air to air heat exchanger

The work presented in this paper investigates frosting problem on high efficient air to air counter flow heat exchanger. The presented investigation consists of two main activities.  

Air-to-air heat and moisture exchange between exhaust and supply airflows can substantially reduce HVAC costs. This paper outlines the design considerations that should be included when selecting a type of exchanger and shows how the performance of each recovery device can be determined. Energy wheels, which transfers both heat and water vapor, are given special consideration. The HV AC design for heat and moisture exchanger sizing is presented as a least life-cycle cost design problem.