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Figure D.3 Comparison of effect of high and low pressure receiver on ideal R410A subcritical cycle D.2.2 Transcritical cycle In the transcritical cycle, there can be no separation of liquid and vapor at the exit of the gas cooler, as the supercritical fluid is single phase. As a result, the receiver would not serve to regulate the gas cooler pressure. Additionally, since the exit from the gas cooler is supercritical liquid, the receiver’s purpose as a refrigerant reservoir would be limited, as a large increase in pressure would be necessary for a small volume of refrigerant storage. This limitation could be overcome with a patented variable volume high side receiver (Lorentzen and Petterson, 1993). D.3 Flash gas bypass in subcritical / transcritical cycle Flash gas bypass plays the same role in the subcritical and transcritical cycles. Flash gas bypass can be used to separate liquid from vapor of the refrigerant entering the evaporator. The benefit for R744 systems is substantial because it minimizes distribution problems in the headers of microchannel heat exchangers, which are used to accommodate the high pressures of carbon dioxide. Flash gas bypass not only results in better distribution through the header, but at the same time allows for control of the evaporator exit quality. By placing the receiver after the expansion valve, separation of liquid and vapor can occur which would not happen if the receiver were placed before the expansion valve (as in a high-pressure receiver). This low-pressure receiver also allows for the accumulation of excess refrigerant in the cycle. From Condenser Exp Valve Figure D.4 Flash Gas Bypass To Comp. Rec. Evaporator 71PDF Image | Comparison of R744 and R410A
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