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首页> 外文期刊>The HKIE Transactions >Thermodynamic analysis of CO_2 transcritical two-stage compression refrigeration cycle systems with expanders
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Thermodynamic analysis of CO_2 transcritical two-stage compression refrigeration cycle systems with expanders

机译：具有扩展器的CO_2跨临界两级压缩制冷循环系统的热力学分析

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摘要

The key to improving the efficiency of carbon dioxide (CO_2) transcritical refrigeration systems is to select an appropriate two-stage compression system. In this study, the thermodynamic performance of six different CO_2 transcritical two-stage refrigeration systems with expanders is compared. The design parameters are analysed to determine their respective impacts on the system coefficient of performance (COP) in order to ascertain which system configuration produces the maximum system COP. It is concluded that the system with a two-stage expander and incomplete intercooling has great advantages in terms of performance and equipment selection for the high-pressure stage in certain circumstances. Under the given conditions, the design parameters including the evaporating temperature, the condensing temperature, the compressor efficiency of the high-pressure stage, and the compressor efficiency of the low-pressure stage impact on the system performance. It should be noted that the gas cooler outlet temperature and the compressor efficiency of the low-pressure stage are the major factors which affect the efficiency of the system; thus, the system design and equipment selection should minimise the gas cooler outlet temperature and select a high-efficiency compressor for the low-pressure stage to ensure efficient and safe operation.
机译：提高二氧化碳（CO_2）跨临界制冷系统效率的关键是选择适当的两级压缩系统。在这项研究中，比较了六种不同的CO_2跨临界两级制冷系统的热力学性能与扩展器进行了比较。分析设计参数以确定它们对系统性能系数（COP）的各自影响，以确定哪个系统配置产生最大系统警察。结论是，在某些情况下，具有两级膨胀机和不完全的中间电冷的系统在高压阶段的性能和设备选择方面具有很大的优势。在给定的条件下，设计参数包括蒸发温度，冷凝温度，高压级的压缩机效率，以及压缩机效率的低压阶段对系统性能的影响。应当注意，低压阶段的气体冷却器出口温度和压缩机效率是影响系统效率的主要因素;因此，系统设计和设备选择应最小化气体冷却器出口温度，为低压级选择高效压缩机，以确保有效和安全的操作。

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