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Commercial refrigeration Compression refrigerating machine's thermal power and temperature fluctuation characteristics
commercial refrigeration Compression refrigerating machine thermal power and temperature fluctuation characteristics
commercial refrigeration Compression refrigerating machine thermal calculation
Two-stage compression refrigerating machine performs cycle thermal calculation, first It is necessary to select the refrigeration working medium and the circulation type, and then determine the working parameters of the circulation, and perform specific calculations according to the aforementioned method. The
two-stage compression refrigerator should use medium temperature refrigerant, because the evaporation pressure in the system cannot be too low at low temperatures, the condensing pressure is not allowed to be too high at normal temperature, and it should be able to liquefy. R717, R22, R290, etc. are usually widely used. The method of
intermediate cooling is closely related to the type of refrigerant used. For refrigerants that are beneficial to heat recovery, such as R290, the use of an intermediate incomplete cooling cycle can also increase the coefficient of performance of the cycle. But in order to reduce the exhaust temperature of the high-pressure stage, a circulation type with complete cooling in the middle can also be used. For refrigerants such as ammonia that are unfavorable to the use of regenerative cycles, a complete cooling cycle should be used. For the two-stage compression cycle with low evaporation temperature, the regenerator is usually added. The main purpose is not to improve the coefficient of performance, but to increase the suction temperature of the low-pressure stage compressor and improve the working conditions of the compressor. The determination of the working parameters of the
two-stage compression cycle is similar to that of the single-stage compression cycle, that is, according to the temperature of the environment medium and the temperature required by the object to be cooled, the heat transfer temperature difference of Sanding is considered to determine the condensation temperature and evaporation temperature of the cycle. . As for the intermediate temperature
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