The nature, significance and control of solar-driven water vapor diffusion in wall systems--synthesis of Research Project RP-1235.(Report): An article from: ASHRAE Transactions
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ISBN / ASINB003QN3ZWI
ISBN-13978B003QN3ZW0
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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 4240 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: A project initiated by TC 4.4 looked at the nature, significance and control of solar-driven water vapor diffusion in wall systems. The project combined experimental and simulation work to provide an in-depth characterization of the phenomena occurring during inwards vapor diffusion in insulated wall assemblies. Small-and large-scale laboratory tests provided data under controlled conditions, indicating that porous claddings that absorb rain become the source of moisture when subjected to solar radiation. The vapor permeance of the interior finish layer is a key parameter leading to moisture accumulation in the gypsum board. Field studies were performed over a period of 2 years and occurrence of solar driven diffusion was documented for different wall assemblies. Once the capacity of computer models to reproduce the observed behavior was verified, a parametric study was performed for 18 different wall assemblies in seven locations in USA. It was found that the design of wall assemblies should include the evaluation of behavior under conditions leading to inwards diffusion in warm and mixed climates.
Citation Details
Title: The nature, significance and control of solar-driven water vapor diffusion in wall systems--synthesis of Research Project RP-1235.(Report)
Author: Dominique Derome
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: 572(9)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
From the author: A project initiated by TC 4.4 looked at the nature, significance and control of solar-driven water vapor diffusion in wall systems. The project combined experimental and simulation work to provide an in-depth characterization of the phenomena occurring during inwards vapor diffusion in insulated wall assemblies. Small-and large-scale laboratory tests provided data under controlled conditions, indicating that porous claddings that absorb rain become the source of moisture when subjected to solar radiation. The vapor permeance of the interior finish layer is a key parameter leading to moisture accumulation in the gypsum board. Field studies were performed over a period of 2 years and occurrence of solar driven diffusion was documented for different wall assemblies. Once the capacity of computer models to reproduce the observed behavior was verified, a parametric study was performed for 18 different wall assemblies in seven locations in USA. It was found that the design of wall assemblies should include the evaluation of behavior under conditions leading to inwards diffusion in warm and mixed climates.
Citation Details
Title: The nature, significance and control of solar-driven water vapor diffusion in wall systems--synthesis of Research Project RP-1235.(Report)
Author: Dominique Derome
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: 572(9)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
