Ground Source Heat Pumps

GSHPs are connected to a series of pipes called ground collectors, which are buried underground. These pipes can be laid in two configurations:

• Horizontal Trenches: Installed around 1.5 to 2 meters deep.
• Vertical Boreholes: Drilled to depths of approximately 100 meters.

At these depths, the ground maintains a stable temperature of 10-12°C throughout the year.

• Heat Absorption: A water/refrigerant fluid mixture, often referred to as brine, circulates through the ground collectors. As it flows through these underground pipes, the brine absorbs thermal energy from the surrounding earth.
• Circulation to Heat Pump: The warmed brine is then pumped back to the heat pump unit inside the building.
• Compression: Within the heat pump, a compressor increases the temperature of the brine. This step significantly raises the temperature, making the heat suitable for use in the building.
• Heat Exchange: The now-hot fluid passes through a heat exchanger, where its thermal energy is transferred to the building’s heating distribution system. This can include hot water cylinders, radiators, and underfloor heating systems.
• Heat Distribution: The transferred heat is used to provide space heating and hot water throughout the building.
• Fluid Recirculation: After delivering its heat, the fluid passes through an expansion valve, which cools it down before it is circulated back through the ground collectors to absorb more thermal energy from the ground.

By repeating this cycle continuously, GSHPs efficiently utilize the consistent underground temperatures to heat buildings, offering a reliable and sustainable heating solution.

You may be eligible for the government boiler upgrade scheme. This is where a grant of £7,500 can be used to part pay for the installation of your air or ground source heat pump.