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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. Copper in heat exchangers - Wikipedia

    en.wikipedia.org/wiki/Copper_in_heat_exchangers

    Geothermal heat pump technology, variously known as "ground source," "earth-coupled," or "direct exchange," relies on circulating a refrigerant through buried copper tubing for heat exchange. These units, which are considerably more efficient than their air-source counterparts, rely on the constancy of ground temperatures below the frost zone ...

  5. Framingham geothermal program is up and running. There have ...

    www.aol.com/framingham-geothermal-program...

    The geothermal network consists of a mile-long loop that will service about 140 customers, including 24 residential homes, nine income-based apartment buildings and five commercial buildings.

  6. Geothermal Energy Research, Development, and Demonstration ...

    en.wikipedia.org/wiki/Geothermal_Energy_Research...

    The Geothermal Energy Research, Development, and Demonstration Act of 1974 was enacted by the 93rd U.S. Congress on September 3, 1974 (H.R. 14920) to address the critical shortage of environmentally acceptable forms of energy.

  7. Geothermal heating - Wikipedia

    en.wikipedia.org/wiki/Geothermal_heating

    In geothermal heating projects the underground is penetrated by trenches or drillholes. As with all underground work, projects may cause problems if the geology of the area is poorly understood. In the spring of 2007 an exploratory geothermal drilling operation was conducted to provide geothermal heat to the town hall of Staufen im Breisgau.

  8. Heat pump and refrigeration cycle - Wikipedia

    en.wikipedia.org/wiki/Heat_pump_and...

    Thermodynamic heat pump cycles or refrigeration cycles are the conceptual and mathematical models for heat pump, air conditioning and refrigeration systems. [1] A heat pump is a mechanical system that transmits heat from one location (the "source") at a certain temperature to another location (the "sink" or "heat sink") at a higher temperature. [2]

  9. Enhanced geothermal system - Wikipedia

    en.wikipedia.org/wiki/Enhanced_geothermal_system

    Enhanced geothermal system: 1 Reservoir, 2 Pump house, 3 Heat exchanger, 4 Turbine hall, 5 Production well, 6 Injection well, 7 Hot water to district heating, ...