Alternating high and low temperature test box refrigeration system (-40-150 degrees) is used in single stage refrigeration compressor, if the temperature range (-70-150 degrees) will be using the cascade refrigeration compressor, usually is composed of two parts, respectively, called high temperature and low temperature. The high temperature part uses the medium temperature refrigerant, the low temperature part uses the low temperature refrigerant, and each part is a complete single-stage or two-stage compression refrigeration system. The evaporation of the refrigerant in the high temperature system is used to condense the refrigerant in the low temperature part of the system. The high temperature part and the low temperature part are connected by a condensing evaporator, which is not only the evaporator of the high temperature part, but also the low temperature part of the condenser.
How to adjust the refrigeration unit of the high and low temperature alternating test box?

The change of working condition and the change of working condition, the gas demand is also changed. Usually, the method of gas quantity adjustment is used to unload energy. The main principle is that the suction and exhaust chamber, compressor exhaust directly back to the suction chamber, the suction pressure and discharge pressure is almost the same, the compressor needs only to overcome the suction and exhaust valve spring pre tightening force, can be aspirated into the exhaust.

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