October 20, 2017
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How Does It Work

During the heating cycle, the ground water, which has circulated through the underground piping system and picked up heat from the soil, is brought back to the heat pump unit inside the house. It then passes through the refrigerant-filled primary heat exchanger. The heat is transferred to the refrigerant, which boils to become a low-temperature vapour. The reversing valve directs the refrigerant vapour to the compressor. The vapour is then compressed, which reduces its volume and causes it to heat up. Finally, the reversing valve directs the now-hot gas to the condenser coil, where it gives up its heat to the air that is blowing across the coil and through the duct system to heat the home. Having given up its heat, the refrigerant passes through the expansion device, where its temperature and pressure are dropped further before it returns to the first heat exchanger to begin the cycle again.

In some systems, a second heat exchanger called "desuperheater" takes heat from the hot refrigerant after it leaves the compressor. Domestic water is pumped through a coil ahead of the condenser coil, in order that some of the heat that would have been dissipated at the condenser is used to heat water.

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