Heat Pumps Made Simple
Heat Pumps are being used extensively to provide heat to buildings as well as pools in a cost effective manner. A heat pump in essence behaves like air conditioning but in the opposite direction. Instead of cooling down your house and getting rid of excess heat to a radiator and external fan unit, a heat pump cools down the external air and pump that heat directly into your swimming pool or house. The laws of energy conservation mean that you get out more energy than you pay for because heat is transferred from the air (or ground) into your house along with the energy you use to drive the system in the first place.
What this means is that if you compare the cost of heat provided by a heat pump with the unit cost of heat provided directly by an electric heater, you can frequently achieve improvements of 250% or even more. For space heating then, heat pumps offer a cost effective solution which means that your overall energy costs can be cut with much of the heat you use actually being provided by the ground or by the outside air.
There are two main types of heat pump: GSHP or ground source heat pumps which extract warmth from the ground via an array of underground pipes, and air source heat pumps which extract heat from air that is fanned over a heat exchanger with a fan. Air source heat pumps are usually the easier to install and today are very quietquite quiet}. They operate even down to below zero temperatures.
GSHP or ground source heat pumps rely on a series of underground pipes which contain a pumped working fluid that enters the pipes cold, having given up its heat to your home, and then warms up to the surrounding ground temperature as it circulates. 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 efficiency during very cold weather. The underground pipes can be laid horizontally or vertically via a deep bore and essentially extract geothermal heat 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 very efficiently.
When choosing 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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