直接空冷喷淋冷却系统蒸发特性研究

基于直接空冷喷淋冷却系统的水滴蒸发过程,建立了水滴的蒸发模型,并利用该模型计算分析水滴直径、环境温度、湿度以及大气压力等因素对水滴蒸发特性的影响.分析结果表明,雾滴在空气中的蒸发时间与雾滴直径的平方成正比；对于绝热增湿式喷淋冷却系统,建议喷淋雾滴直径不大于40 μm；大气压力对雾滴蒸发特性几乎无影响,空气温度对雾滴的蒸发特性影响较小,空气湿度对雾滴蒸发特性的影响较大,建议将喷淋后的空气湿度控制在75％以下,且绝热增湿式喷淋降温系统不适用每年最热3个月平均空气湿度大于60％的地区.

EVAPORIZATION CHARACTERISTICS OF THE DIRECT-COOLING SPRAYING SYSTEM

To analyze the evaporization characteristic of water droplet(which vaporized in the direct air-cooling spraying system) and the influence of factors such as droplet diameter,environmental temperature and humidity,and atmospheric pressure on the evaporization characteristics,an evaporization model of the water droplet was established.Results show that,the evaporization time of the droplet in air is directly proportional to square of the droplet diameter.For the spray cooling system with adiabatic humidification,the authors suggest that the spray droplet diameter should not be larger than 40μm.The environmental temperature has a little influence on the droplet evaporization characteristics.However,the humidity has a greater one.Thus,environmental humidity should be controlled below 75%,and the spray cooling system with adiabatic humidification is not applicable to areas where the average humidity of the 3 hottest months of a year is higher than 60%.The atmospheric pressure almost has no effect on the evaporization characteristics.