Abstract
The objective of this study is to decrease the refrigerant temperature at the compressor outlet under high thermal load conditions with low-GWP refrigerants in the showcase vapor compression cycle. When the outside temperature increases, the showcase cycle suffers a reliability problem due to the high discharge temperature. Liquid injection is a good method for decreasing the discharge temperature of the refrigeration cycle. This study presents the development of a simplified simulation model for predicting the performance of a liquid injection showcase cycle. The optimum injection pressures of the showcase cycle with R410A and R32 were presented. In addition, after the quasi-saturation compression cycle was reached through the multi-stage liquid injection control, the effect of reducing the discharge temperature was analyzed. Finally, the optimal number of injections for each of the refrigerant and operating conditions was presented.
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