蒸发式冷气机性能参数的试验研究

在改造后的风管式焓差法试验台上对样机进行了热工性能试验。试验分两个阶段:将喷淋水温度设定为进口空气湿球温度,试验研究不同空气流速和水汽比对阻力和效率的影响,得出最佳空气流速和水汽比;在此基础上测试喷淋水温度对水蒸发冷却器效率的影响。试验数据的整理与分析结果表明,最佳迎面空气流速为1.0m/s,最佳水汽比为0.1,蒸发冷却效率和显热制冷量随着喷淋水温度的升高而降低。根据冷气机制冷量实测值不低于明示值95%的规定,经计算得出,喷淋水温度的波动范围为20.13～25.86℃。

Experiments on performances of evaporative cooling machine

On the reformed test bed based on the ducted enthalpy test method,performs the thermal performance experiment for the prototype.The experiment is carried out in two stages,of which in the first stage obtains the optimal facing air velocity and water-to-air ratio by testing the influence of different facing air velocities and water-to-air ratios on the resistance and efficiency with spray water temperature setting as wet-bulb temperature of inlet air,and in second stage tests the influence of spray water temperature on the water evaporator efficiency.Data processing and analyses show that the optimal facing air velocity is 1.0 m/s,and the optimal water-to-air ratio is 0.1,and that the evaporative cooling efficiency and sensible cooling capacity decrease when spraying water temperature rises.According to the regulation of actual refrigeration capacity of cooling machine higher than 95% of the rating value,suggests that the spray water temperature be in the range of 20.13 ℃ to 25.86 ℃.