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Ground source heat pumps don't use geothermal energy. "Geothermal heat pump" is a lie.
1. The local ambient ground temperature of a heat pump field is climate dependent. It is #NotGeothermal
2. Heat pumps are not heat engines. Heat pump reservoirs are not useful energy resources.
It should be noted that the amount of "geothermal" energy harvested by a "Geothermal heat pump" depends, to a great degree, on how deep the bore hole is. Here in NYC, boreholes are often 1,200 to 1,500 feet deep. At that depth, there is actually some "geothermal" heat harvested.
How do they work in cooling mode in the summer, then?https://twitter.com/energy_pe/status/938038239251914752 …
In the summer they store solar heat in the relatively cool ground and thus augment the Geothermal energy available in the winter.
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