ORNL is researching innovative methods of constructing geothermal heat pumps. (See this article, with lots of quotes from me...)https://www.knoxnews.com/story/news/2020/02/04/oak-ridge-national-lab-scientists-make-geothermal-battery-homes/4602129002/ …
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You blame
@ENERGY for your false claims,@bobwyman? Ground source heat pumps don’t use solar energy, they use electricity. Ambient local ground temperature is climate dependent. It’s the source/sink for a reversible heat pump cycle, not the useful energy resource.#Thermodynamics
You clearly misunderstand how ground source or geothermal heat pumps work. For a GHP with COP=3.5, when used to heat, one unit of electricity is used to produce 3.5 units of thermal energy. The 2.5 units of non-electric energy is mostly solar thermal energy stored in the ground.
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