在最简单的形式中，旋转式空气-空气热交换器（“热轮”）通常只在两股气流之间交换显热，尽管有几家制造商提供了一种浸渍干燥剂的类型，这种类型也可以将水分从一股气流转移到另一股气流。当建筑物或系统需要大量排气，因此需要大量补充空气时，通常使用换热器。将旋转式空气-空气热交换器并入系统的重要第一步是验证是否需要大量新鲜空气和排气。本文探讨了可供选择的方案、使用经济学和操作特性。引文:德克萨斯州达拉斯ASHRAE交易会第82卷第1部分研讨会

In their simplest form, rotary air-to-air heat exchangers "heat wheels") typically exchange sensible heat only between two air streams, although several manufacturers offer a desiccant impregnated type, which also transfers moisture from one air stream to the other. Exchangers are typically used when a building or system requires large quantities of exhaust, and thus large quantities of make-up air. An important first step in incorporating rotary air-to-air heat exchangers into a system is to verify the need for large quantities of fresh air and exhaust.This paper explores alternatives to consider, economics of use, and operating characteristics.