Indoor moisture in 30 homes using unvented gas fireplaces.(Report): An article from: ASHRAE Transactions
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ISBN / ASINB00371OVSQ
ISBN-13978B00371OVS7
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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 July 1, 2009. The length of the article is 4743 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: Water vapor is one of the primary products of combustion. Since unvented gas fireplaces release all combustion products into the home this means that a substantial amount of moisture is added to the indoor air during fireplace operation. An analysis of the indoor moisture levels in 30 homes using unvented gas fireplaces was performed using measurements from multiple locations in each home. Several different metrics were considered, including relative humidity (commonly used in assessments of comfort), vapor pressure (a temperature-independent metric), and dew-point (important for potential problems at surfaces). There was a median increase in vapor pressure of about 0.1 kPa (0.015 psi) for the sample of homes. Vapor pressures were typically fairly uniform within each home, with the most distant rooms often showing a slightly lower vapor pressure. The direction and magnitude of changes in relative humidity depended on the proximity to the fireplace, with locations further from the fireplace having higher relative humidity levels because of a lesser temperature influence. Dew-point levels rarely exceeded 50[degrees]F (10[degrees]C), which is approximately the dew-point required for condensation on a double-pane window when the indoor temperature is 70[degrees]F (21[degrees]C)and the outdoor temperature is 10[degrees]F (-12[degrees]C).
Citation Details
Title: Indoor moisture in 30 homes using unvented gas fireplaces.(Report)
Author: Paul W. Francisco
Publication:ASHRAE Transactions (Magazine/Journal)
Date: July 1, 2009
Publisher: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc.
Volume: 115 Issue: 2 Page: 914(10)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
From the author: Water vapor is one of the primary products of combustion. Since unvented gas fireplaces release all combustion products into the home this means that a substantial amount of moisture is added to the indoor air during fireplace operation. An analysis of the indoor moisture levels in 30 homes using unvented gas fireplaces was performed using measurements from multiple locations in each home. Several different metrics were considered, including relative humidity (commonly used in assessments of comfort), vapor pressure (a temperature-independent metric), and dew-point (important for potential problems at surfaces). There was a median increase in vapor pressure of about 0.1 kPa (0.015 psi) for the sample of homes. Vapor pressures were typically fairly uniform within each home, with the most distant rooms often showing a slightly lower vapor pressure. The direction and magnitude of changes in relative humidity depended on the proximity to the fireplace, with locations further from the fireplace having higher relative humidity levels because of a lesser temperature influence. Dew-point levels rarely exceeded 50[degrees]F (10[degrees]C), which is approximately the dew-point required for condensation on a double-pane window when the indoor temperature is 70[degrees]F (21[degrees]C)and the outdoor temperature is 10[degrees]F (-12[degrees]C).
Citation Details
Title: Indoor moisture in 30 homes using unvented gas fireplaces.(Report)
Author: Paul W. Francisco
Publication:ASHRAE Transactions (Magazine/Journal)
Date: July 1, 2009
Publisher: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc.
Volume: 115 Issue: 2 Page: 914(10)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
