heat pumps

The ASHP is sited in the garden or mounted to a structure. It works by using a refrigeration process similar to a domes4c fridge.

At home the back of the fridge is always warm and inside is cold. The heat pump operates in the same way but instead of retaining the cold it expels it by blowing it away using a fan and retains the heat. The heat is then put through a heat exchanger and pumped into the building to provide heating and dhw.

The ambient air temperature is the source of heat to start the refrigeration process. The efficiency of a heat pump fluctuates throughout the year depending on outside air temperature and demand on a property. This can be calculated on system design.

GSHP’s are again a very efficient way of heating a property. Slightly more laborious to install than an ASHP with the advantage is an all year round efficiency.

At 1.2M deep the average ground temperature is approximately 10*c to 12*c. A series of trenches are dug to lay coils of pipe in the ground to extract this heat, OR a series of bore holes are drilled to a set

depth. The heat load of the property will determine how many trenches/bore holes are required. Trenches are specified at 1.2 M deep and the bore hole depth varies on ground make up and heat demand.

The pipes laid in the trenches/bore holes are ran back to a common place called a manifold. This pipework is known as the brine loop and is filled with a heat transfer fluid. The fluid is pumped through the pipework to pick up the heat from the ground (10*c – 12*c). This small amount of heat is passed through the internal unit where the refrigeration process takes place to create the heat for the building.