摘要
以大型空气源热泵内尺寸较大的翅片管换热器作为研究的蒸发器,在制冷剂分别采用R410A与R22时,分析了换热器迎风面风速分布的二维不均匀性对换热器性能的影响。建立了翅片管换热器的传热数学模型,并与实验结果进行对比而验证模型的准确合理性。在制冷剂按照三种不同流路进行布置时,比较了各种布置方式受风速不均匀性的影响程度,探讨了风速均匀性对蒸发器换热量的影响,并研究了对流换热系数的变化规律,揭示了风速分布与对流换热系数之间的关系。研究结果将为大型空气源热泵冬季运行时蒸发器的性能变化提供理论指导。
In this paper, the finned tube heat exchanger with large size of large-scale air source heat pump is taken as the investigative evaporator. When both R410 A and R22 are employed as the refrigerants, the influences of two-dimensional nonuniformity of wind speed distribution on the performance of the heat exchanger are analyzed The heat transfer mathematical models of heat exchanger are established, and the comparison between theoretical calcultion results and experiment data are made to verify the accuracy and rationality of the models. When refrigerants are arranged in three different flow paths, the influences of wind speed nonuniformity of different arrangment forms are compared;the influences of wind speed nonuniformity on the heat exchange amount of evaporator are explored, and the changing rules of convective heat transfer coefficient are studied, and therefore the relationship between wind speed distribution and convective heat transfer coefficient is revealed. The research results will provide theoretical guidance for the change of performance of evaporator while the large-scale air source heat pumps are operated in winter.
作者
张鑫
姚海清
侯幸
张文科
崔玉萍
Zhang Xin;Yao Haiqing;Hou Xing;Zhang Wenke;Cui Yuping(School of Thermal Engineering,Shandong Jianzhu University,Jinan,250101;Shandong Zhongnui New Energy Technology Co.,Ltd.,Jinan,250101)
出处
《制冷与空调（四川）》
2022年第1期10-16,共7页
Refrigeration and Air Conditioning
基金
山东省重点研发计划项目(2019GGX103046)
山东省博士后创新项目“北方农村地区太阳能-空气能复合供能系统关键技术的研究”
国家自然科学基金(51808321)。
关键词
空气源热泵
蒸发器
翅片管换热器
二维风速分布
流路布置
不均匀性
Air source heat pump
Evaporator
Finned tube heat exchanger
Two dimensional wind speed distribution
Arrangement of flow path
Nonuniformity
