To provide a combined refrigerating system capable of meeting the necessary cool heat demand by effectively utilizing waste heat from a heat engine, always driving a compression refrigerating machine as a base to get ready for the insufficient discharge of heat from the heat engine and when the waste heat from the heat engine is sufficient, driving a waste heat driven refrigerating machine.
The compression refrigerating machine driven by the heat engine 10 comprises a compressor 12, open/close valves 13 and 15, a condenser 14, and a first evaporator 18. The refrigerating cycle circuit B of the waste heat driven refrigerating machine having a waste heat collector 20, a second evaporator 22, an ejector 24, the compressor 12, and open/close valves 19, 26, and 27, the condenser 14, an expansion valve 28, and a pump 29 and a refrigerating cycle circuit C of the compression refrigerating machine having the compressor 12, the open/close valve 19, a second evaporator 23, an expansion valve 16, and a first evaporator 18 are joined to a refrigerating cycle circuit A. The cooling necessary for the condensation of compression refrigerant in the compression refrigerating machine can be selected from an air cooling by the outside air and a cooling by the waste heat driven refrigerating machine.
OGOSE HIDEMASA
FURUMOTO NAOYUKI
