| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cold and hot heat supply system configured to allow a working fluid and a refrigerant to always flow in counter directions by the arrangement of valves in view of a problem of heat exchange efficiency degradation because the refrigerant and the working fluid flow in parallel in a heat exchanger when switching the flow of the refrigerant by a conventional four-way valve, in the heat exchanger in which the refrigerant and the working fluid in the exchanger flow in parallel. Ž<P>SOLUTION: An inlet and an outlet of the compressor 100 are provided with two three-way valves 810, 820 or four on-off valves to switch the flow of the refrigerant, and piping is arranged to also switch the flow of the refrigerant to the refrigerant inlets of two heat exchangers 300, 500. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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