Patent ID: 10330556

Abstract:
An environmental testing apparatus includes a chamber, a cooling unit including a cooling apparatus of a brine that cools the inside of the chamber, a heating unit and a control apparatus. The cooling apparatus includes: a high temperature side cooling circuit including a high temperature side compressor, condenser, high temperature side expansion valve and cascade condenser connected in this order to circulate a high temperature side heating medium; and a low temperature side cooling circuit including a low temperature side compressor, cascade condenser, low temperature side expansion valve and evaporator connected in this order to circulate a low temperature side heating medium. The low temperature side heating medium is cooled by the high temperature side heating medium in the cascade condenser, while the brine is cooled by the low temperature side heating medium in the evaporator. The control apparatus controls a temperature inside the chamber to between −67.5° C. and 127.5° C.