When avoiding technical details, we usually describe our heat pumps as reverse aircon units. Aircons remove the heat from the air and dispense it without further use. A heat pump does a similar thing but instead of dispensing that heat, the heat is transferred into your pool water. This also means the system does not rely on direct solar radiation, but on outside temperatures, making it equally efficient on cloudy days.
This system is actually a form of solar energy that is also widely advised as an ecological and efficient domestic heating solution. It uses a small amount of electricity to extract heat from the air and transfer it to the water. How is that possible? Well the sun warms the air and that heat is pulled from the air. Even on days without sunshine, this warm air is pulled in, enhanced, and transferred into the water. In order to run efficiently, a minimal temperature of approximately 10ºC is needed. This is very low, meaning your heat pump will still efficiently function on cooler days.
DURATECH® heat pumps utilize the sun’s free heat by collecting and absorbing energy from the outside air and transferring it to your pool water.
Your existing pool pump circulates the water through the heater and warms the pool. The unit contains a fan that draws in outside air and directs it over the surface of the EVAPORATOR (energy collector).
The liquid refrigerant within the EVAPORATOR coil absorbs the heat from the outside air and the refrigerant becomes a gas. The warm gas passes through the compressor where it is compressed to form a very hot gas, which then passes through the CONDENSOR (water heat exchanger). It is here that the heat exchange occurs as the hot gas releases the heat to the cooler swimming pool water circulating through the coil.
The pool water becomes warmer and the hot gas is cooling down as it flows through the CONDENSOR coil, returns to its liquid form and, after passing through the expansion valve, the whole process begins again.