Ground source heat pumps (GSHPs) take low-grade energy from the ground. They then convert it into usable energy at a higher temperature for space heating and water heating.
The easy way to understand it is that the pump works on the same principle as a refrigerator, but operating in reverse.
The sun heats the ground in the United Kingdom to an average temperature of approximately 12°C. In this sense, GSHPs are actually making use of solar energy and could be considered renewable. But it’s worth bearing in mind that they still require mains power to run the pump.
How does a Ground Source Heat Pump work?
Most domestic installations use closed-loop systems.
This means a system pumps the collector fluid (water and anti-freeze) through a sealed loop. The liquid then draws in warmth from the ground and returns at a higher temperature.
The heat pump compresses the fluid and subsequently the distribution system (typically underfloor heating) absorbs the heat. The system then reduces the pressure by expanding the fluid. This causes the fluid to cool down before it returns to the underground collector and the process starts again.
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Article reference Ultimate Guide to Ground Source Heat Pumps
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