Energy And Exergy Analysis Of Transcritical Co(2)Two-Stage Compression Cycle

Based on theoretical analysis and experimental testing, the performances of transcritical CO(2)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 degrees C to 17 degrees 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%.