流体机械

2018, v.46;No.554(08) 66-70

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重力再循环制冷系统与直接膨胀制冷系统的对比研究
Comparative Study of Gravity Feeding Refrigeration System And Direct Expansion Refrigeration System

王赫;臧润清;
WANG He;ZANG Run-qing;Tianjin University of Commerce,Refrigeration Engineering Research Center of Ministry of Education,Tianjin Refrigeration Engineering Technology Center;

摘要(Abstract):

重力再循环制冷系统通过提高蒸发器内工质的流速来强化换热,通过热虹吸原理让工质实现再循环,使管内壁的润湿程度得到提高,有效降低了工质气体与管内壁的接触程度,从而提高工质侧的换热系数。通过在再循环系统试验装置上的改造,实现再循环制冷系统与直接膨胀系统的切换。试验对比了2种系统的传热温差、传热系数、制冷量、COP等参数。结果表明,相比于直接膨胀制冷系统,再循环制冷系统蒸发压力得到明显的提高,因此,再循环制冷系统的库内空气能达到更低的温度;在库内温度为-5-20℃的过程中,再循环制冷系统传热系数提高了57%-20℃的过程中,再循环制冷系统传热系数提高了57%115%,制冷量提高了11%115%,制冷量提高了11%26%,COP提高了8%26%,COP提高了8%20%。
By increasing the flow speed of the refrigerant in the evaporator of the gravity feeding refrigeration system as the means of enhanced heat transfer,the degree of wetting of inner wall of the tube was improved by making the refrigerant achieve recycling through the thermal siphon principle,which effectively decreased the degree of contact of the refrigerant gas with tube inner wall,and thereby improved the heat transfer coefficient of refrigerant side. Through modification on the test device for the gravity feeding refrigeration system,the switching between the gravity feeding refrigeration system and the direct expansion system was realized. The heat transfer temperature difference,heat transfer coefficient,cooling capacity,COP and other parameters of the two systems ere compared through tests. The results show that,compared to the direct expansion refrigeration system,the evaporator pressure of the gravity feeding refrigeration system was significantly improved,therefore,the cold storage with the gravity feeding refrigeration system can reach lower temperature. When the temperature of the cold storage was between -5℃ with 20℃,the heat transfer coefficient of the gravity feeding refrigeration system was increased by 57%20%。
By increasing the flow speed of the refrigerant in the evaporator of the gravity feeding refrigeration system as the means of enhanced heat transfer,the degree of wetting of inner wall of the tube was improved by making the refrigerant achieve recycling through the thermal siphon principle,which effectively decreased the degree of contact of the refrigerant gas with tube inner wall,and thereby improved the heat transfer coefficient of refrigerant side. Through modification on the test device for the gravity feeding refrigeration system,the switching between the gravity feeding refrigeration system and the direct expansion system was realized. The heat transfer temperature difference,heat transfer coefficient,cooling capacity,COP and other parameters of the two systems ere compared through tests. The results show that,compared to the direct expansion refrigeration system,the evaporator pressure of the gravity feeding refrigeration system was significantly improved,therefore,the cold storage with the gravity feeding refrigeration system can reach lower temperature. When the temperature of the cold storage was between -5℃ with 20℃,the heat transfer coefficient of the gravity feeding refrigeration system was increased by 57%115%,the refrigerating capacity was increased by 11%115%,the refrigerating capacity was increased by 11%26%,and the COP was increased by 20%.

关键词(KeyWords): 重力再循环制冷系统;直接膨胀制冷系统;传热温差;制冷量;COP
gravity feeding refrigeration system;direct expansion refrigeration system;heat transfer temperature difference;refrigerating capacity;COP

Abstract:

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基金项目(Foundation):

作者(Authors): 王赫;臧润清;
WANG He;ZANG Run-qing;Tianjin University of Commerce,Refrigeration Engineering Research Center of Ministry of Education,Tianjin Refrigeration Engineering Technology Center;

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