Modified CO2-based combined cooling and power cycle with multi-mode and adjustable ability

To fulfill the diversified demand of power and cooling, the multi-mode combined cooling and power cycle based on CO2 is studied in this research, which can realize full power mode, simultaneous power and refrigeration mode and full refrigeration mode. A two-phase ejector is introduced to ameliorate the configurations of conventional combined cycles. A refrigerated truck is selected as the research objective and two refrigeration conditions are considered. Through the energy and exergy analyses, great improvement in performance and considerable potential in diversified energy supply can achieve by the modified systems. Therein, the modified system with single-stage compression achieves 4.9% improvement of power output and 21.7% improvement of refrigeration output versus the baseline system under refrigeration condition. It can provide extra 15.1 kW power for the objective refrigerated truck after satisfying the refrigeration demand. Besides, the adjustability performance is also discussed in this study, which reveals that the modified system with single-stage compression also possesses the best adjustability performance for its highest cooling to power ratio and the convenient mode transforming and controlling.