OR-05-11-1 - Cost-Effective Design of Dual Heat and Energy Recovery Exchangers for 100% Ventilation Air in HVAC Cabinet Units PDF

This paper shows how a combined air-to-air heat and energy recovery system design problem can be formulated for HVAC cabinet units and solved for the least life-cycle cost system while still retaining a small time period payback. Mathematical expressions are presented to address the complicating interaction between the components of the unit to facilitate the design process. The design process is illustrated for the city of Chicago where both large heating and cooling loads occur in HVAC applications. The example design problem presented shows that payback periods of a little over a year are often achieved for retrofitted units, and the life-cycle cost savings for auxiliary heating and cooling ventilation air far exceeds the capital cost even when only a 10-year life cycle is considered.

Units: SI