the air heat exchangers, with gaps twice
the width of those in conventional chillers,
optimises heat transfer, lowers the pressure
drop of the air ow rate, reduces noise and
ensures a fast and efcient defrost process.
Air as the heat source; ideal in dual mode systems
or to provide cooling
KWT air/water heat pumps for heating and cooling, in conjunction with conventional heat
sources, are an economical solution where cooling is required.
Glycol re-coolers in wall integration version for air/water heat
pumps
Defrosting not reversible
In the high output ranges, the reversible
refrigerant circuit in particular has components
such as 4-way valves that inuence operational
reliability and leakage protection. In this
context, KWT heat pumps work with two
evaporators and two condensers. Defrosting
occurs independently of the heat pump, using
heat from the heating water bufer cylinders or
additional supercooling with an energy store.
The supercooling circuit is particularly efcient,
as this is where environmental energy is used
in the defrosting process.
3.4
3.3
3.2
3.1
3.0
2.9
2.8
2.7
Research and development
Research and development
Natural refrigerants are now an integral part of new developments.
Refrigerant R290 (propane)
KWT has been using natural refrigerants for
more than ten years, even in high output
applications. Alongside CO
2
, R290 (propane)
is receiving increasing attention. Propane is
an extremely efcient refrigerant and has an
excellent volumetric cooling capacity. Heat
pump refrigerant circuits lled with propane
are particularly suited to outdoor installation.
Costly safety measures, such as those needed
in an installation room, are not required. KWT
uses R290 for large outdoor heat pumps up to
around 300kW.
The heat pumps themselves are equipped to
meet the relevant safety regulations, including
explosion-proof design and refrigerant
detection as standard.
Availability: very good
Volumetric cooling capacity:
1.6 x R134a
Environmental compatibility: very good,
GWP 3 (global warming potential)
Pressure: < R410a
Flammability: high
Density: heavier than air
Chemical composition:
single-substance refrigerant
COP comparison
(COP = coefcient of performance)
Air/water heat pump with 150kW where
air 8/water 35C
Air 8C
Evaporation 20C
Glycol return 12C
Glycol ow 16C
R 290 R 404 A R 407 C R 290 R 404 A R 407 C
Refrigerant
C
O
P
24/25
Heat pump with refrigerant R290
Refrigerant HFO-1234ze
New developments on the refrigerant market
are tending towards easy-to-use and efcient
mixtures. A particular emphasis is being placed
on a low GWP. HFO-1234ze represents a
potential substitute for R134a and possesses
virtually identical properties. With a GWP value
of 10, it is one hundred times below that of
R134a and close to natural refrigerants such
as R290. At the same time, HFO-1234ze
permits high condensation temperatures at
low pressure, making it ideal for a variety of
applications. Nevertheless, It is worth noting
that the HFO-1234ze only achieves 75 percent
of the output of the R134a, which may result
in diferent components being used. KWT
is already carrying out research on HFO to
test its suitability as a substitute for existing
applications and as a new refrigerant for the
next generation of heat pumps.
R718 (water) refrigerant of the future?
The use of pure water as a refrigerant is still in
its infancy. Although water has been available
since time immemorial, little is known about
how it acts in a refrigerant circuit. A decisive
factor for high temperatures above 90C is the
low condensation pressure of 1bar, which
necessitates evaporation below this pressure
level. Thus, at an evaporation temperature of
45C, a pressure of around 0.1bar and about
900m
3
/h water vapour would be required.
Today's systems run with less than a tenth of
this volume. The resulting size of water-based
systems means that their production and use
in waste heat applications, for instance, is not
yet feasible.
Services and references
Engineering, service and maintenance
KWT guarantees the components and assemblies in its products will work seamlessly
together, and provides individual support in designing the system right through to
maintenance.
Heat pumps from KWT guarantee efcient and
reliable operation. Following installation, KWT
engineers or Viessmann service companies
commission the system, check its output and
reliability, document all the work and tests
carried out, and instruct the future operators.
As the only heat pump manufacturer in
Switzerland with a complete value chain
within its own company, KWT guarantees the
components and assemblies in its products
will work seamlessly together and provides
individual support in designing the system right
through to maintenance. Outside Switzerland,
these services are provided by Viessmann.
