冷壁面自然对流热质传递研究

为了得到蓄冰槽冷壁面在自然对流工况下的降温除湿特性以及环境温湿度、壁面形式和辐射对冷壁面传热传质的影响,建立了冷壁面自然对流传热传质二维模型,基于MATLAB采用控制容积法和连续性方程与动量方程联立的SIMPLE方法进行求解,并搭建试验台对此模型进行验证。结果表明:热质传递过程中,对流传热起主要作用,随着环境温湿度的增加,对流传热、传质和辐射传热都增大,但传质增加最快,在总换热量中所占比例也逐渐增大,壁面竖直和朝下的热值传递速度远快于壁面朝上,数值模拟结果与实验值拟合良好。研究结果可为蓄冰槽的自然降温除湿系统的应用提供参考。

Research of Natural Cooling Dehumidification Performance

In order to get the cold wall of ice storage tank under the natura000000000001 working condition convection cooling dehumidification characteristics and the environmental temperature and humidity, surface form and radiation influence on cold wall heat and mass transfer, established two-dimensional model of cold wall natural convection heat and mass transfer, based on MATLAB of control volume method and the continuity equation and momentum equation of simultaneous SIMPLE method to solve, and build test bench for verification of this model. The results show that： in the thermal and mass transfer process, the convection heat transfer plays a main role. With the increase of environmental temperature and humidity, convection heat transfer, mass transfer and radiation heat transfer is all increased, but mass transfer increases fastest, in the proportion of the total heat transfer also increase gradually, the thermal and mass transfer speed of downwards and vertical wall is faster than the wall of upwards, the results of numerical simulation and experimental data fitting is good. The results can provide reference for the ice storage tank of natural cooling dehumidification system.