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The warm gas inside the coil passes through the COMPRESSOR, which concentrates
and increases the heat to form a very hot gas, which then passes through the
CONDENSER (water heat exchanger). It is here that the heat exchange occurs as the
heat from the hot gas is transferred to the cool swimming pool water circulating through
the heat exchanger.
The pool water becomes warmer and the hot gas returns to its liquid form as it flows
through the CONDENSER coil. The gas then passes through the Electronic Expansion Valve
and the whole process begins again.
Developments in heat pump technology mean that today heat pumps can efficiently
collect heat from the outside air even when the temperature is as low as 7-10°C. This
means that for tropical and subtropical climates the pool can be maintained between 26°C and 32°C.
3.2 Air source heat pump working principle
