改进型分液器对冷风机性能影响的实验研究

Experimental study of the influence of a type liquid distributor on the performance of air cooler

按照节流-再混合-流型整定-再分配的原则,对制冷系统中现有的分液器进行了分类;根据两相流的流型理论对孔板型分液器进行改进,分别在校准箱温度为0℃、-4℃、-8℃、-12℃、-16℃、-20℃六种工况下,在冷风机性能试验台同时用空气侧热平衡法和制冷剂侧焓差法测试其对冷风机性能的影响。结果表明:在安装两种分液器时,冷风机冷量都随着校准箱温度的降低而降低;在相同的校准箱温度下,冷风机在安装改进分液器时,其冷量和传热系数都大于安装旧分液器时的冷量,但前者冷量降低的速度大于后者,校准箱温度从0℃到-20℃,其冷量分别从7.17k W和6.02k W降到5.39k W和5.10k W。

According to the principle of throttle -remix- flow type setting- redistribution, the existing liquid distributors used in the refrigeration system were classified. Based on the flow pattern theory of two phase flow, the orifice type liquid distribu- tor was optimized. The performance of air cooler with optimized distributor and non - optimized distributor was tested out at the calibrating tank tempetature of 0℃, -4℃, -8℃, - 12℃, - 16℃, -20℃ respectively using heat balance method and enthalpy - difference method simultaneously. The results show that the cooling capacity of air cooler in the installation of two distributors respectively decreases with the calibrating tank temperature decreasing. At the condition of the same calibrating tank temperature, the cooling capacity and heat transfer coefficient of air cooler with the optimized distributor is higher than that of air cooler with the non - optimized distributor. But the decelerate of cooling capacity of the former is also higher than that of the latter. The cali- brating tank temperature from 0℃ to -20℃ ,their cooling capacity respectively decreases from 7.17kW and 6.02kW to 5.39kW and 5.10kW.