<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">geothermal heat pumps</topic></authority><related type="broader"><topic>heat pumps</topic></related><variant type="other"><topic>ground-source heat pumps</topic></variant><variant type="other"><topic>pumps, geothermal heat</topic></variant><variant type="other"><topic>GHPs</topic></variant><variant type="other"><topic>GSHPs</topic></variant><variant type="other"><topic>geothermal heat pump</topic></variant><variant type="other"><topic>ground source heat pumps</topic></variant> <note xml:lang="en"><![CDATA[ A geothermal heat pump (also known as a ground-source heat pump) transfers energy from the ground as a component of heating, cooling, and water-heating systems. A collector hose filled with a carrier fluid (water or a combination of water and antifreeze) is installed in a borehole which is drilled into a geothermal aquifer. In colder months, this circulating carrier fluid absorbs heat from the surrounding bedrock, which is then extracted by the heat pump for use in space-heating via piping connected to the heat exchanger. During the warmer months the process is reversed: heat from the air is transferred to the heat exchanger and into the fluid. As it moves through the pipes, the heat is dispersed to the rocks, soil, and groundwater. ]]></note></mads>