4. THE EXPANSION DEVICE and from ere, now at
normal pressure, it is returned to e evaporator and e
cycle starts again.
Note at during e cooling cycle is process is reversed.
THE HEAT PUMP CYCLE
3. THE CONDENSER where it is surrounded by e pool water.
e heat is given up to e cooler pool water and e now cold
refrigerant returns to its former liquid state but still under high
pressure from e compressor.
This pressure is released by passing e liquid rough –
Coecient of Performance
The eciency of a Heat Pump is usually called its ‘Coecient of
Performance’ – (C.O.P.) which is simply a ratio of heat output to
energy input, bo being expressed in kW. Thus a Heat Pump
absorbing 1 kW of electricity, collecting 4 kW of energy from e air,
and delivering 5 kW of heat to e pool water is said to have a C.O.P.
of 5:1.
Naturally, is ratio will vary according to e temperature of e water
and e ambient air.
1. THE EVAPORATOR collects e heat from e outside
ambient air, pre-heated by e sun. In e Calorex swimming
pool heat pumps, high volumes of outside air are drawn into
e unit by e fan expelled rough e evaporator fins. The
evaporator has liquid refrigerant passing rough it Which is at a
considerably lower temperature an e ambient air. Therefore
e air gives up its heat to e refrigerant which en vaporizes.
This preheated vapour now travels to –
2. THE COMPRESSOR where it is compressed and
upgraded to a much higher temperature. The hot vapour
now enters –
The Calorex Swimming pool heat pump provides ermodynamic
heating by means of a vapour compression cycle, (similar to at
employed in a conventional refrigerator), in addition to acting as an
active solar collector.
HOT GAS
COMPRESSOR
WATER
OUT
CONDENSED
REFRIGERANT
WATER
IN
HIGH PRESSURE SIDE
HEAT
EXCHANGER
EXPANSION
VALVE
COLD LIQUID
REFRIGERANT
LOW PRESSURE SIDE
EVAPORATOR
COOL GAS
AMBIENT AIR
5
SD566252 ISSUE 51
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