Ground-source heat pumps extract latent heat from the ground via a borehole or net work of underground pipes. The heat is transferred to a mix of water and antifreeze carried in the pipes and then converted,through the heat pump, into thermal energy for heating hand hot water. Technically this is not renewable energy, as electricity is needed to power the pump, but that electricity amounts to one-third of the total energy produced, so the excess could be termed renewable. The pump can also be powered by solar energy or another renewable form.
underground pipes
use it for heating hand hot water
For Example
This home sits on a bluff overlooking rolling sagebrush meadows in Oregon’s High Desert with views of the Cascade Mountains dominating the western horizon. The request for a net zero house necessitated extensive use of photovoltaic panels, ground source heat-pumps, careful consideration of day lighting and shading strategies, and a super-insulated structure.
Advantages
- System is easy to maintain and lasts at least twenty years.
- Lower running costs than oil, liquid petroleum gas, coal and electric heating system.
Disadvantages
- The temperature generated - 50℃ is too low for a regular radiator to heat a room. Heat pumps work better with underfloor heating, which can achieve room temperatures of 25-28℃ from water temperatures of 45-65℃.
- Can be installed only where the ground is suitably soft for digging a trench or borehole.
- Higher running costs than mains gas heating.
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