ASHP and GSHP Heat Pumps Made Simple
Heat Pumps are now being used widely to provide heat to buildings as well as swimming pools in a low cost manner. A heat pump in essence behaves like AC but in the opposite direction. Rather than cooling down your house and shedding excess heat to a radiator and fan unit outside, a heat pump will cool down the outside air and pump that heat instead into your swimming pool or house. The physics of energy conservation mean that you get out more energy than you pay for because heat is pumped from the ground or air) into your house along with the energy you use to drive the pump in the first place.
This means that if you compare the unit cost of energy produced by a heat pump with the unit cost of heat delivered directly by an electric heater, you can frequently get improvements of 300% or even more. For space heating then, heat pumps thus offer a highly cost effective solution which means that your overall energy costs can be slashed with much of the heat you use actually being provided by the surrounding outside air or geothermally.
There are 2 main types of heat pump: ground source heat pumps which extract geothermal warmth from the ground via a network of underground pipes, and ASHP or air source heat pumps which get heat from air that is blown over a heat exchanger with a fan. ASHP pumps are usually the easier to install and nowadays are quite quiet}. ASHP pumps operate even down to below zero temperatures.
Ground source heat pumps rely on a series of underground pipes which contain a pumped fluid that enters the pipes cold, having given up its heat to your home, and then warms up to the ground temperature as it flows through the system. Once warm again it enters the heat pump and gives off its heat again to repeat the cycle.
GSHPs are less easy to install than air source heat pumps but have the advantage of operating at slightly higher efficiencies during cold weather. The underground pipes can be laid vertically via a deep bore hole or horizontally and essentially extract geothermal energy from the ground. This energy is always present at a low level but in conjunction with efficient heat pump technology it can be extracted and used to heat houses or pools highly effectively.
When selecting a heat pump you also need to select a good quality heat pump installer and it pays to use a firm that has a lot of experience and is professionally qualified.
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