Energy and exergy analysis of transcritical CO₂ two-stage compression cycle
by Hongli Wang; Jingrui Tian; Yitai Ma
International Journal of Exergy (IJEX), Vol. 32, No. 2, 2020

Abstract: Based on theoretical analysis and experimental testing, the performances of transcritical CO₂ two-stage compression cycle with two gas coolers were analysed. The maximum experimental refrigeration COP_c and heat COP_h are 2.24 and 3.25, the maximum theoretical COP_c and COP_h are 2.85 and 3.85. The COP both of COP_c and COP_h decrease gradually with increasing of the outlet temperature of gas cooler, and the average value of experimental COP_c and COP_h are 2.02 and 3.13, the average value of theoretical COP_c and COP_h are 2.54 and 3.54. Range of the evaporating temperature from −5°C to 17°C, the average value of experimental COP_c and COP_h are 1.99 and 3.17. The exergy loss both of theoretical value and experimental value are all increase gradually with increasing of differential pressure of throttling valve. The error of exergy loss percentage on theoretical calculation and experimental testing are almost all within +20% and −20%.

Online publication date: Fri, 03-Jul-2020

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