1.1 FUNCTION
The Calorex Swimming pool heat pump provides thermodynamic heating
by means of a vapour compression cycle, (similar to that employed in a
conventional refrigerator), in addition to acting as an active solar collector.
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
4kW of energy from the air, and delivering 5kW of heat to the pool water is
said to have a C.O.P. of 5:1.
This ratio will vary according to the temperature of the water and the ambient
air.
THE HEAT PUMP CYCLE
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 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 vaporises.This preheated
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 cooler
refrigerant returns to its former liquid state but still under high
pressure from the compressor. This pressure is released by passing
liquid through-
1. THE COMPRESSOR
where it is
compressed and upgraded to a much
higher temperature. The hot vapour now
enters-
4. THE EXPANSION DEVICE
and from there, now at
normal pressure, it is returned to the evaporator and
the cycle starts again.
NOTE THAT WHEN A HEAT PUMP IS CHILLING THE CYCLE IS REVERSED
POOL
WATER OUT
POOL
WATER IN
HOT GAS
HEAT
EXCHANGER
CONDENSED
REFRIGERANT
HIGH PRESSURE SIDE
COMPRESSOR
EXPANSION
VALVE
LOW PRESSURE SIDE
COOL LIQUID
REFRIGERANT
AMBIENT
AIR
COOL GAS
EVAPORATOR
1
2
3
4
6
SD638152 ISSUE 4
PPT16/22 BHC & PPT16BMCY OWNER INSTALLATION MANUAL
