摘要 |
<P>PROBLEM TO BE SOLVED: To provide a refrigeration device which can surely carry out highly reliable defrosting operation in a short period of time without stopping the defrosting operation due to abnormality by suppressing the abnormal increase of refrigerant pressure during the defrosting operation. <P>SOLUTION: The refrigeration device includes: a high-temperature side cycle device 10 for circulating a high-temperature side refrigerant by a high-temperature side compressor 11; a low-temperature side cycle device 20 which connects a low-temperature side compressor 21, a low-temperature side intermediate cooler 26, a low-temperature side condenser 22, a first low-temperature side diaphragm device 23, and a low-temperature side evaporator 24 through piping to circulate a low-temperature side refrigerant, and which includes a low-temperature four-way valve 25 and a second low-temperature side diaphragm device 27 between the low-temperature side intermediate cooler 26 and the low-temperature side condenser 22; and a cascade condenser 30 for performing heat exchange between the high-temperature refrigerant and the low-temperature refrigerant; and a control means 40 for executing control to condense, during the defrosting operation, the low-temperature side refrigerant in the low-temperature side evaporator 24 and the low-temperature side condenser 22, reduce the pressure of the low-temperature side refrigerant in the second low-temperature side diaphragm device 27, and evaporate the low-temperature side refrigerant in the low-temperature side intermediate cooler 26. <P>COPYRIGHT: (C)2012,JPO&INPIT |