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Title: Building America Case Study: Predicting Envelope Leakage in Attached Dwellings (Fact Sheet)

'The cost for blower testing is high, because it is labor intensive, and it may disrupt occupants in multiple units. This high cost and disruption deters program participants, and dissuades them from pursuing energy improvements that would trigger air leakage testing, such as improvements to the building envelope.' This statement found in a 2012 report by Heschong Mahone Group emphasizes the importance of reducing the cost and complexity of blower testing in multifamily buildings. Energy efficiency opportunities are being bypassed. The cost of single blower testing is on the order of $300. The cost for guarded blower door testing, the more appropriate test for assessing energy savings opportunities, could easily be six times that and that's only if you have the equipment and simultaneous access to multiple apartments. Thus, the proper test is simply not performed. The objective of the 2013 research project was to develop the model for predicting fully guarded test results (FGT), using unguarded test data and specific building features of apartment units. The model developed has a coefficient of determination R2 value of 0.53 with a root mean square error (RMSE) of 0.13. Both statistical metrics indicate that the model is relatively strong. When tested againstmore » data that was not included in the development of the model, prediction accuracy was within 19%, which is reasonable given that seasonal differences in blower door measurements can vary by as much as 25%.« less
Publication Date:
OSTI Identifier:
1167075
Report Number(s):
DOE/GO-102014-4501
KNDJ-0-40342-00
DOE Contract Number:
AC36-08GO28308
Resource Relation:
Related Information: Technology Solutions for New and Existing Homes, Energy Efficiency & Renewable Energy (EERE); Work performed by Consortium for Advanced Residential Buildings (CARB)
Research Org:
National Renewable Energy Laboratory (NREL), Golden, CO.
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy Building Technologies Office
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION RESIDENTIAL; RESIDENTIAL BUILDINGS; CARB; BUILDING AMERICA; BLOWER DOOR TESTING; ENVELOPE LEAKAGE; SINGLE-FAMILY ATTACHED HOUSING; MULTIFAMILY APARTMENTS; GUARDED; UNGUARDED; PREDICTING FULLY GUARDED TEST RESULTS; BUILDING AMERICA; EMPIRICAL MODEL; MULTI-LINEAR REGRESSION MODEL