使用冷空气分配系统的强劲设计趋势通常在较低的送风温度（即40°F至45°F）下运行，为提高可变风量（VAV）系统的物理集成干燥剂、蒸发冷却和空气处理组件的成本效益提供了独特的机会。由于ASHRAE标准62-1981R要求更高的室外通风率，如果采用传统空调方法冷却，则将该空气制冷至40°F或45°F送风温度会产生更高的额外成本。新开发的集成干燥剂冷空气分配（IDCAD）系统可以与各种传统或先进的直接燃气干燥剂再生开发一起使用，预计将在2010年上市。不久的将来。IDCAD空气处理机组采用三个送风机: 一个用于热甲板，两个用于冷甲板，从而允许外部和内部占用区域的通风率分离。该设计特点允许显著减少管道系统中的建筑回风量，同时允许在单独服务的内部和外部占用建筑空间内，与传统设计的VAV系统相比，安全壳空间水平更低。后一种空气分配功能使人们能够充分利用weft已知的VAV节能，同时在其他变化的部分负荷条件下保持最大的设计“通风效率”，这将在涉及典型多用途商业建筑的设计研究中得到证明。对室外（即通风）空气进行干燥剂预处理，可以最大限度地减少室内空气质量控制对过度稀释空气流量的需求。目前，大多数传统设计的VAV系统都会出现病态建筑综合症（SBS）或建筑噪音- 相关疾病（BRI）。引用:研讨会，ASHRAE Trans。，第95卷，第。2.

Strong design trends toward the use of cold air distribution systems, which generally operate with lower supply air temperatures (i.e., 40°F to 45°F), provide unique opportunities to enhance the cost effectiveness of physically integrated desiccant and evaporative cooling and air-handling components of variable-air-volume (VAV) systems. With higher outdoor ventilation rates required by the proposed ASHRAE Standard 62-1981R, a higher premium cost is incurred for refrigerating this air to a 40°F or 45°F supply air temperature if cooled by conventional air-conditioning methods. The newly developed integrated desiccant cold air distribution (IDCAD) system can work with a variety of conventional or advanced direct gas-fired desiccant regeneration developments expected to be commercially available in.the near future.The IDCAD air-handling unit employs three supply fans: one for the hot deck and two for each cold deck, thereby allowing for separation of ventilation rates for both exterior and interior occupied zones. This design feature allows for significant reductions in the amount of building return air in ductwork while permitting lower containment space levels than conventionally designed VAV systems within separately served interior and exterior occupied building spaces.This latter air distribution feature allows one to take full advantage of weft-known VAV energy savings while maintaining maximum design "ventilation efficiency" at aft other varying part-load conditions, as will be demonstrated in a design study involving a representative multiuse commercial building. Use of desiccant pretreatment of outdoor (i.e., ventilation) air can minimize the need for excessively diluted air rates for indoor air quality controlm now a major problem with most conventionally designed VAV systems suffering from sick building syndrome (SBS) or building-related illness (BRI).