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WUFI-ORNL/IBP - A North American Hygrothermal Mode

Karagiozis, A. and Kščnzel, H. M.
2001
Proceedings for Performance of Exterior Envelopes of Whole Buildings VIII: Integration of Building Envelopes, December 2-7, Clearwater Beach, Florida


Karagiozis, A. and Kščnzel, H. M., (2001), "WUFI-ORNL/IBP - A North American Hygrothermal Mode", Proceedings for Performance of Exterior Envelopes of Whole Buildings VIII: Integration of Building Envelopes, December 2-7, Clearwater Beach, Florida.
Abstract:

ABSTRACT

Building envelope designers and architects provide expert advice during the selection of building envelope systems. Until recently, a limited hygrothermal engineering analysis was performed to determine performance of a selected wall system other than review the details of wall systems and subsystems. Infrequently, a glaser or dew point method analysis may have also been performed, but this kind of analysis is only steady state in nature and ignores the hygroscopic effects, such as nonlinear dependenc ies of hygroscopic material properties, moisture storage, freeze-thawing mechanisms, liquid transport, latent heat, and transient nature of moisture loads at the boundaries. The main reason for not performing a thorough moisture engineering analysis was the lack of an easy-to-use hygrothermal model that integrated the physics and that was accompanied by a material property database and a set of realistic hygrothermal environmental loads for both the interior and exterior of the envelope. Recently, the increasing demand for better performing calculation methods to assess the moisture behavior of building components prompted an international collaboration between the Oak Ridge National Laboratory (USA) and the Fraunhofer Institute in Bauphysics (Germany) to develop a hygrothermal design tool named WUFI-ORNL/IBP. This hygrothermal design model can assess the response of building envelope systems in terms of heat and moisture loads and can also provide a very useful and fair method for evaluating and optimizing building envelope designs. This state-of-the-art model is discussed in detail in this paper and is also available in North America free of charge at www.ornl.gov/btc/ moisture.


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Author Information and Other Publications Notes
Karagiozis, A.
Achilles N. Karagiozis, Oak Ridge National Laboratory, Building Technology Center, Oak Ridge
  1. A North American research approach to moisture design by modeling
  2. Advanced hygrothermal modeling of building materials using MOISTURE-EXPERT 1.0
  3. Advanced hygrothermal models and design models
  4. An educational hygrothermal model: WUFI-ORNL/IBP
  5. Applied moisture engineering
  6. Barrier EIFS clad walls: Results from a moisture engineering study
  7. Boundary element analysis of uncoupled quasi-static hygrothermoelasticity for two-dimensional composite walls
  8. Building enclosure hygrothermal performance study phase I
  9. Drying capabilities of wood frame walls with wood siding
  10. EIFS hygrothermal performance due to initial construction moisture as a function of air leakage, interior cavity insulation, and climate conditions
  11. Hygrothermal system-performance of a whole building
  12. Importance of moisture control in building performance
  13. Influence of material properties on the hygrothermal performance of a high-rise residential wall
  14. Integrated approaches for moisture analysis
  15. Integrated hygrothermal performance of building envelopes and systems
  16. Measurements and two-dimensional computer simulations of the hygrothermal performance of a wood frame wall
  17. Moisture transport in building envelopes using an approximate factorization solution method
  18. Position paper on material characterization and HAM model benchmarking
  19. Simulation of indoor temperature and humidity conditions including hygrothermal interactions with the building envelope
  20. Wind-driven rain distributions on two buildings  
Kščnzel, H. M.
Fraunhofer-Institute for building physics (Director: Prof. Dr.-Ing. habil. Dr. h.c. mult. Dr. E.h. mult. K. Gertis)
  1. Calculation of heat and moisture transfer in exposed building components
  2. Combined effect of temperature and humidity of the detoriation process of insulation materials in ETICS
  3. Flexible vapor control solves moisture problems of building assemblies - smart retarder to replace the conventional PE-film
  4. Moisture buffering effects of interior linings made from wood or wood based products
  5. Mold growth prediction by computational simulation
  6. Simulation of indoor temperature and humidity conditions including hygrothermal interactions with the building envelope
  7. Simultaneous heat and moisture transport in building components. one- and two-dimensional calculation using simple parameters
  8. Two-dimensional transient heat and moisture simulations of rising damp with WUFI 2D
  9. Uncertainty of hygrothermal calculations  



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