| 摘要 |
PROBLEM TO BE SOLVED: To ensure effective heat change by controlling a refrigerant circulation direction in a heat pump cold/hot water machine using a plate type one as a utilization side heat exchanger and a non-azeotropic mixing refrigerant. SOLUTION: A non-azeotropic mixing refrigerant forms a temperature gradient in a condensation process differing from a case with a single refrigerant. In consideration with this, upon cooling operation a controller 8 controls a four-way valve 5 such that a heat exchange method in a utilization side heat exchanger 4 is a parallel flow upon cooling operation while it is a counter flow upon heating operation. Hereby, even when the utilization side heat exchanger 4 is a plate type one with a refrigerant being a non-azeotropic mixing refrigerant, the same performance can be obtained that of a prior are heat pump cold/hot water machine only with a control method for the four-way valve 5.
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