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首页> 外文期刊>The Journal of Supercritical Fluids >Thermodynamic analysis of double-compression flash intercooling transcritical CO2 refrigeration cycle
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Thermodynamic analysis of double-compression flash intercooling transcritical CO2 refrigeration cycle

机译：双压缩闪速中冷跨临界CO2制冷循环的热力学分析

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The performance of double-compression flash intercooling (DCFI) transcritical CO2 refrigeration cycle is evaluated by thermodynamic analysis in comparison with the double-compression external intercooling (DCEI) cycles. The effect of expander isentropic efficiency and position on the performance of DCFI cycle is investigated. Six double-compression refrigeration cycles are studied in the paper. The results show that the DCFI cycle performs better than DCEI cycle when the throttle valve is used as the expansion device. The replacement of the throttle valve with the expander yields less coefficient of performance (COP) improvement for DCFI cycle compared with DCEI cycle, especially at low evaporating temperatures or high gas cooler outlet temperatures. The COP of the two cycles is nearly equivalent when the isentropic efficiency of the expansion processes reaches 1.0. The DCFI cycle with only one throttle valve replaced with an expander shows lower COP compared with the corresponding DCEI expander cycle. The replacement of the main throttle valve with an expander results in higher COP compared with the auxiliary throttle valve replacement in the DCFI cycle. The substitution throttle valve for expander in the DCFI cycle is not economical compared with DCEI cycle. Furthermore, the optimum gas cooler pressure, the optimum intermediate pressure and the mass flow rate ratio are also discussed in the paper. (C) 2015 Elsevier B.V. All rights reserved.
机译：与双压缩外部中间冷却（DCEI）循环相比，通过热力学分析评估了双压缩快速中间冷却（DCFI）跨临界CO2制冷循环的性能。研究了膨胀机的等熵效率和位置对DCFI循环性能的影响。本文研究了六个双压缩制冷循环。结果表明，将节流阀用作膨胀装置时，DCFI循环的性能优于DCEI循环。与DCEI循环相比，用膨胀器代替节流阀产生的DCFI循环性能系数（COP）改善较小，尤其是在低蒸发温度或高气体冷却器出口温度的情况下。当膨胀过程的等熵效率达到1.0时，两个循环的COP几乎相等。与相应的DCEI膨胀机循环相比，仅一个节流阀替换为膨胀机的DCFI循环显示较低的COP。与在DCFI循环中更换辅助节流阀相比，用膨胀器更换主节流阀可提高COP。与DCEI循环相比，DCFI循环中用于膨胀机的替代节流阀不经济。此外，本文还讨论了最佳气体冷却器压力，最佳中间压力和质量流量比。 （C）2015 Elsevier B.V.保留所有权利。

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