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5. DISCUSSION The optimum GC pressure for carbon dioxide transcritical refrigeration cycle obtained by equation 1 is related to both evaporation temperature and the GC’s outlet temperature. The calculated optimum GC pressure is plotted against different GC’s outlet temperatures for different evaporation temperatures as well as against different evaporation temperatures for different GC outlet temperatures in figure 7 respectively. 12 12 R046, Page 6 5 °C evaporation temperature 0 °C evaporation temperature -5 °C evaporation temperature 45 °C CO2 gas cooler outlet temperature 40 °C CO2 gas cooler outlet temperature 35 °C CO2 gas cooler outlet temperature 11 10 9 8 11 10 9 8 7 76 32 36 40 44 -10 -6 -2 2 6 10 Tgascooler outlet (°C) (a) Tevaporation (°C) (b) Figure 7. Carbon dioxide transcritical refrigeration cycle (a) optimum GC pressure against different GC outlet temperature at different evaporation temperatures (b) optimum GC pressure against different evaporation temperatures at different GC outlet temperatures It can be noticed in figure 7 that for a certain evaporation temperature, the higher the GC’s outlet temperature is, the higher the optimum GC pressure will be. While for a certain GC’s outlet temperature, the higher the evaporation temperature is, the lower the optimum GC pressure will be. Further, the GC’s outlet temperature has much more influence on the cycle’s optimum GC pressure than the evaporation temperature has. Maintaining the evaporation temperature as 5 °C, the temperature profile of supercritical carbon dioxide in the GC and the IHX is plotted in a ∆T-∆H chart (figure 8) for different GC’s outlet temperatures. For every GC outlet temperature, the pressure is kept at optimum GC pressure that calculated by equation 1. Supercritical CO2 ∆T — ∆h chart for integrated gas cooelr and IHX (@ Q_cooling=10 kw,T_evap.=5 °C, m_GC's cooling air=0.5 kg/s) 1 0.8 0.6 0.4 0.2 0 At 35°C GC outlet temp. P_opt.=8.7 Mpa At 40°C GC outlet temp. P_opt.=10.05 Mpa At 45°C GC outlet temp. P_opt.=11.4 Mpa 0 0.2 0.4 0.6 0.8 1 ∆H (KJ/kg•K) Figure 8. Supercritical carbon dioxide’s ∆T--∆H chart for the integrate heat exchanger length (includes GC and IHX) at different gas cooler outlet temperatures International Refrigeration and Air Conditioning Conference at Purdue, July 17-20, 2006 ∆T(°C) Popt (Mpa) Popt (Mpa)PDF Image | Analysis of Supercritical CO2 Heat Exchangers in Cooling
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