Energy from the sun that is stored in the earths surface can be used to heat your building efficiently and effectively via the use of ground source heat pumps. The energy is gathered by a collector, which normally consists of pipework laid either horizontally or vertically in the ground, containing a glycol or brine mixture to avoid freezing at low temperatures. This low grade heat energy is used to warm the liquid refrigerant, inside the GSHP unit, which boils at very low temperatures and expands into a gas. This gas is then compressed in the unit and it gives up its high grade heat energy into the building’s heating system. As is does so this hot gas is cooled and condenses back into its liquid form and the whole cycle start again. Optimum performance depends on a variety of factors including the design of the collector system and the ground that it is buried in, the sizing of the GSHP unit and the design of the heating distribution system. Lower temperature heating systems such as under-floor heating allow GSHPs to operate at a higher efficiency than traditional radiator systems. At JKN Renewables we take great pride in designing systems for optimum overall performance and for this reason we like to take the “whole system approach” and at very least advise on the best type of heating distribution system (emitter) and collector requirements. We also like to get involved in more complex GSHP systems where “free” cooling can be provided as a by-product of hot water production and where energy recovered from outgoing ventilation air is used to increase system performance. We are an independent provider of GSHPs from a range of high quality manufacturers such as NIBE, Thermia, Danfoss, Dimplex, Vaillant and Stiebel Eltron.