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Title: Estimating Foundation Water Vapor Release Using a Simple Moisture Balance and AIM-2: Case Study of a ContemporaryWood-Frame House

Source: In: Thermal Performance of the Exterior Envelopes of Whole Buildings XI International Conference,

Author(s)Boardman, C.R.; Glass, Samuel V.; Carll, Charles G.

Publication Year: 2010  View PDF »

Category: Conference Proceedings
Associated Research Project(s):   FPL-4723-1

Abstract: Proper management of indoor humidity in buildings is an essential aspect of durability. Following dissipation of moisture from construction materials, humidity levels during normal operation are generally assumed to primarily depend on the building volume, the number of building occupants and their behavior, the air exchange rate, and the water vapor content ofoutdoor air A potentially large additionalsource ofindoor humidity that often is not considered is the building foundation, which is in contact with earth that commonly damp. Recent work has suggested that the rate of water vapor release from foundations may vary with season, withfoundation temperature, and with indoor humidity. This workpresents resultsfrom a casestudy of a house with a wood foundation system in which we estimatefoundation moisture release given basic interior and exterior conditions, such as relative humidity, temperature, and wind speed. The Alberta air infiltration model was calibratedusing tracergas measurements in the house and usedto model air exchange. We use a simplified moisture balance model to estimate the hourly rate of foundation moisture releasefrom the basement. This rate ispresented and shown to correlate with stack-driven air exchange for this wood foundation system.

Keywords: Dwellings; heating control; ventilation control; wooden buildings; moisture; building moisture; dwelling moisture; building dampness; humidity control; wooden-frame houses; environmental engineering; testing; wood moisture; building testing; weathering; airtightness; mathematical models; temperature; foundations; water vapor; moisture control; moisture content; durability

Publication Review Process: Formally Refereed

File size: 617 kb(s)

Date posted: 01/10/2011

This publication is also viewable on Treesearch:  view
RITS Product ID: 37896
Current FPL Scientist associated with this product
Glass, Samuel V.
Research Physical Scientist

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