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150 125 100 75 50 25 0 -25 -1.75 -1.50 -1.25 -1.00 s [kJ/kg-K] -0.75 -0.50 Carbon Dioxide 0.2 80 bar b a f' a' e' 60 bar 40 bar c 0.4 0.6 0.8 140 bar e 120 bar f d' c' b' d Figure 3‐13 Double loop system T‐S chart (EES) Based on the assumptions of system working conditions listed in Table 3‐1, the CO2 double loop system performance is calculated and the results (Table 3‐2) show that if a low‐grade heat source such as solar thermal or waste heat is used, the proposed double loop system can improve the COP of the parallel running CO2 refrigeration system by 34 %. Table 3‐1 Carbon dioxide double loop system basic operating conditions Simulation Parameters Evaporator pressure Evaporation temperature Refrigerant mass flow Superheat after evaporator Gas cooler pressure Gas cooler outlet temperature Value Unit 40 bar 5.3 °C 0.08 Kg/s 5 (fixed value) K 83 bar 3513 °C 13 This temperature is the temperature before the IHX. The real gas cooler outlet temperature is the temperature after providing 5°C superheat at evaporator outlet (I.e. 33°C in the current case). 35 T [°C] 0.0057 0.01 0.019 0.034 m3/kg 0.0017PDF Image | Thermodynamic Cycles using Carbon Dioxide
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