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  2. Direct exchange geothermal heat pump - Wikipedia

    en.wikipedia.org/wiki/Direct_exchange_geothermal...

    DX system being drilled in the 1980s. A direct exchange (DX) geothermal heat pump is a type of ground source heat pump in which refrigerant circulates through copper tubing placed in the ground unlike other ground source heat pumps where refrigerant is restricted to the heat pump itself with a secondary loop in the ground filled with a mixture of water and anti-freeze.

  3. Ground source heat pump - Wikipedia

    en.wikipedia.org/wiki/Ground_source_heat_pump

    The direct exchange geothermal heat pump (DX) is the oldest type of geothermal heat pump technology where the refrigerant itself is passed through the ground loop. Developed during the 1980s, this approach faced issues with the refrigerant and oil management system, especially after the ban of CFC refrigerants in 1989 and DX systems now are ...

  4. International Ground Source Heat Pump Association - Wikipedia

    en.wikipedia.org/wiki/International_Ground...

    Established in 1987, the International Ground Source Heat Pump Association (IGSHPA) is a nonprofit, membership-based organization that promotes geothermal heat pump technology. It was a outreach unit of the College of Engineering, Architecture and Technology (CEAT) at Oklahoma State University until 2020. In June 2020, the OSU Board of Regents ...

  5. Renewable energy commercialization - Wikipedia

    en.wikipedia.org/wiki/Renewable_energy...

    The heat can also be used for industrial process applications or as an energy input for other uses such as cooling equipment. [69] In many warmer climates, a solar heating system can provide a very high percentage (50 to 75%) of domestic hot water energy. As of 2009, China has 27 million rooftop solar water heaters. [70]

  6. Geothermal heating - Wikipedia

    en.wikipedia.org/wiki/Geothermal_heating

    Heat pipes extend the temperature range down to 5 °C (41 °F) as they extract and "amplify" the heat. Geothermal heat exceeding 150 °C (302 °F) is typically used for geothermal power generation. [6] In 2004 more than half of direct geothermal heat was used for space heating, and a third was used for spas. [1]

  7. Heat pump - Wikipedia

    en.wikipedia.org/wiki/Heat_pump

    Specifically, the heat pump transfers thermal energy using a heat pump and refrigeration cycle, cooling the cool space and warming the warm space. [1] In winter a heat pump can move heat from the cool outdoors to warm a house; the pump may also be designed to move heat from the house to the warmer outdoors in summer.

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