由于蒸汽加湿能力和能耗的实际限制，计算机房HVAC系统通常无法使用省煤器冷却循环。此外，对于自由冷却循环期间所需的大量低湿度外部空气，现有成套系统的加湿能力不足。在研究了最常用的干湿过程后，作者介绍了一种将蒸发冷却与省煤器循环和可变风量相结合的干湿过程，它可能在节能方面提供一些有趣的优势，并放宽了机房的蒸汽屏障要求。引文:研讨会，ASHRAE交易，1985年，第91卷，pt。1B芝加哥

Practical limitations of steam humidification capacity and energy consumption often preclude the use of economizer cooling cycles for computer room HVAC systems. Also, available packaged systems have inadequate humidification capacity for the large volumes of low-moisture outside air that are necessary during the free cooling cycle.After examining the most commonly used psychrometric processes, the author introduces one that integrates evaporative cooling with an economizer cycle and variable air volume that may offer some interesting advantages in energy conservation and relaxed vapor barrier requirements for computer rooms.