| 摘要 |
PURPOSE: A heat pump cooling and heating system is provided to enhance the heating efficiency by performing heating operation and hot water generation even under a very low temperature condition. CONSTITUTION: A heat pump cooling/heating system comprise a water tank(1), a first heat exchanger(11), a second heat exchanger(12), a third heat exchanger(13), a compressor(10), pipes(31,41,51,61), a switch valve(15), a first expansion valve(21), a second expansion valve(22), and a fourth heat exchanger(14). The first heat exchanger heats or cools the water of the water tank. The second heat exchanger heat-exchanges with outdoor air. The third heat exchanger heat-exchanges with underground water. The pipes connect the compressor, and the first, the second, and the third heat exchangers to form a refrigerant circulating path. The switch valve switches the circulation direction of refrigerant for the switching between cooling and heating operation. The fourth heat exchanger heat-exchanges the refrigerant flowing toward the second and the third heat exchangers via the first heat exchanger with the refrigerant flowing toward the compressor to collect heat, in heating operation.
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