Water/water heat pumps are among the most efficient heating energy systems. The temperature of ground water is a very reliable and constant energy source since its temperature is between 7°C and 13°C. Actual water temperature depends on the location where it is pumped. The ratio between input power and output heat (Coefficient of Performance, or COP) is very favourable in water/water systems, often exceeding the figure of 5, considering the annual average.
One of the key components of AQUAGOR heat pumps is the spiral heat exchanger made of stainless steel that offers excellent protection from corrosion and sedimentation on the heat exchanger walls. Implementation of a AQUAGOR heat pump requires drilling two boreholes into the ground: primary borehole (well) for pumping the water and secondary borehole for returning the water to the ground. Based on experience, optimum distance between the primary and secondary borehole is approximately 15 meters. A part of the energy stored in the water pumped from the ground is recovered and the water is returned to the ground, cooled by 2°C to 4°C, without causing any chemical change to the water whatsoever. Before using water as the primary heat source, a pump test must be conducted to check the amount of water and its quality. Water right permit is required for pumping ground water. |
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Passive cooling
In the AQUAGOR heat pump system, minor adjustments can also be made to allow passive cooling. In this case, relatively low ground water temperature is used to cool the rooms. During passive cooling, the heat pump is not in operation, which allows minimum energy consumption for cooling and thus, compared to conventional air conditioning, much lower electricity bill.
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