supermarket refrigerated showcase » article > commercial refrigeration > display cases Two-stage compression refrigeration cycle and cascade refrigeration cycle (2)
display cases Two-stage compression refrigeration cycle and cascade refrigeration cycle (2)
author: supermarket refrigerated showcase category: commercial refrigeration Views: 562Time: 2016-08-22
display cases Two-stage compression refrigeration cycle with incomplete intercooling with one-stage throttling The difference between this cycle and other cycles in the display cases is that the refrigerant is the mainstream After being subcooled by the coil-type intercooler, it is further subcooled by the return heat exchanger; the refrigerant vapor from the evaporator is superheated by the return heat exchanger, and then enters the low-pressure compressor for compression, so the suction of the low-pressure compressor The gas has a large degree of superheat; the exhaust gas of the low-pressure stage compressor is mixed with the vapor from the intercooler to be cooled, so the exhaust gas of the low-pressure stage is not completely cooled to a saturated state. The suction of the high- and low-pressure compressors of this system has a large degree of superheat, so this system is only suitable for refrigerants with relatively small superheat loss, and must not be used in ammonia refrigeration systems. display cases Although cascade refrigeration two-stage compression refrigeration can reach a lower evaporation temperature than single-stage compression refrigeration, it is limited by the physical properties of the refrigerant and the compressor's operating characteristics. Generally, when the evaporation temperature is lower than -70°C, it is difficult to use a single medium-temperature refrigerant cycle or a low-temperature refrigerant cycle. However, if the artificial refrigeration method can be used to provide a cold source for the condensation process of the low-temperature refrigerant cycle, and reduce the condensation temperature and pressure, it can work well. That is to say, although the refrigeration device using low temperature refrigerant can produce very low temperature, it cannot work alone and needs to be operated in conjunction with another refrigeration device. This is cascade refrigeration. The above articles are from refrigerated showcase display cases and walk-in cooler. For details, please log in: www.ihdjx.com Free Order Hotline: +86 18019567573 Contact: Mr. Shao 26066250@qq.com
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