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Title: Analyzing Design Heating Loads in Superinsulated Buildings

The U.S. Department of Energy’s Building America research team Consortium for Advanced Residential Buildings (CARB) worked with the EcoVillage cohousing community in Ithaca, New York, on the Third Residential EcoVillage Experience neighborhood. This communityscale project consists of 40 housing units—15 apartments and 25 single-family residences. Units range in size from 450 ft2 to 1,664 ft2 and cost from $80,000 for a studio apartment to $235,000 for a three- or four-bedroom single-family home. For the research component of this project, CARB analyzed current heating system sizing methods for superinsulated homes in cold climates to determine if changes in building load calculation methodology should be recommended. Actual heating energy use was monitored and compared to results from the Air Conditioning Contractors of America’s Manual J8 (MJ8) and the Passive House Planning Package software. Results from that research indicate that MJ8 significantly oversizes heating systems for superinsulated homes and that thermal inertia and internal gains should be considered for more accurate load calculations.
  1. Consortium for Advanced Residential Buildings, Norwalk, CT (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
NREL/SR-5400-64236; DOE/GO-102015-4673
DOE Contract Number:
AC36-08GO28308; KNDJ-0-40342-04
Resource Type:
Technical Report
Resource Relation:
Related Information: Work performed by Consortium for Advanced Residential Buildings, Norwalk, Connecticut
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Building Technologies Office (EE-5B)
Country of Publication:
United States
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; residential; Residential Buildings; CARB; Building America; low load; super-insulated; Passive House; Manual J8; Cimate Zone 6; design heat load