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Accession Number DE2012-1052950
Title Post-Retrofit Residential Assessments.
Publication Date Apr 2012
Media Count 66p
Personal Author L. Lutzenhiser M. Moezzi R. Lancaster S. Chandra S. Widder
Abstract This study examined a range of factors influencing energy consumption in households that had participated in residential energy-efficiency upgrades. The study was funded under a subcontract with the U.S. Department of Energy's Pacific Northwest National Laboratory and was conducted by faculty and staff of Portland State University Center for Urban Studies and Department of Economics. This work was made possible through the assistance and support of the Energy Trust of Oregon (ETO), whose residential energy-efficiency programs provided the population from which the sample cases were drawn. All households in the study had participated in the ETO Home Performance with Energy Star (HPwES) program. A number of these had concurrently pursued measures through other ETO programs. Post-retrofit energy outcomes are rarely investigated on a house-by-house basis. Rather, aggregate changes are ordinarily the focus of program impact evaluations, with deviation from aggregate expectations chalked up to measurement error, the vagaries of weather, and idiosyncrasies of occupants. However, understanding how homes perform post-retrofit on an individual basis can give important insights to increase energy savings at the participant and the programmatic level. Taking a more disaggregated approach, this study analyzed energy consumption data from before and after the retrofit activity and made comparisons with engineering estimates for the upgrades, to identify households that performed differently from what may have been expected based on the estimates. A statistical analysis using hierarchal linear models, which accounted for weather variations, was performed looking separately at gas and electrical use during the periods before and after upgrades took place. A more straightforward comparison of billing data for 12-month periods before and after the intervention was also performed, yielding the majority of the cases examined. The latter approach allowed total energy use and costs to be assessed but did not account for weather variation.
Keywords Assessments
Comparisons
Energy consumption
Energy efficiency
Houses
Residential buildings
Retrofitting
Statistical analysis
Upgrades
Weather variations

 
Source Agency Technical Information Center Oak Ridge Tennessee
NTIS Subject Category 97B - Energy Use, Supply, & Demand
97G - Policies, Regulations & Studies
89B - Architectural Design & Environmental Engineering
Corporate Author Pacific Northwest National Lab., Richland, WA.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1307
Contract Number N/A

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