| 摘要 |
<p>An integrated heat pump and hot water system having a refrigerant to water heat exchanger (30) that includes first and second refrigerant circuits (41,42) in heat transfer relation with a hot water circuit (40) for circulating water from a storage tank (35)through the heat exchanger (30). One refrigerant circuit (41) is connected between the discharge side of the refrigerant compressor (12) and the heat pump reversing valve (15). The second circuit (42) is connected between the suction side of the compressor (12) and the indoor coil side of the heat pump expansion device (21). A pair of control valves (55,56) are positioned to provide for water heating when the heat pump is in either a heating or cooling mode of operation or, alternatively, when the heat pump is not required to provide air conditioning. In addition, energy in the hot water on the water side of the system is used to evaporate refrigerant in a novel defrost cycle.</p> |
