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vertical installation - open wellIn this type of installation, two boreholes are typically drilled water is extracted from one well and returned to the other. This allows for larger volumes of water to be pumped without altering the ground water level. The borehole can be used for both the domestic water supply and the heat pump. This is a highly efficient method of heat extraction when using a heat pump. Typically water is extracted at 12C and returned at 7C. Flow Rates
Regardless of whichever option is used, it is imperative that the well is supplied with an adequate flow rate of water. The flow rate required is determined by the heat pump size. As an example, a 10kW heat pump requires a minimum flow rate of 1700 litres per hour.
The minimum distance between the hot and cold well should be 15 metres. The water needs to be clean and should be filtered before entering the heat pump.
NB. Limestone tends to clog up the filters.
If you're opting for an open well system, it's vital that you have your water tested before installation. This should be carried out by your closest water testing facility. Click here for a document outlining the list of elements for which your water should be tested.
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Invisible Heating Systems, IHS Design Centre, Morefield Industrial Est, Ullapool, IV26 2SR
Tel: 01854 613161 Email: design@invisibleheating.co.uk | ||
