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3.2 Optimization Correlation Based on the analysis, the GC outlet temperature is the most influential parameter on the optimum GC pressure. A second-order polynomial is developed based on the simulated points shown in Figure 7, which is calculated at a 15 Β°C evaporation temperature and 1K total superheat. Using regression analysis, the polynomial fit has coefficient of determination (R2) of 1. 2 (11) π =8.197+1.717βπ + 0.01448βπ πΊπΆπ This correlation is developed for the range of operating conditions of 32 Β°C < π πΊπΆπ πΊπΆπππ‘ πΊπΆπ <140 bar. Figure 7 shows the developed correlation in comparison with the common ones in the literature displayed with their respective valid range. Figure 7: Developed correlation for optimized GC pressure shown in thick green curve compared to correlations available in the literature 4. CONCLUSION In this paper, the CO2 transcritical cycle is modeled and analyzed. For the sourced compressor, the isentropic and volumetric efficiency correlations are developed from simulated data points at three different evaporation temperatures. The efficiency correlations are compared to correlations from the literature. The isentropic efficiency varies considerably between different compressors, hence selecting the appropriate correlations for simulating the cycle behavior is important. The effect of the GC outlet pressure and temperature, the evaporation temperature, and the useful superheat taking place inside the evaporator on the COP are investigated and discussed. The GC outlet temperature is the most influential parameter on the optimum GC pressure. The evaporation temperature has a negligible effect on the optimum GC pressure. An optimized control correlation is developed, and compared to common ones in the literature. The correlation relates the optimized GC pressure to the GC outlet temperature which can be used to maximize the transcritical cycle COP for relevant range of operating conditions. COP GC GWP h NOMENCLATURE coefficient of performance (-) gas cooler (-) global warming potential (-) specific enthalpy (J/kg) 17th International Refrigeration and Air Conditioning Conference at Purdue, July 9-12, 2018 < 53 Β°C and 75 bar <π πΊπΆπππ‘ 2643, Page 7PDF Image | Transcritical CO2 Heat Pump Cycle
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