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Impacts of Airtightening Retrofits on Ventilation Rates and Energy Consumption in a Manufactured Home

Published

Author(s)

Steven J. Nabinger, Andrew K. Persily, William S. Dols

Abstract

A retrofit study was conducted in a manufactured house to investigate the impacts of airtightening on ventilation rates and energy consumption. This paper describes the retrofits and the results of the pre- and post-retrofit assessment of building airtightness, ventilation, and energy use. Building envelope and air distribution systems airtightness were measured using fan pressurization. Air change rates were measured continuously using the tracer gas decay technique. Energy consumption associated with heating and cooling was monitored through measurement of gas consumption by the forced-air furnace for heating and electricity use by the air-conditioning system for cooling. The results of the study show that the retrofits reduced building envelope leakage by about 18 % and duct leakage by about 80 %. The reduction in the house infiltration rates depended on weather conditions and the manner in which the heating and cooling system was controlled, but in general these rates were reduced by about one third. The energy consumption of the house for heating and cooling were reduced by only about 10 %, which is relative small but not totally unexpected given that infiltration only accounts for a portion of the heating and cooling load. An existing multizone airflow model of the building was modified to reflect the airtightening retrofits, and the predicted infiltration rates agreed well with the measured values over a range of weather and system operation conditions.
Citation
Technical Note (NIST TN) - 1673
Report Number
1673

Keywords

duct leakage, energy consumption, manufactured housing, mechanical ventilation, residential, retrofit, ventilation

Citation

Nabinger, S. , Persily, A. and Dols, W. (2010), Impacts of Airtightening Retrofits on Ventilation Rates and Energy Consumption in a Manufactured Home, Technical Note (NIST TN), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=906322 (Accessed May 26, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created September 30, 2010, Updated February 19, 2017