LO-09-087-2009

Indoor Moisture in 30 Homes Using Unvented Gas Fireplaces


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标准号
LO-09-087-2009
发布日期
2009年01月01日
实施日期
2010年02月18日
废止日期
中国标准分类号
/
国际标准分类号
/
发布单位
ASHRAE - American Society of Heating@ Refrigerating and Air-Conditioning Engineers@ Inc.
引用标准
10
适用范围
ABSTRACT 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?F (10??@ which is approximately the dew-point required for condensation on a double-pane window when the indoor temperature is 70?F (21??and the outdoor temperature is 10?F (?C12??.




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