COOL GAS
HOT GAS
HEAT
EXCHANGER
EVAPORATOR
COLD LIQUID
REFRIGERANT
HIGH PRESSURE SIDE
CONDENSED
REFRIGERANT
AMBIENT
AIR
LOW PRESSURE SIDE
WATER OUT
WATER IN
1
2
3
4
COMPRESSOR
EXPANSION
VALVE
THE HEAT PUMP CYCLE
The CALOREX Swimming Pool Heat Pumps provides thermodynamic heating
by means of a vapour compression cycle, (similar to that employed in a
conventional refrigerator), in addition to operating as an active solar collector.
2
The
COMPRESSOR
where it is compressed and upgraded
to a much higher temperature. The hot vapour now enters -
1
The
EVAPORATOR
collects the heat from the outside ambient air,
pre-heated by the sun. In the Calorex swimming pool heat pumps, high
volumes of outside air are drawn into the unit by the fan and expelled
through the evaporator fins. The evaporator has liquid refrigerant passing
through it which is at a considerably lower temperature than the ambient
air. Therefore the air gives up its heat to the refrigerant which then
vaporizes. This pre-heated vapour now travels to -
3
The
CONDENSER
where it is surrounded by the pool water.
the heat is given up to the cooler pool water and the now cold
refrigerant returns to its former liquid state but still under high
pressure from the compressor.
This pressure is released by passing the liquid through -
4
The
EXPANSION DEVICE
and from there, now at normal
pressure, it is returned to the evaporator and the cycle starts
again.
COEFFICIENT OF PERFORMANCE
The efficiency of a Heat Pump is usually called its ‘Coefficient of Performance’
- (C.O.P.) which is simply a ratio of heat output to energy input, both being
expressed in kW. Thus a Heat Pump absorbing 1 kW of electricity, collecting 4
kW of energy from the air, and delivering 5 kW of heat to the pool water is said
to have a C.O.P. of 5:1.
Naturally this ratio will vary according to the temperature of the ambient air.
NOTE THAT WHEN A HEAT PUMP IS CHILLING THE CYCLE IS REVERSED
6
SD331852 ISSUE 7
OWNER INSTALLATION MANUAL 634ACH/ACL/AHC /1222AC/1234BC/BHC /1834BHC /PP22BC
