人类长期持续的“温室效应”和我们最近对全球“臭氧层”的氟氯化碳中毒，引发了永久性的天气变化。从去年夏天开始，全球气温上升、湿度下降、紫外线辐射增加以及粮食供应受到严重影响将困扰我们。考虑到人口增长和天气趋势，面对价格高昂但不断减少的制冷剂供应以及不断上升的电力和燃料成本，冷却需求将增加。 此外，由于环境温度升高，以及参议院去年3月批准的31国CFC控制计划几乎强制要求更换制冷剂，传统空调的效率和容量将降低。直接蒸发冷却，尤其是间接蒸发冷却，可以通过几种方式帮助应对即将到来的紧急情况:它们不使用CFC，节省大量电力和维护，通过廉价预冷补给、回流和冷凝器冷却空气，大大提高制冷输出和经济性。 一些地区的新装置可能会采用前所未有的蒸发冷却，但大规模替代现有的传统冷却似乎不太可能，在其他地方，该行业必须为难以置信地快的繁荣时期做好准备，促进而不是取代制冷剂冷却。引文:研讨会，ASHRAE交易，第95卷，pt。1989年，芝加哥

Man’s long and persistent building of the "green. house effect" and our recent CFC poisoning of the global "ozone layer" have launched permanent weather changes. Rising world temperatures, falling humidities, increasing ultraviolet radiation, and radically affected food supplies will plague us, beginning last summer.Considering population growth and weather trends, the demand for cooling will increase in the face of highly priced but diminishing refrigerant supplies and continuously rising power and fuel costs.Further, conventional air-conditioning efficiencies and capacities will be cut by higher ambient temperatures and by refrigerant substitutions made almost mandatory by the Senate’s ratification last March of the 31-nation CFC control program.Direct and especially indirect evaporative cooling can help meet the coming emergency in several ways: they use no CFCs, save much power and maintenance, and greatly boost refrigerative cooling outputs and economies by cheaply precooling makeup, return, and condenser cooling air.New installations in some areas may employ unprecedented amounts of evaporative cooling, but mass replacement of existing conventional cooling seems unlikely, Everywhere else the industry must prepare for boom times unbelievably soon, boosting, not supplanting, refrigerafive cooling.