CO_2跨临界循环与传统制冷循环的性能比较
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摘要
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.
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.
引文
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[2]H J Hgaard Knudsen,Jesen P H.Heat transfer coefficient for boiling carbon dioxide[J].Heat Pump and Air Conditioning Systems,1997(5):13-14.
[3]孙西峰,韩杨.汽车空调替代制冷剂的比较[J].制冷与空调,2015,15(5):60-67.
[4]苏梅,衣永海,秦海杰,等.CO2热泵热水系统试验研究[J].制冷与空调,2014,14(10):86-88.
[5]杨俊兰,李久东,唐嘉宝.两种CO2复叠式制冷系统的性能分析[J].流体机械,2017,45(1):83-85.
[7]宁静红,曾凡星.CO2为低温循环工质的复叠式制冷系统的分析比较[J].热科学与技术,2015(2):155-160.
[8]杨栋,陈汝东.低温冷库制冷领域使用CO2作为制冷剂的应用概述[J].制冷技术,2007(4):29-34.
[9]秦海杰,李鹏冲.CO2跨临界循环与常规制冷剂循环性能比较[J].制冷与空调,2014,14(2):50-53.
[10]姜云涛,马一太,刘和成,等.带回热器的高效跨临界CO2水-水热泵的实验研究[J].天津大学学报,2010,43(4):298-302.
[11]崔海亭,刘东岳,赵华丽,等.CO2热泵热水器与毛细管组合节流特性的研究[J].流体机械,2017,45(3):65-68.
[12]王侃宏.CO2跨临界循环的理论分析与实验研究[D].天津:天津大学,2000.
[1]Lorentzen G.Revival of carbon dioxide as a refrigerant[J].Int.J.Refrig,1994,17(5):292-301.
[2]H J Hgaard Knudsen,Jesen P H.Heat transfer coefficient for boiling carbon dioxide[J].Heat Pump and Air Conditioning Systems,1997(5):13-14.
[3]孙西峰,韩杨.汽车空调替代制冷剂的比较[J].制冷与空调,2015,15(5):60-67.
[4]苏梅,衣永海,秦海杰,等.CO2热泵热水系统试验研究[J].制冷与空调,2014,14(10):86-88.
[5]杨俊兰,李久东,唐嘉宝.两种CO2复叠式制冷系统的性能分析[J].流体机械,2017,45(1):83-85.