大型速冻设备不同结构蒸发器的传热性能比较

Comparative research on the heat transfer efficiency of evaporators with different structures used in a large quick-freeze plant

通过对大型速冻设备不同结构型式蒸发器的理论分析和试验研究,分别对不同翅片形状、管径大小以及管子排列方式对蒸发器传热系数的影响进行了分析比较,获得了在工程应用中传热系数最高的蒸发器结构是连续整体带波纹翅片叉排变节距结构的结论。并对这种结构的蒸发器进行试验测试,得到与理论计算相符的传热系数值。

Evaporators with different structural types have diiierent heat transier coefficients. In this paper, the authors chose six evaporator models with different structures, to analyze and compare the influences of fin shape, tube diameter and tube arrangement on heat transfer coefficient of an evaporator. The conclusion is that, under freezing circumstances, the structure with the highest heat transfer coefficient is the one with continuous unitary plate fins with wave, cross pipe arrangement and varying fin spacing. Then the authors made an experimental investigation on this type of evaporator, and obtained a heat transfer coefficient in line with theoretical calculation.