WUFI-ORNL/IBP Hygrothermal Model

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Moisture engineering is becoming an important task in the overall design of building enclosures in both North America and Europe. Several methods may be used to design wall systems, and modeling is definitively the most flexible approach. There is an increasing demand for calculation methods to assess the moisture behavior of building components. In North America alone, the estimated cost in increased energy consumption due to the presence of moisture is approximately $1 billion dollars annually. Current tasks, such as preserving historical buildings or restoring and insulating existing buildings are closely related to the moisture tolerance in a building structure. ... continued below

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Karagiozis, A.N. August 8, 2001.

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Moisture engineering is becoming an important task in the overall design of building enclosures in both North America and Europe. Several methods may be used to design wall systems, and modeling is definitively the most flexible approach. There is an increasing demand for calculation methods to assess the moisture behavior of building components. In North America alone, the estimated cost in increased energy consumption due to the presence of moisture is approximately $1 billion dollars annually. Current tasks, such as preserving historical buildings or restoring and insulating existing buildings are closely related to the moisture tolerance in a building structure. Calculative analyses are becoming increasingly important due to the expensive and time-consuming experimental investigations and the limited transferability to real situations. The Oak Ridge National Laboratory (Building Technology Center) and the Fraunhofer Institute for Building Physics in an international collaboration h ave jointly developed a moisture engineering assessment model that predicts the transient transport of heat and moisture. This model, WUFI-ORNL/IBP is now available in North America free of charge, and can be downloaded via the Internet at: www.ornl.gov/btc/moisture. The unique features of this particular model are that it incorporates vapor and diffusion transport mechanism, along with realistic boundary conditions that include wind-driven rain. This alone may account for more than 80% of the total moisture load in envelopes. In addition this model is tailored to North American materials and construction practices and has a very friendly user interface that appeals to both architects and engineers. The model is also the most benchmarked hygrothermal model developed, since 1994. In this paper a brief description of the model will be given showing all needed inputs for a brick wall envelope system located in Montreal CANADA.

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  • Eighth Conference on Building Science and Technology, Toronto, Ontario (CA), 02/22/2001--02/23/2001

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  • Report No.: P01-111509
  • Grant Number: AC05-00OR22725
  • Office of Scientific & Technical Information Report Number: 788530
  • Archival Resource Key: ark:/67531/metadc717378

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • August 8, 2001

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

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  • March 24, 2016, 4:51 p.m.

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Karagiozis, A.N. WUFI-ORNL/IBP Hygrothermal Model, article, August 8, 2001; Tennessee. (digital.library.unt.edu/ark:/67531/metadc717378/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.