Air source heat pump
See also Heat pumps.
Air source heat pumps use the difference in temperature between the outside and internal air to provide space heating or cooling to a building.
An air source heat pump has three main parts:
- the evaporator coil absorbs heat from the outside air
- the compressor pumps the refrigerant through the heat pump and compresses the gaseous refrigerant to the temperature needed for the heat distribution circuit
- the heat exchanger transfers the heat from the refrigerant to air or water.
The benefits of air source heat pumps are that they do not require the use or storage of external fuel. Instead they run on electricity, which eliminates the need for a gas connection or storage of oil/solid fuel. Air source heat pumps present an advantage over ground source heat pumps because they require less space to install. Instead of requiring the installation of buried underground coils, air source systems can be fitted using much less space and are therefore, more suited for an urban home.
It is even possible for air source heat pumps to extract useful heat from air at temperatures as low as minus 15oc ? though the usual lowest operating temperature is 5oc.