For bespoke KWT heat pumps, a 24-hour
service is available
Service round the clock
Heat pumps designed for specic projects and
other KWT systems can be monitored on a
contractual basis from the KWT control centre.
Any irregularities can be recognised and
remedied in good time via data communication
between the system and the control centre or
contractual partner.
These services are particularly appropriate
for large residential complexes, commercial
and industrial buildings, restaurants, hotels,
and communal facilities such as schools
and swimming pools, etc. This, of course,
also includes dual mode systems, such as a
combination of heat pump plus oil or gas boiler
to cover peak loads.
The results for the user are a high level of
serviceability, top quality and maximum
exibility. Other building services can be
integrated at any time, providing the perfect
nishing touch to the range of services on
ofer.
26/27
Solutions made to measure
KWT special heat pumps are also tested at operating temperature and built according to the
customer's precise specications.
Lotte World II, Korea
(construction started in 2009; projected
completion in 2016)
Heating output installed: 22,200kW
Cooling capacity installed: 20,400kW
Number of heat pumps: 12
Special features:
720 x 200m geothermal probes for 6heat
pumps, river water for the 6other heat pumps;
heating and cooling are largely required at the
same time
Inselspital Bern, Switzerland
Cooling capacity installed: 1552kW
Heating output installed: 1769kW
Number of compressors: 4
Special features:
Primary source provides cooling for operating
theatres, refrigeration cells, etc.; heating and
cooling are required at the same time
Residential complex in Brissago, Lake
Maggiore, Switzerland
Cooling capacity installed: 86.4kW
Electrical output: 33.8kW
Heating output: 120.2kW
Special feature: Heat source is lake water
References
Inntal commercial nursery, Germany
Heating output installed: 1560kW
Cooling capacity installed: 1280kW
Electrical output: 279kW
Special features:
For the primary source there are 3well
systems, each with 90m
3
/h; heat is used to
warm the oor of the greenhouses
Dual mode system with Viessmann boiler
Residential complex, Cologne, Germany
Cooling capacity installed: 56kW
Electrical output: 18kW
Heating output: 74kW
Special feature:
Dual mode system with Vitocrossal300 gas
condensing boiler, 105kW
Lidl distribution centre, Weinfelden,
Switzerland
Cooling capacity installed: 434kW
Electrical output: 201kW
Heating output: 625kW
Special feature:
Heat source is a refrigeration unit
28/29
References
Steca Elektronik, Memmingen, Germany
Cooling capacity installed: 384kW
Electrical output:
Heating output: 484kW
Special feature:
Use of waste heat, energy contracting
Keckeisen Akkumulatoren, Memmingen,
Germany
Cooling capacity installed: 119kW
Heating output: 150kW
Special feature:
Concrete core activation and radiating ceiling
plates, energy contracting
Kiesel GmbH logistics centre, Stockstadt
am Rhein, Germany
Cooling capacity installed: 284kW
Heating output: 382kW
Special feature:
Dual mode system with Vitoplex300 gas
condensing boiler, 1600kW
30/31
Detached houses
Apartment buildings
Industry/commerce/
municipal
Local heating networks
Solar thermal and
photovoltaic
Boilers for oil
up to 116MW heat or
up to 120 t/h steam
Boilers for gas
up to 116MW heat or
up to 120 t/h steam
The comprehensive product range from the Viessmann Group
Individual solutions with efficient systems
The comprehensive range of products and
services from Viessmann ofers individual
solutions with efcient systems for all
energy sources and application areas. As
one of the world's leading manufacturers,
Viessmann ofers intelligent, convenient and
efcient systems for heating, air conditioning/
ventilation, cooling and decentralised power
generation. Viessmann products and systems
are synonymous with the very highest levels of
efciency and reliability.
Our comprehensive product range ofers top
technology and sets new benchmarks. By
focusing on using energy efciently, we can
help cut costs, save natural resources and
protect the environment.
