Air-to-air heat recovery devices for small buildings.

Presents the operating principles for four basic types of air-to-air heat exchangers suited for small scale use: rotary, coil-loop, heat pipe and plate. Discusses individual advantages and disadvantages. Describes test program initiated to evaluate the performance of a few commercial units as well as several units designed and/or built at the University of Alaska. Presents preliminary results from several of these tests along with a critique on theirdesign. Gives a short list of manufacturers of air-to-air heat exchangers in the appendix.