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Ground Source

How does a Ground Source Heat Pump work?

A Ground Source Heat Pump works differently to an Air Source unit, the heat is taken from the ground via pipes which are laid horizontally or vertically.

  1. At the evaporator the heat from the ground is transferred into a heat exchanger to boil off the low temperature, low pressure liquid refrigerant. The action of the water and glycol mixture flowing up and down the pipes in the ground will pick up heat which will then boil off the liquid in the evaporator.
  2. The low temperature, low pressure gas is then compressed in the compressor to turn it into a high temperature, high pressure gas. This is what we use to heat your property and hot water, this gas is then transferred into the condenser.
  3. At the condenser the high temperature, high pressure gas is transferred into a high temperature, high pressure liquid. The action of the water flowing from the heating circuit or hot water cylinder by way of a pump will turn the gas into a liquid.
  4. This liquid then needs to turn back into a low temperature, low pressure liquid so an expansion device is used to throttle back the flow of liquid. The cycle is then completed back at the evaporator to start the process all over again.

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