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  2. Closed-loop geothermal - Wikipedia

    en.wikipedia.org/wiki/Closed-loop_geothermal

    Closed-loop geothermal systems (also known as “advanced geothermal systems” or “AGS”) are a type of engineered geothermal energy system containing subsurface working fluid that is heated in a hot rock reservoir without direct contact with rock pores and fractures.: [1] [2] [3] Instead, the subsurface working fluid stays inside a closed loop of deeply buried pipes that conduct Earth’s ...

  3. Ground-coupled heat exchanger - Wikipedia

    en.wikipedia.org/wiki/Ground-coupled_heat_exchanger

    It is therefore clear that the use of EAT [Earth Air Tunnel] not only helps save the energy but also helps reduce the air pollution by reducing bacteria and fungi.” [3] Likewise, Flueckiger (1999) in a study of twelve earth-air heat exchangers varying in design, pipe material, size and age, stated, “This study was performed because of ...

  4. 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.

  5. Downhole heat exchanger - Wikipedia

    en.wikipedia.org/wiki/Downhole_heat_exchanger

    It is used to capture or dissipate heat to or from the ground. DHT's are used for geothermal heating, sometimes with the help of a geothermal heat pump. Downhole heat exchangers, like other use of geothermal energy, have the potential to significantly contribute to the reduction of CO 2 emissions. [2] In northern Europe, DHE are already widely ...

  6. AC is hard on the planet. This building has a sustainable ...

    www.aol.com/ac-hard-planet-building-sustainable...

    At 1 Java Street, construction crews are drilling 320 holes, each around 4 inches in diameter and 499-feet deep, to create the building’s geothermal piping system through which the water will be ...

  7. Geothermal heating - Wikipedia

    en.wikipedia.org/wiki/Geothermal_heating

    In 2004 more than half of direct geothermal heat was used for space heating, and a third was used for spas. [1] The remainder was used for a variety of industrial processes, desalination, domestic hot water, and agricultural applications. The cities of Reykjavík and Akureyri pipe hot water from geothermal plants under roads and pavements to ...

  8. Glossary of geothermal heating and cooling - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_geothermal...

    A plastic pipe assembly consisting of 2 lengths of plastic pipe (HDPE or PEX-a) joined at one end by a molded plastic U-bend. The U-tube is inserted into a vertical or horizontal borehole. In most cases bentonite and/or cement grout fills the annular space inside the borehole around the U-tube piping.

  9. Polybutylene - Wikipedia

    en.wikipedia.org/wiki/Polybutylene

    One example is the installation of PB-1 pipes in the Vienna Geothermal Project (1974) where aggressive geothermal water is distributed at a service temperature of 54 °C and 10 bar pressure. Other pipe materials in the same installation failed or corroded and had been replaced in the meantime. [8]

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