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Thermodynamic, economic, and environmental analyses of various novel ejector refrigeration subcooled transcritical CO2 systems
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2021-05-13 , DOI: 10.1002/er.6841
Vinay Kumar Yadav 1 , Jahar Sarkar 1
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2021-05-13 , DOI: 10.1002/er.6841
Vinay Kumar Yadav 1 , Jahar Sarkar 1
Affiliation
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The ejector refrigeration cycle has gained special interest due to its simplicity and hence can be a good choice as a subcooling device for the transcritical CO2 refrigeration system for performance improvement, which is an emerging research field. Hence, the aim of this study is the proposal and comparison of various ejector refrigeration-based dedicated subcooling methods in the CO2 refrigeration system. Six different cycle configurations (one is existing and five are novel) using the ejector refrigeration cycle for subcooling the CO2 after the gas cooler are examined. All cycles are analyzed energetically, exegetically, economically, and environmentally by developed model and compared with the reference CO2 refrigeration system (without subcooling). Effects of gas cooler pressure, generator temperature, evaporator temperature, ambient temperature, and degree of subcooling are discussed. Gas cooler pressure is optimized for maximum COP. Cycle 4 (with internal heat exchanger and gas cooler waste heat-driven generator only) yields maximum COP and exergy efficiency among all subcooling cycles at optimum operating conditions. However, the environmental pollution for cycles without an internal heat exchanger is less. In terms of cost per cooling capacity, Cycle 4 is best but having operational restriction (better for sufficiently higher temperature lift). Cycle 1 and Cycle 2 may be the better choice if heat is available.
中文翻译:
各种新型喷射器制冷过冷跨临界 CO2 系统的热力学、经济和环境分析
喷射器制冷循环因其简单性而受到特别关注,因此可以作为跨临界 CO 2制冷系统的过冷装置以提高性能,这是一个新兴的研究领域。因此,本研究的目的是在 CO 2制冷系统中提出和比较各种基于喷射器制冷的专用过冷方法。六种不同的循环配置(一种是现有的,五种是新颖的)在检查气体冷却器之后使用喷射器制冷循环来过冷CO 2。通过开发的模型对所有循环进行能量、释经、经济和环境分析,并与参考 CO 2 进行比较制冷系统(无过冷)。讨论了气体冷却器压力、发电机温度、蒸发器温度、环境温度和过冷度的影响。优化气体冷却器压力以获得最大 COP。循环 4(仅带有内部热交换器和气体冷却器废热驱动发电机)在最佳操作条件下的所有过冷循环中产生最大的 COP 和火用效率。但是,没有内部热交换器的循环对环境的污染较小。就单位冷却能力的成本而言,循环 4 是最好的,但有操作限制(对于足够高的温升更好)。如果有热量,循环 1 和循环 2 可能是更好的选择。
更新日期:2021-05-13
中文翻译:
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各种新型喷射器制冷过冷跨临界 CO2 系统的热力学、经济和环境分析
喷射器制冷循环因其简单性而受到特别关注,因此可以作为跨临界 CO 2制冷系统的过冷装置以提高性能,这是一个新兴的研究领域。因此,本研究的目的是在 CO 2制冷系统中提出和比较各种基于喷射器制冷的专用过冷方法。六种不同的循环配置(一种是现有的,五种是新颖的)在检查气体冷却器之后使用喷射器制冷循环来过冷CO 2。通过开发的模型对所有循环进行能量、释经、经济和环境分析,并与参考 CO 2 进行比较制冷系统(无过冷)。讨论了气体冷却器压力、发电机温度、蒸发器温度、环境温度和过冷度的影响。优化气体冷却器压力以获得最大 COP。循环 4(仅带有内部热交换器和气体冷却器废热驱动发电机)在最佳操作条件下的所有过冷循环中产生最大的 COP 和火用效率。但是,没有内部热交换器的循环对环境的污染较小。就单位冷却能力的成本而言,循环 4 是最好的,但有操作限制(对于足够高的温升更好)。如果有热量,循环 1 和循环 2 可能是更好的选择。