ASHRAE Standard 90.1 metal building u-factors--Part 4: development of U-factors for walls and roofs based on experimental measurements.(Report): An article from: ASHRAE Transactions

This digital document is an article from ASHRAE Transactions, published by American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc. on January 1, 2010. The length of the article is 5485 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available immediately after purchase. You can view it with any web browser.

From the author: It is critical to know or measure the installed insulation profile in metal building roof and wall systems to determine the effective thermal resistance with acceptable accuracy. Guarded hot box tests and finite element models can be precise, but are accurate only if the modeled cross-sections correctly represent the insulation system as practically constructed. In cooperation with others on the Metal Building Task Group reporting to the ASHRAE SSPC 90.1 Envelope Subcommittee, we developed recommendations for modified thermal transmittance values for metal building insulation systems to reflect current common construction practices as explained in this paper. The current version of ASHRAE 90.1 over-estimates the thermal performance of "over-the-purlin" insulation for roofs and walls by approximately 20%

Citation Details
Title: ASHRAE Standard 90.1 metal building u-factors--Part 4: development of U-factors for walls and roofs based on experimental measurements.(Report)
Author: Les Christianson
Publication:ASHRAE Transactions (Magazine/Journal)
Date: January 1, 2010
Publisher: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc.
Volume: 116 Issue: 1 Page: 189(7)

Article Type: Report

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