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设计一款新型细薄膜蒸发器,并与压缩式制冷系统相结合,对新型细薄膜蒸发器的传热特性进行研究.结果表明:随着蒸发器蒸发温度的升高,两种蒸发器的蒸发功率均呈线性增加,相同工况下,细薄膜蒸发器的蒸发功率约为普通光管蒸发器蒸发功率的2倍;细薄膜蒸发器的进出口壁面温差明显低于普通光管蒸发器,光管蒸发器的平均传热温差比细薄膜蒸发器高出约2℃.对应每个工况下,细薄膜蒸发器的换热系数明显高于普通光管蒸发器,0~5℃时,细薄膜蒸发器可保持较高的换热系数,换热系数在5℃时达到最大.实验数据说明,细薄膜蒸发器的传热性能明显优于普通光管蒸发器.
A new thin film evaporator was designed and combined with the compression refrigeration system to study the heat transfer characteristics of the new thin film evaporator.The results showed that with the increase of evaporator temperature, the evaporation of the two evaporators The power of the thin-film evaporator increases linearly. Under the same operating conditions, the evaporation power of the thin-film evaporator is about twice as that of the ordinary light-tube evaporator. The temperature difference between the inlet and outlet of the thin-film evaporator is obviously lower than that of the ordinary light-tube evaporator. The average heat transfer temperature difference of the tube evaporator is about 2 ℃ higher than that of the thin film evaporator. Corresponding to each operating condition, the heat transfer coefficient of the thin film evaporator is obviously higher than that of the ordinary tube evaporator. The thin film evaporator can maintain a high heat transfer coefficient, the maximum heat transfer coefficient at 5 ℃ .Experimental data show that the thin film evaporator heat transfer performance is significantly better than ordinary light tube evaporator.