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The aim of this study is to investigate the effect of low global warming potential refrigerants on the optimum intermediate pressure (POPT’int) and performance (COP) values of a refrigeration system with flash intercooling. For realize, the optimum operating parameters of system were determined in low temperature applications (LTAs) through a theoretical analysis according to the different refrigerants (R290, R404A, R407C, R50A and R22). The theoretical modeling of system is done by optimizing the intermediate pressure at given evaporation (TE) and condensation (TC) temperatures for selected refrigerants. After optimization, the maximized values of COP and second law efficiency are computed from the predicted values of POPT’int. The linear regression method is then used to derive three correlations of POPT’int, maximum values of COP and second law efficiency according to TE and TC. Hence, the POPT’int values maximizing the system performance are found from various TE and TC values for each refrigerant. Due to calculations, increasing TE and TC cause the increase in POPT’int in LTAs. R507A system has the highest POPT’int values and R22 system has the lowest POPT’int values. Although R22 system has slightly more efficient than R290 system, it is being phased out worldwide because of the risk of ODP and GWP considerations. Therefore, it is important to evaluate the R22 replacement options. R290 was discovered to have better performance than the R404A, R407C and R507A systems in terms of COPmax (1.81), GWP (11) and ODP (0) when TE and TC are -35ºC and 40ºC.
PAPER REVISED: 2018-12-11
PAPER ACCEPTED: 2018-12-12
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THERMAL SCIENCE YEAR 2020, VOLUME 24, ISSUE Issue 2, PAGES [815 - 830]
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