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display cooler Cascade refrigeration cycle
display cooler Cascade refrigeration cycle
display cooler Thermal calculation of cascade refrigeration cycle can be calculated separately for the high temperature part and the low temperature part. In the calculation, the cooling capacity of the high temperature part is equal to the condensation heat load of the low temperature part plus the cooling loss. The calculation method is the same as the thermal calculation of a single-stage or two-stage compression refrigeration cycle. In the
cascade refrigeration cycle, the intermediate temperature should be determined according to the principle of maximum performance coefficient or approximately equal pressure ratio of each compressor. The former is the most economical for energy utilization, and the latter has a higher utilization rate of the compressor cylinder working volume (that is, a larger air delivery coefficient). Since the intermediate temperature has little effect on the coefficient of performance when it changes within a certain range, it seems more reasonable to determine the intermediate temperature according to the principle of roughly equal pressure ratios at all levels. The size of the heat transfer temperature difference of the
condensing evaporator not only affects the heat transfer area and cooling capacity loss, but also affects the capacity and economy of the entire refrigerator. Generally, the temperature difference is larger, and the area of the condensing evaporator can be smaller, but However, the pressure ratio increases and the circular economy decreases. The lower the temperature of the
refrigerant, the greater the irreversible loss caused by the heat transfer temperature difference. The heat transfer temperature difference of the evaporator is very low and should be a smaller value, preferably not more than 5°C.
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