Approach for opaque envelope U-factors for ASHRAE/IESNA 90.1-1989R

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:211843

Hogan, J F ^[1]

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1. Seattle Dept. of Construction and Land Use, Seattle, WA (United States)

Following the direction of the ASHRAE Board of Directors, and in response to the 1992 National Energy Policy Act (EPAct) which references it, the next version of ASHRAE/IESNA Standard 90.1 is being developed as a code and written in code language. To achieve successful implementation as a code, the requirements for the opaque envelope are proposed to be developed based on typical building practices. Calculation methodologies will be specified in much greater detail, and precalculated tables of assembly U-factors will be provided and required to be used where appropriate, so that the intent is clear and compliance can be more easily verified. This paper summarizes the assumptions used as of February 1995 in developing the criteria for ASHRAE/IESNA Standard 90.1-1989R and the proposed procedures for demonstrating compliance. The roofs, walls, and floors evaluated for concrete/masonry, wood frame, and metal building construction are described. Assembly constructions, framing factors, and calculation methodologies are cited. Example U-factor calculations are shown for each class of construction. Tables of U-factors are provided for over 2,500 roof, wall, and floor insulation options.

• OSTI ID: 211843
• Report Number(s): CONF-950624--
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
BASEMENTS
BUILDING MATERIALS
FLOORS
ROOFS
THERMAL MASS
U VALUES
WALLS