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首页> 外文期刊>Clean technologies and environmental policy >Performance evaluation and optimal configuration analysis of a transcritical carbon dioxide/propylene cascade system with vortex tube expander in high-temperature cycle
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Performance evaluation and optimal configuration analysis of a transcritical carbon dioxide/propylene cascade system with vortex tube expander in high-temperature cycle

机译：带有涡流扩管器的跨临界二氧化碳/丙烯级联系统在高温循环中的性能评估和最佳构型分析

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摘要

This paper presents a theoretical investigation on the thermal performance of a natural refrigerant-based cascade refrigeration-heat pump system used to produce both heating and cooling. A parametric evaluation is also presented for carbon dioxide-propylene working pair by varying parameters like evaporating, gas cooler exit temperature, and temperature difference in the cascade heat exchanger of the system. The topping cycle of the system is provided with a vortex tube instead of an expansion valve. The maximum increase in coefficient of performance of the present system is 5.9 % compared to that of the transcritical cascade cycle without vortex tube expander, in the assumed range of operating parameters. The model predicts performance parameters and operating conditions e.g., pressure, enthalpy, temperature, and entropy at different state points. The proposed transcritical model is optimized for overall coefficient of performance, intermediate temperature, and mass flow ratio with the help of multi-linear regression analysis. The influences of main parameters on the optimum design quantities are displayed in tables and figures. The cascade refrigeration-heat pump model with carbon dioxide/propylene as refrigerants is validated by comparing the coefficient of performance values with other reference cascade systems. This study could contribute to the further development and the optimal design of carbon dioxide-propylene cascade refrigeration systems.
机译：本文对用于产生加热和冷却的基于天然制冷剂的级联制冷-热泵系统的热性能进行了理论研究。还通过更改参数（例如蒸发，气体冷却器出口温度和系统级联热交换器中的温差）对二氧化碳-丙烯工作对进行了参数评估。系统的加油循环配有涡流管，而不是膨胀阀。在假定的操作参数范围内，与没有涡旋扩管器的跨临界级联循环相比，本系统的性能系数的最大增加为5.9％。该模型预测性能参数和操作条件，例如在不同状态点的压力，焓，温度和熵。所提出的跨临界模型借助多线性回归分析针对整体性能系数，中间温度和质量流量比进行了优化。表格和图表中显示了主要参数对最佳设计量的影响。通过将性能系数值与其他参考级联系统进行比较，验证了以二氧化碳/丙烯为制冷剂的级联制冷热泵模型。该研究可为二氧化碳-丙烯级联制冷系统的进一步开发和优化设计做出贡献。

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