Air Source Heat Pump Heat

And atmospheric air is free and open to the public, there are several problems associated with its use as a source of heat. In more humid climate, some residual frost tend to accumulate in the open heat exchange coil, as the temperature falls below a 2-5VC range, leading to a reduction of the heat pump. Coil defrosting can be achieved by reverse cycle heat pump or other, less efficient means. This leads to low energy penalty, because during defrost cool air circulating in the building. Subject to the defrost cycle is short, this is not essential. In addition, for the thermodynamic considerations for capacity and performance of the heat pump fall in any case, with decreasing temperature. As the load on the heating is greatest at this time, an additional heating source is required. This device can be an existing oil, gas or electric furnace or electric resistance heating; the latter, as a rule, part of the heat pump system. An alternative to the provision of additional heating device to make sure that the power of heat pump enough to cope with the most extreme weather conditions. This can result in over-the-block size on a high additional capital expenditure and is not cost effective in comparison with the cost of additional heating devices.

Exhaust ventilation air is a common source of heat for heat pumps in the residential and commercial buildings. Heat pump takes heat ventilation air and provides water and/or space heating. Time of continuous operation of the ventilation system is required in the heating period or within one year. Some rooms are also used and the exhaust air and atmospheric air. For large buildings exhaust air heat pumps are often used in combination with air-to-air heat recovery system.

Outside ambient air is the most interesting sources of heat, as far as existence is concerned. Unfortunately, when the space heating load high temperature low. However, temperature is not stable. The COP vapor-compression heat pumps is reduced by reducing the cold temperature of the source. In addition, in the evaporator temperatures below 5VC humidity on the evaporator surface in the form of ice. This not only improves heat transfer and leads to a reduction of the working fluid temperature, and therefore less COP values, depending on the temperature of the air flowing through the evaporator. If ice formation occurs periodic icing evaporator surface should be applied. This invariably leads to a decrease in the value of the common system of the COP.

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