Supermarket refrigerated showcase single-stage vapor compression refrigeration cycle (2)
supermarket refrigerated showcase single-stage vapor compression refrigeration cycle actual supermarket refrigerated showcase The theoretical cycle of the refrigerator cycle ignores some of the existence of subcooling, overheating, regenerative heat exchange and resistance Practical factors are therefore practically impossible. After considering the actual factors, the actual pH diagram of the refrigeration cycle will become very complicated. The state change process 1-2-3-4 in the figure is an ideal situation, and the actual situation is 1-1-l-2s-2s'3一3'-4'1. Among them, the process 4' -1 indicates that there is a pressure reduction process when the refrigerant evaporates in the evaporator, and 1-1 indicates 2.2.2 The condensation temperature (or condensation pressure) of the two-stage compression and cascade refrigeration refrigeration system is determined by the cooling The temperature of the solvent, and the evaporation temperature (or evaporation pressure) depends on the refrigeration requirements. Therefore, in many practical applications, (tk-to) or pk/po is very large. The problems caused by the compression ratio pk/po of are too large as follows. (1) The overheating loss and throttling loss are large, resulting in a decrease in the refrigeration coefficient. (2) The cooling capacity per unit volume is reduced, which will inevitably require a larger compressor. (3) The exhaust temperature rises, resulting in a decrease in the viscosity of the compressor lubricant, a decrease in the lubrication effect, and an increase in power consumption. (4) causes the compressor volumetric efficiency to decrease. When the compression ratio reaches about 20, the volumetric efficiency of the reciprocating compressor is close to zero, that is, the compressor cannot suck in gas. In order to reduce the influence of the problems existing in refrigeration under the conditions of the above-mentioned large compression ratio ' generally, a multi-stage compression refrigeration cycle or a cascade refrigeration cycle can be used when the temperature is below -40°C. The above articles are from refrigerated showcase supermarket refrigerated showcase and display cases. For details, please log in: www.ihdjx.com Free Order Hotline: +86 18019567573 Contact: Mr. Shao 26066250@qq.com
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