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2205, Page 7 difference in refrigerant in experiment is the same as that in analysis except irreversible loss in evaporator of Binary 300 in experiment is higher than another refrigerant. The irreversible losses generated in evaporator are determined by the mean temperature difference between refrigerant and heat source water. Figure 10 (a) and (b) explains the temperature distribution in evaporator for heating mode 1 and heating mode 2 in experiment. The temperature distributions in evaporator for heating mode 1 are the same as that for heating mode 2 in all test refrigerants. For heating mode 1 and heating mode 2, temperature difference between Binary 300 and heat sink water is the largest among test refrigerant in evaporating end point despite the temperature glide of Binary 300 equal to water temperature change in the evaporator. Therefore, as results of irreversible loss in condenser and evaporator, even if temperature glide of zeotropic mixture equal to water temperature change in the heat exchanger, irreversible loss in heat exchanger increases because of lower heat transfer performance of heat exchanger. Figure 11 (a) and (b) shows irreversible loss through expansion value in experiment and analysis for heating mode 1 and heating mode 2. Symbols indicate the refrigerants in the same rule as in Figure 5. For heating mode 1 and heating mode 2, the trend of irreversible loss through expansion valve due to difference in refrigerant in experiment is the same as that in analysis 4.3 Irreversible Loss of Compressor and Pressure Drop Figure 12 shows irreversible loss in compressor in experiment for heating mode 1 and 2. On other hand, irreversible loss in compressor in analysis is not exist because efficiency of compressor is 1.0 in this analysis. For heating mode 1 and 2, the irreversible loss in compressor of R410 is the smallest among test refrigerants. At zeotropic mixture, the more the temperature glide is large, the more the irreversible loss in compressor is large. In other words, the more the thermophysical property of zeotropic mixture is different from that of R410A, the more the irreversible loss in compressor is large. This cause is that compressor and compressor oil in this study are compressor and compressor oil for R410A. Therefore, the irreversible loss in compressor of zeotropic mixture decreases if compressor is improved. (a) Experimental result (b) Analysis result Figure 11: Irreversible loss through expansion valve Figure 12: Irreversible loss in compressor Figure 13: Irreversible loss caused by pressure drop International Refrigeration and Air Conditioning Conference at Purdue, July 16-19, 2012PDF Image | Experimental Assessment on Performance of a Heat Pump Cycle
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