在室外温度较低的情况下，通过利用排出空气中的一些可用能量来预热供应的新鲜空气，可以减少空调系统从加热设备中吸取的能量。将新鲜空气与空间中排出的空气混合，使其能够再循环，是一种常用的方法。然而，当禁止空气再循环时，必须考虑替代能源回收方法。本文描述了加拿大艾伯塔省埃德蒙顿市埃德蒙顿总医院安装的能量回收系统，并给出了该系统性能的实验研究结果。空调系统的设计目的是在室外设计温度为-40华氏度时处理102000立方英尺（cfm）的空气，并在80华氏度和50%相对湿度的房间设计条件下排出84000立方英尺（cfm）的空气。 容积差用于污染的补充空气和建筑物增压。该系统使用带有适当加热和冷却盘管的喷水洗涤器，在恒定温度下将空气从机组中排出，并在整个建筑中使用末端再热。引文:ASHRAE交易，第77卷，第2部分，华盛顿特区

At low outdoor temperatures, the energy drawn from the heating plant by the air conditioning system may be reduced by utilizing some of the available energy in the exhausted air to preheat the fresh air supplied. The mixing of fresh air and air exhausted from spaces that allow it to be recirculated is a frequently used method. However, alternative energy recovery methods must be considered when recirculation of air is prohibited.This paper describes the energy recovery system installed in the Edmonton General Hospital at Edmonton, Alberta, Canada, and presents the results of an experimental study of the performance of this system.The air conditioning system is designed to handle 102,000 cfm of air at an outdoor design temperature of -40 F and to exhaust 84,000 cfm of air at a room design condition of 80 F and 50% rh. The difference in volume is being used for contaminated make-up air and pressurization of the building. The system utilizes a spray washer with the appropriate heating and cooling coils to deliver air off the unit at a constant temperature, and terminal reheat is used throughout the building.