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Supermarket refrigerated showcase with economizer secondary throttling refrigeration system
author: supermarket refrigerated showcase category: walk-in display coolers Views: 586Time: 2016-08-22
supermarket refrigerated showcase with economizer secondary throttling refrigeration system
supermarket refrigerated showcase with economizer secondary throttling refrigeration system, supermarket refrigerated from accumulator D The showcase refrigerant liquid flows into the economizer E through the throttle valve Gi, and the flash gas generated in the upper part enters the elementary volume in the compression stage through the gas supplement, and is mixed with the original gas to continue to be compressed. After the lower liquid is throttled for the second time by the throttle valve G2, it enters the evaporator F for refrigeration. The refrigerant liquid entering the evaporator undergoes a secondary throttling, and the temperature before the secondary throttling is the same as the temperature of the gas entering the air supplement port. Whether it is the primary throttling or the secondary throttling, the refrigerant entering the evaporator is supercooled, so the refrigeration capacity of the supermarket refrigerated showcase increases. At the same time, air supplementation increases the gas quality in the element volume and the compression work to a certain extent, but the increase rate is slower than the increase in refrigeration capacity, so the refrigeration coefficient is improved, which has the effect of energy saving. The energy-saving effect of
is related to the nature and working conditions of the refrigerant in the supermarket refrigerated showcase. R502 is the best, followed by R12 and R22, and R717 is the smallest. The energy saving effect under low temperature conditions is very significant. When the condensing temperature remains unchanged, the lower the evaporation temperature, the more the refrigeration coefficient of the cycle increases. According to related literature, for the low temperature working conditions with the evaporation temperature of -15~-40℃, the cooling capacity can be increased by 19%~44%, and the refrigeration coefficient can be increased by 7%~30%. In addition, the screw chiller with economizer has wider operating conditions, the single-stage pressure ratio is large, and the best operation can be achieved when unloading operation: the processing is basically the same as that of the single-stage screw, and the valves and equipment in the refrigeration system of the supermarket refrigerated showcase are increased. Not many, so it is currently more and more widely used.
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