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  2. 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 ...

  3. 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.

  4. Heat pump - Wikipedia

    en.wikipedia.org/wiki/Heat_pump

    A ground source heat pump (also geothermal heat pump) is a heating/cooling system for buildings that use a type of heat pump to transfer heat to or from the ground, taking advantage of the relative constancy of temperatures of the earth through the seasons.

  5. First Philippine Holdings Corporation - Wikipedia

    en.wikipedia.org/wiki/First_Philippine_Holdings...

    Its power generation subsidiary, First Gen Corporation (First Gen), is a renewable energy producer, with power plants that use geothermal, hydro, and natural gas for fuel. Today, it has a total installed capacity of 2,832.6 MW, or 18.2% of the country's total installed capacity.

  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. Geothermal energy in the United States - Wikipedia

    en.wikipedia.org/wiki/Geothermal_energy_in_the...

    The Sonoma Calpine 3 geothermal power station of The Geysers. Geothermal energy in the United States was first used for electric power production in 1960. The Geysers in Sonoma and Lake counties, California was developed into what is now the largest geothermal steam electrical plant in the world, at 1,517 megawatts. Other geothermal steam ...

  8. Dandelion Energy - Wikipedia

    en.wikipedia.org/wiki/Dandelion_Energy

    Dandelion is an American geothermal heating supplier in the Northeast United States. [1] Prior to 2017, the company was part of Google X, before turning into an independent company. [2] Dandelion targets providing geothermal heating and cooling (HVAC). The system consists of a heat pump that pipes energy to or from a house. [3]

  9. Aquifer thermal energy storage - Wikipedia

    en.wikipedia.org/wiki/Aquifer_thermal_energy_storage

    Shallow (<400 m) geothermal installations' legal status is diverse among countries. [14] Regulations for installations concern the use of hazardous materials and proper backfilling of the borehole to avoid hydraulic short circuiting between aquifers. Other regulations concern protection of groundwater areas for potable water. [15]