Energy-saving middle temperature refrigerant/middle temperature refrigerant cascade refrigeration system

Abstract

The invention discloses an energy-saving middle temperature refrigerant / middle temperature refrigerant cascade refrigeration system, which comprises a high-temperature level refrigeration cycle and a low-temperature level refrigeration cycle, wherein heat exchange is carried out by virtue of a condensation evaporator. The high-temperature level refrigeration cycle is additionally provided with a high-temperature level refrigeration branch. The high-temperature level refrigeration cycle and the low-temperature level refrigeration cycle adopt the same middle temperature refrigerant, and share the same evaporator, and switching is realized through the opening and closing of an electromagnetic valve. The cascade refrigeration system disclosed by the invention has the remarkable effects that the refrigeration coefficient is high, cold supply can be realized respectively under the high-temperature level working condition and the low-temperature level working condition, energy can be saved, the operating cost can be lowered, and the use ratio of equipment can be improved.

Description

technical field [0001] The invention relates to the field of environmental simulation test equipment and cold storage refrigeration, in particular to an energy-saving intermediate-temperature refrigerant / intermediate-temperature refrigerant cascade refrigeration system in full-temperature working conditions above -60°C. Background technique [0002] In the vapor compression refrigeration cycle, due to the limitation of the compression ratio of the refrigeration cycle and the thermophysical properties of the refrigerant, the commonly used single-stage compression refrigeration cycle can only obtain a low temperature of -20--40°C. For low temperature, a two-stage compression refrigeration cycle with a medium temperature refrigerant is often used. When a low temperature below -50°C is required, a refrigeration cycle in which a medium temperature refrigerant and a low temperature refrigerant are cascaded is used; the research results of many scholars show that at -40-- In the te...

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