Everything from a single source
The Viessmann range ofers the right products
and systems for every requirement. Our
heating systems can be wall mounted or
oorstanding and are suitable for detached
houses, large residential buildings, commercial
and industrial premises or local heating
networks. Whether for modernisation or new
build, Viessmann is always the right partner for
providing heating, cooling, steam and power.
The wide ranging expertise we have at our
disposal in the Group enables us to provide
our trade partners with perfect solutions. Our
product portfolio is rounded of with a full
range of services.
32/33
The comprehensive Viessmann product range:
Individual solutions with efcient systems for all
energy sources and applications
Heating system
accessories
Heat pumps for brine, water
and air
up to 2MW
Wood combustion technology,
combined heat and power
generation and biogas production
up to 50MW
Maintenance and service
For commissioning, maintenance and
troubleshooting trade partners can always
count on the Viessmann Group to provide
professional support. Our team will be more
than happy to talk to you on the phone or in
person. Our online tools can provide you with
valuable tips, and if necessary spare parts can
be delivered the next morning.
Training
The Viessmann Academy ofers a wide range
of courses, from business management
seminars to technical training, designed to
keep our trade partners abreast of the very
latest developments in our industry.
The product range for all energy sources
and output ranges
Boilers for oil and gas
up to 116MW heat or 120 t/h steam
Combined heat and power generation up to
50MW
el
Heat pumps up to 2MW
Wood combustion technology up to 50MW
Biogas production plants from
18kW
el
to 20MW
gas
Biogas upgrading plants up to 3000m
3
/h
Solar thermal systems
Photovoltaic
Accessories
Refrigeration technology
Refrigeration technology
The company
34/35
Energy Efciency Award 2010
Viessmann Group
Viessmann climate of innovation
Viessmann is one of the worlds leading
manufacturers of intelligent, convenient and
efcient systems for heating, air conditioning/
ventilation, cooling and decentralised power
generation.
As a third generation family run business,
Viessmann has been supplying highly efcient
and clean heating systems for many decades.
A strong brand creates trust
Together with our brand label, our key brand
message is an identifying feature throughout
the world. Climate of innovation is a promise
on three levels: It is a commitment to a culture
of innovation. It is also a promise of enhanced
product benets and, at the same time, an
obligation to protect the environment.
Acting in a sustainable manner
For Viessmann, taking responsibility signies
a commitment to acting sustainably.
This means bringing ecology, economy and
social responsibility into harmony with each
other, ensuring that current needs are
satised without compromising the quality
of life for the generations to come.
We consider climate protection, environmental
responsibility and resource efciency to be
key priorities throughout our company, which
has more than 11,400 employees worldwide.
Example of Best Practice
With its strategic sustainability project,
Viessmann demonstrates at its own head
ofce in Allendorf (Eder) that the energy and
climate policy goals set for 2050 can in fact
be achieved today with commercially available
technology. The results speak for themselves:
Expansion of renewables to 60percent
CO
2
emissions reduced by 80percent
The long-term goal is for the company to
sustainably meet all of its own heating energy
requirements.
The comprehensive product range from
the Viessmann Group for all energy
sources and output ranges
Boilers for oil or gas
Combined heat and power units
Heat pumps
Wood combustion technology
Biogas production plants
Biogas upgrading plants
Solar thermal systems
Photovoltaic systems
Accessories
Refrigeration technology
Company details
Established in: 1917
Employees: 11,400
Group turnover: 2.1 billion
Export share: 55percent
27production companies in 11countries
Sales companies and representations in
74countries
120sales ofces worldwide
2009/2011/2013:
German Sustainability Award for
production, brand, efciency with
resources
Group
KWT Klte-Wrmetechnik AG
Rtimoosstrasse 5
CH-3076 Worb SBB
Telephone +41 31 818 16 16
Fax +41 31 818 16 26
www.kwt.ch
Viessmann Werke GmbH & Co. KG
35107 Allendorf (Eder)
Telephone +49 (0)6452 70-0
Fax +49 (0)6452 70-2780
www.viessmann.com
9443 294 - 3 GB 07/2014
Copyright Viessmann
Duplication and alternative use only with prior written consent.
Subject to technical modications.
Your trade partner: