流体机械

2020, v.48;No.579(09) 83-88

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四种不同流程布置的风冷式冷凝器的试验研究
Experimental Study on Air-cooled Condensers with Four Different Process Layouts

臧润清;周会芳;张晨旭;
Zang Runqing;Zhou Huifang;Zhang Chenxu;Tianjin Key Laboratory of Refrigeration Technology,Tianjin University of Commerce,Refrigeration Engineering Research Center of Ministry of Education of People's Republic of China,Tianjin Refrigeration Engineering Technology Center;

摘要(Abstract):

为了研究大型风冷式冷凝器不同流程布置送风条件对换热性能的影响,分别对不同迎面风速、不同迎风温度时的冷凝器换热量、制冷剂压降、相区长度进行了分析,结果表明:较低的迎面风速下增加合流点次数使两相区换热管长度增加,具有较高的制冷剂侧对流换热系数;在较低的迎风温度下,换热量随制冷剂合流次数的增加而增大;在较高的迎风温度下,换热量随制冷剂合流次数的增加而减小;T_(ai)=25 ℃,管内制冷剂在相对长度等于0.74的位置已经进入过冷区,T_(ai)=33 ℃时流程布置d的所有制冷剂合流点都处于两相区,导致合流之后制冷剂同时存在较大的压力梯度和较大的质量流速,使得制冷剂两相区饱和温度急剧下降至低于空气侧平均温度的温度区域。
In order to study the influence of the air supply conditions on the heat transfer performance of air-cooled condensers in different process layouts,the heat exchange capacity,refrigerant pressure drop and phase length of the condenser were analyzed for different frontal wind speeds and different windward temperatures.The experimental results show that increasing the number of confluence points at a lower frontal wind speed increases the length of the heat exchange tube in two-phase region,and there is a higher refrigerant-side convection heat transfer coefficient.At a lower windward temperature,the heat exchange capacity increases with the number of refrigerant confluences.At a higher upwind temperatures,the heat exchange capacity decreases as the number of refrigerant confluences increases.When T_(ai)=25 ℃,the refrigerant in the tube has entered the subcooled region at a relative length equal to 0.74,when T_(ai)=33 ℃,all the refrigerant confluence points of the flow layout d are in the two-phase region,so that there are a large pressure gradient and a large mass flow rate of the refrigerant at the same time after the confluence,which makes the saturation temperature of the two-phase region of the refrigerant drop sharply to a temperature region below the average temperature on the air side.

关键词(KeyWords): 风冷式冷凝器;流程布置;迎面风速;迎风温度
air cooled condenser;process layout;oncoming wind speed;windward temperature

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作者(Author): 臧润清;周会芳;张晨旭;
Zang Runqing;Zhou Huifang;Zhang Chenxu;Tianjin Key Laboratory of Refrigeration Technology,Tianjin University of Commerce,Refrigeration Engineering Research Center of Ministry of Education of People's Republic of China,Tianjin Refrigeration Engineering Technology Center;

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