S26 -- Air-to-Air Energy Recovery Equipment (SI)

Air-to-air energy recovery is the process of recovering heat or/and moisture between two airstreams at different temperatures and humidities. This process is important in maintaining acceptable indoor air quality (IAQ) while maintaining low energy costs and reducing overall energy consumption. This chapter describes various technologies for air-to-air energy recovery. Thermal and economic performance, maintenance, and related operational issues are presented, with emphasis on energy recovery for ventilation. Applications Basic Heat or Heat and Water Vapor Transfer Relations Types of Air-to-Air Heat Exchangers Performance Ratings Additional Technical Considerations Types and Applications of Air-to-Air Heat Exchangers Comparison of Air-to-Air Heat or Heat and Mass Exchanger Characteristics Use of Air-to-Air Heat or Heat and Mass Exchangers in Systems Economic Considerations Energy and/or Mass Recovery Calculation Procedure Symbols