波纹板式空冷器阻力与传热特性实验研究

在可改变风量和热水流量的实验条件下,对波纹板式空冷器的阻力与传热特性进行实验研究。得到了空气侧的阻力降关联式以及两侧的对流换热系数关联式,其适用于热水雷诺数在2000-8000之间、空气雷诺数在2000-10000之间。在相同工况下,比较了波纹板式、光管式和翅片管式空冷器的性能指标,结果表明:迎面风速在2.45-4.1 m/s之间,波纹板式空冷器传热系数达到100-160 W/m2/℃;约比光管式提高70%,但只有以管束外表面为基准的翅片管式传热系数的六分之一;板式空冷器单位体积换热量约是翅片管式空冷器的1.5倍,是光管式的15倍;板式空冷器单位功耗换热量约是光管式空冷器的5.5倍,而翅片管式空冷器与光管式空冷器则相差不大。

An experimental study on the thermal and hydraulic characteristics of the corrugated plate air-cooled heat exchanger

Experiments of heat transfer and pressure drop in a corrugated plate air-cooled heat exchanger were conducted with variable supply air and hot water flow rates.Both air-side pressure drop correlations and air-side and water-side heat transfer coefficients were obtained,where the Reynolds number for water side ranged from 2000 to 8000 and the Reynolds number for air side ranged from 2000 to 10000.Furthermore the performances of heat transfers including corrugate plate,tube and fin-tube were compared under the same conditions.The results show that when the air frontal velocity is between 2.45 and 4.1 m/s,the overall heat-transfer coefficient of plate heat exchanger ranges from 100 to 160 W/m~2/℃ equal to one sixth of that of fin-tube cooler based on tube outside area,which is about 70% higher than that of tube cooler.The volumetric heat transfer capacity of plate cooler is 1.5 times as that of fin-tube cooler and 15 times as that of tube cooler.The heat transfer capacity of per unit power of plate cooler is 5.5 times as that of tube cooler and similar results for fin-tube cooler.