作为对空-空热交换器运行特性调查的一部分，确定了产生结霜的限制条件，以及防止结霜和积冰的规定是否充分。对于各种类型的能量回收系统，还研究了排气对新鲜空气的交叉泄漏或污染。引用:ASHRAE交易，第87卷，第一部分，伊利诺伊州芝加哥

As part of an investigation on the operating characteristics of air-to-air heat exchangers, the limiting conditions that produce frosting were determined as well as the adequacy of provisions for the prevention of frosting and ice buildup. Also investigated for various types of energy recovery systems was the cross leakage or contamination of the fresh air by the exhaust air.