Air source heat pumps work on the same basic principles as a refrigerator but in reverse, taking heat from the air compressing it and converting it into usable heat for the home.
A heat pump typically consists of four main components:
- Expansion valve
How it works
In an air source heat pump, outside air is drawn over the evaporator. The refrigerant absorbs heat from the air and changes from a liquid to a vapour.
The refrigerant then passes through a compressor, increasing the pressure and consequently the temperature of the vapour. This higher temperature is now suitable for domestic heating
The higher temperature refrigerant then passes through the condenser heat exchanger, transferring heat to the heating system. With the heat now removed, the refrigerant returns to liquid. The liquid refrigerant then passes through the expansion valve, returning the refrigerant to its original state ready to repeat the cycle. A heat pump typically consists of four main components; evaporator, compressor, condenser and expansion valve.