流体机械

2019, v.47;No.559(01) 80-83+74

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CO_2跨临界循环与传统制冷循环的性能比较
Performance Comparison Between CO_2 Transcritical Cycle and Conventional Refrigeration Cycle

杨俊兰;沈士杰;高思雨;李久东;
Yang Junlan;Shen Shijie;Gao Siyu;Li Jiudong;School of Energy and Safety Engineering,Tianjin Chengjian University;

摘要(Abstract):

为了对比CO_2与常规工质在单级压缩制冷循环中的性能,运用当量温度法理论对两者进行了分析。分别比较了当量蒸发温度为0℃或当量冷凝温度为40℃时,CO_2与常规工质在单级压缩制冷循环中的COP和制冷量、制热量随当量冷凝温度和当量蒸发温度的变化情况;计算了不同吸气过热度下回热循环与基本循环的制冷系数的比值。结果显示,基本的单级CO_2跨临界循环的性能和制冷量、制热量低于常规制冷循环;在添加回热器后,CO_2跨临界循环系统的性能得到了很大的提高。
In order to compare the performance of CO_2 and conventional refrigerants in single-stage compression refrigeration cycle,the theory of equivalent temperature method was used to analyze the performance of the two media. When the equivalent evaporation temperature was 0 ℃ and equivalent condensing temperature was 40 ℃,respectively,the COP,cooling capacity and heating capacity varying with equivalent condensing temperature and equivalent evaporating temperature of CO_2 transcritical single-stage compression refrigeration cycle were compared with those of the conventional refrigeration cycles. The ratio of refrigeration coefficient for the Internal Heat Exchanger cycle to that of the basic cycle under different suction superheat conditions was calculated. The results show that the performance,refrigeration capacity and heating capacity of the basic single-stage CO_2 transcritical cycle were lower than those of the conventional refrigeration cycle. The performance of the CO_2 transcritical cycle system was greatly improved after the addition of the Internal Heat Exchanger.

关键词(KeyWords): CO_2跨临界循环;当量温度法;COP;回热循环
CO_2 transcritical cycle;equivalent temperature method;COP;Internal Heat Exchanger cycle

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基金项目(Foundation): 天津市自然科学基金项目(17JCZDJC31400);; 天津市科技特派员项目(16JCTPJC52800)

作者(Author): 杨俊兰;沈士杰;高思雨;李久东;
Yang Junlan;Shen Shijie;Gao Siyu;Li Jiudong;School of Energy and Safety Engineering,Tianjin Chengjian University;

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