Energy Use of Residential Refrigerators and Freezers: Function Derivation Based On Household Characteristics

Speaker(s): 
Date: 
June 20, 2011 - 11:30am
Location: 
90-3122
Seminar Host/Point of Contact: 

Field-metered energy use data for 1,467 refrigerators and 185 freezers from seven studies conducted between 1992-2010 were used to calculate usage adjustment factors (UAFs), defined as the ratio of measured to tested annual energy use. Multiple regressions of UAFs against several household and climate variables were then performed to obtain separate predictive functions for primary (most-used) refrigerators, secondary (second most-used) refrigerators, and freezers, and residual differences between observed and modeled UAFs were fit to log normal distributions. These UAF functions were used to project energy use in the nearly 4,000 households in the 2005 Residential Energy Consumption Survey (RECS), a statistical representation of U.S. homes. These energy use projections formed the basis of calculating lifecycle energy savings for more efficient refrigerators and freezers, as well as national energy and cost savings. Results were compared with previous published work by the Department of Energy, demonstrating how UAFs impact energy and cost savings.

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