This proposes a novel dual-ejector based organic flash combined power and refrigeration cycle, which replaces the two throttle valves with two ejectors for the basic flash cycle, to provide power and cooling simultaneously for users. Detailed mathematical models of the proposed system are built and validated. The preliminary analysis results show that the exergy efficiency reaches 45.59% under geothermal water at 150℃. Then a parametric analysis is conducted to investigate the effects of five key parameters on system performance. The results show that both an optimal flash pressure and an extraction pressure exist to maximize the exergy efficiency. Finally, the proposed cycle, the separated power and refrigeration cycle consisting of a basic organic flash cycle and an ejector refrigeration cycle, and the basic organic flash cycle are optimized and compared by examining seven different organic fluids such as R245fa, R141b, R123, R245ca, R601, R365mfc, and R600. The results show that the R245fa brings the highest exergy efficiency to both the proposed cycle and organic flash cycle among seven involved organic fluids. Compared with the basic organic flash cycle, the proposed cycle with R245fa has a 4.91% percentage point higher exergy efficiency, 10.44% higher net power output, and an extra 172.6 kW of refrigeration output. Meanwhile, the optimal exergy efficiency and net power output of the proposed cycle are 5.82–6.80% percentage point higher and 15.06–23.87% higher than those of the separated power and refrigeration cycle. An exergy analysis suggests that the throttling losses are indeed significantly reduced by replacing the throttle valves with the ejectors for the organic flash cycle.

这提出了一种新颖的基于双喷射器的有机闪蒸动力和制冷循环组合，该装置将两个节气门用两个喷射器代替了基本的闪蒸循环，同时为用户提供动力和冷却。建立并验证了所提出系统的详细数学模型。初步分析结果表明，在150℃的地热水下，火用效率达到45.59％。然后进行参数分析，以研究五个关键参数对系统性能的影响。结果表明，最佳的闪蒸压力和抽气压力都存在，以最大限度地提高了火用效率。最后，建议的循环是由基本有机闪蒸循环和喷射器制冷循环组成的动力和制冷分离循环，通过检查七种不同的有机液体（例如R245fa，R141b，R123，R245ca，R601，R365mfc和R600），优化和比较了基本有机闪蒸循环。结果表明，R245fa在拟议的循环和有机闪蒸循环中，在所涉及的七种有机流体中均带来了最高的火用效率。与基本的有机闪蒸循环相比，拟议的R245fa循环的火用效率提高了4.91％个百分点，净功率输出提高了10.44％，制冷量增加了172.6 kW。同时，与单独的动力和制冷循环相比，拟议循环的最佳火用效率和净功率输出分别高5.82–6.80％和15.06–23.87％。