HAT循环逆流式湿化器的热力性能实验研究及冷却数计算

在理论分析湿化器内部传热传质机理的基础上，进行了湿化器总体热力性能试验，得出了在不同实验工况下，各测量参数对湿化器热力性能的影响规律，同时计算了冷却数，得出了其变化规律。结果表明：随水气质量比的增大，湿化器出口湿空气的温度、温升和出口水温都增大，而冷却数减少。在同一水气质量比下，随进口水温升高，出口湿空气温度、温升和出口水温都增大，冷却数减少。在各实验工况下，湿化器的出口湿空气都具有很高的相对湿度，达到或接近饱和状态。冷却数降低对系统有利，但不是越低越好，应该优化选择最佳值。

Thermodynamic Performance Experimental Study and Cooling Number Calculation of Counter-flow Spray Humidifier in HAT Cycle

An experimental study of integral thermal performance was conducted for a counter-flow spray humidifier on the basis of theory analyzing the mechanism of the heat and mass transferring inside the humidifier. The effecting rule of every measuring parameter to thethermal performance of the humidifier was obtained under different experimental conditions. Spontaneously the cooling number was calculated and its varying rule was also obtained. The results showed that with an increase in water-air mass ratio, there will be a corresponding increase in humid air temperature, temperature rise at the outlet of the humidifier and outlet water temperature, but decrease in cooling number. With same water-air mass ratio, the same results will be obtained. Under all experimental conditions the moist air at the humidifier outlet has very high relative humidity to nearly approach or attain the saturation. The system can benefit from decreasing in cooling number. However it is not the better the lower, it should be optimized.