| 摘要 |
PROBLEM TO BE SOLVED: To obtain a device for controlling the flow of refrigerant into a water heat exchanger, which is low in the cost and excellent in the mounting property of the device. SOLUTION: A differential pressure valve 14 is provided as the device for controlling refrigerant from an evaporator 4 to conduct the same to flow into the water heat exchanger 13 through an orifice 12 upon heating operation. Upon cooling operation, a solenoid valve 10 is opened to conduct the refrigerant from the evaporator 4 to flow directly into an accumulator 5 whereby a differential pressure will not be generated in the differential pressure valve 14 and the same valve 14 is opened. Upon heating operation, the solenoid valve 10 is closed and high-pressure refrigerant from the evaporator 4 enters the differential pressure valve 14 whereby the differential pressure is generated in the differential pressure valve 14 to open the same valve 14 and the refrigerant from the evaporator 4 is conducted to flow into the water heat exchanger 13 through the orifice 12. The differential pressure valve 14 is inexpensive and, therefore, the cost of the system can be reduced and, further, the size of the valve is small and the valve can be mounted by only inserting the same into a pipeline whereby the mounting property of the same is improved.
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