本文展示了如何为简单的暖通空调配置制定空对空热量和能量系统设计问题，并在保持较小回收期的同时，以最小的生命周期成本系统解决这些问题。给出了数学表达式和设计表，以方便设计过程。该设计过程以芝加哥市为例，该市暖通空调应用中同时存在较大的热负荷和冷负荷。给出的设计问题示例表明，能源轮的投资回收期通常不到一年，有时显热交换器的投资回收期也不到一年。辅助加热和冷却通风空气的寿命周期成本节约远远超过能量交换器的资本成本（合理或全部），即使仅考虑十年的寿命周期。单元:干燥:研讨会论文，加利福尼亚州阿纳海姆，2004年

This paper shows how air-to-air heat and energy system design problems can be formulated for a simple HVAC configuration and solved for the least life-cycle cost system while still retaining a small payback period. Mathematical expressions and design tables are presented to facilitate the design process. The design process is illustrated for the city of Chicago where both large heating and cooling loads occur in HVAC applications. The example design problem presented shows that payback periods of less than one year are often achieved for energy wheels and sometimes for sensible heat exchangers. The life-cycle cost savings for auxiliary heating and cooling ventilation air far exceeds the capital cost of the energy exchanger (sensible or total), even when only a ten-year life cycle is considered.Units: SI