单管多翅片排管蒸发器传热性能实验研究

Experimental Research on Heat Transfer Performance of Single-tube Multi-row Finned Tube Evaporator

针对食品冷链系统用传统排管蒸发器传热效率低、管材消耗量大等问题,采用ASHRAE 75~77标准中规定的热平衡法,在0℃和-18℃库温分别对应的5个不同蒸发温度下,对冷库用单管双翅片排管蒸发器和单管八翅片排管蒸发器的翅片效率、传热系数和制冷量进行实验研究。结果表明:单管八翅片排管蒸发器的平均翅片效率为96.03%,比单管双翅片排管蒸发器高5.3%;单管八翅片排管蒸发器的单位管长制冷量是单管双翅片排管蒸发器的2.5~3倍,其单位质量铝材制冷量比单管双翅片排管蒸发器高11%~36%;与单管双翅片排管蒸发器相比,单管八翅片排管蒸发器在同等制冷量下耗材减少10%~30%。

In this study,the heat balance method stipulated in the ASHRAE 75-77 standard is adopted to solve the problems of low heat exchange efficiency and high consumption of pipes in traditional tube evaporators used in food cold chain systems.The fin efficiency,heat transfer coefficient,and cooling capacity of a single-tube double-row finned tube evaporator and single-tube eight-row finned tube evaporator used in cold storage were studied experimentally.The results show that the average fin efficiency of the single-tube eight-row finned tube evaporator is 96.03%,which is 5.3%higher than that of the single-tube double-row finned tube evaporator.The cooling capacity per tube length of a single-tube eight-row finned tube evaporator is 2.5-3 times that of a single-tube double-row finned tube evaporator,and its unit mass aluminum cooling capacity is 11%-36%higher.Compared with the single-tube double-row finned tube evaporator,the single-tube eight-row finned tube evaporator consumes 10%-30%less at the same cooling capacity.