Heat source
There are essentially three heat sources that heat
pumps can derive energy from. air, soil and
groundwater. Air heat pumps have the advantage
that air as a source heat is available everywhere in
unlimited
quantities that can be used
free of
charge
. A disadvantage is that the outside air is at
its coldest when the heat requirement is greatest.
Brine heat pumps extract energy from the soil. This
is undertaken in serpentine pipe networks which
are laid approx. 1m deep or placed by means of
drilling. The disadvantage is the
large space
requirements
for the serpentine pipe networks or
the
high cost of drilling
. A long-term cooling of
the soil is also a possibility.
Water heat pumps require
two wells
in order to
obtain heat from the groundwater, one supply well
and one dry well. The development of this source
is not possible everywhere, it is expensive and
requires planning permission.
Function of the heat pump
A heat pump is a device which makes use of a
working medium to absorb ambient heat under low
temperatures and transports this heat to a place
where it can be of use for heating purposes. Heat
pumps work according to the same principles as a
refrigerator. The difference is that heat, the by-
product of the refrigerator, is the goal of the heat
pump.
The main components of the cooling circuit consist
of an evaporator, a compressor, a condenser and
an expansion valve. In a finned evaporator,
the refrigerant evaporates both because of lower
pressure and because of lower heat-source tem-
peratures through absorption of energy from the
environment. In the compressor, the refrigerant is
brought to a higher pressure and temperature by
the application of electrical energy. Next, the hot
refrigerant gas reaches the condenser, a plate
heat-exchanger. Here the hot gas condenses,
transferring heat to the heating system. The lique-
fied refrigerant then expands and cools in a flow
regulator, the expansion valve. Then the refrig-
erant flows into the evaporator once more and the
cycle is complete.
For control, a Smart-Control is included which
ensures the independent operation of all safety
devices. The water-circulation system of the Series
WKF consists of a circulation pump, plate heat-
exchangers, dirt traps, safety valve, a manometer,
fill- and drain valves, an automatic air-bleeder and
flow switch. The WKF-compact series has, in addi-
tion, a 3-way changeover valve and a domestic hot
water storage.
Wall- and floor consoles, condensate pans, con-
densate tray with heating, a 3-way changeover
valve, a overflow protection valve and other sen-
sors are available as accessories.
3
1
A
B
C
2
4
D
Fig. 52: Functional diagram heating inverter heat pump
A: Outdoor area
B: Indoor area
C: Heating pump outdoor module
D: Heating pump indoor module
1: Condensing
2: Evaporation
3: Decompression
4: Liquefying
REMKO WKF / WKF-compact
46
Summary of Contents for WKF -compact Series
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