A parametric study of energy savings from cleaning coils and filters in constant air volume HVAC systems

Abstract

This study evaluates the energy savings resulting from the remediation of coil and filter fouling in constant air volume HVAC systems in residential and small commercial buildings. A computer model was developed to simulate the behavior of buildings and their duct systems under various levels of fouling. The model was verified through laboratory and field testing. Parametric simulation and sensitivity analysis results suggest that although fouling can have an impact on both air conditioner and furnace energy use, for the levels of fouling found in the literature, energy savings will be negligible for residential buildings and negative for small commercial buildings.

Acknowledgments

The authors would like to thank: the National Air Duct Cleaners Association (NADCA) for providing the funding for this research; Bill Lundquist, the NADCA member in charge of the project, for his guidance and feedback; and Monster Vac Inc., for their HVAC system cleaning services as part of field testing.

Eric J. H. Wilson, Associate Member ASHRAE, is Research Engineer. James S. McNeill, Associate Member ASHRAE, is Sustainable Design Consultant. Zhiqiang (John) Zhai, PhD, Member ASHRAE, is Associate Professor. Moncef Krarti, PhD, PE, LEED-AP, Member ASHRAE, is Professor.