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R046, Page 2 the main factor that influences the working fluid temperature profile in the heat exchanger, is plotted as a function of temperature for different pressures in Figure 1. 35 30 25 20 15 10 5 CP of Supercritical Carbon Dioxide P=8.0 Mpa P=9.0 Mpa P=10.0 Mpa P=11.0 Mpa P=12.0 Mpa 0 10 20 30 40 50 60 70 Temperature (oC) Figure 1. Supercritical carbon dioxide’s specific heat vs. temperature at different pressures (calculation results from Refprop 7.0) It can be noticed in Figure 1 that the specific heat of the supercritical carbon dioxide is changing with the temperature with a higher peak when the pressure get close to the critical pressure. Further, it may also be noticed that the temperature corresponding to the peak in specific heat is increasing with the increasing of pressure. For the transcritical refrigeration cycle, this sharp variation can take place either in the Internal Heat Exchanger (IHX3),when transferring the heat to the low pressure side carbon dioxide or in the Gas Cooler (GC) ,while rejecting heat to the heat sink. However, compared to the specific heat variation of supercritical carbon dioxide, the specific heat of heat sink (e.g. cooling air for gas cooler) and low pressure side carbon dioxide are not varying much. The specific heat variation of the heat sink (air) for the GC and the low pressure side carbon dioxide in the IHX are plotted as a function of temperature in figure 2. Note the differences in scale compared to figure 1. 1.009 1.008 1.007 1.006 1.005 Cp of gas cooler's cooling air Air at 0.1 Mpa 10 20 30 40 50 60 Temperature (°C) Cp of evaporater outlet carbon dioxide 2.4 2.2 2 1.8 1.6 1.4 1.2 1 P=3 Mpa P=3.5Mpa P=4 Mpa -10 -5 0 5 10 15 20 Temperature (°C) Figure 2. Specific heat of gas cooler’s cooling air at atmospheric pressure and of evaporator’s outlet carbon dioxide at different pressures (calculation results from EES and Refprop 7.0) 3 Sometimes referred to as suction gas heat exchanger International Refrigeration and Air Conditioning Conference at Purdue, July 17-20, 2006 Cp (kJ/kg•k) Cp (kJ/kg•k) CP(KJ/kg•K)PDF Image | Analysis of Supercritical CO2 Heat Exchangers in Cooling
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