Direct exchange geothermal heat pump - Wikipedia
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Direct expansion solar assisted heat pumps: A review of applications and recent research - ScienceDirect
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Direct Heating Heat Pump - Guangzhou Canova Heating & Refrigeration Equipment Co., Ltd - page 1.
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Modeling and Analysis of a Direct Expansion Geothermal Heat Pump (DX): Part I-Modeling of Ground Heat Exchanger
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Applications: Tube, Pipe & Fittings: Direct-Exchange Geothermal Heating/Cooling Technology
