- Author
-
Burch, D. M.
|
Thomas, W. C.
- Title
- MOIST: A PC Program for Predicting Heat and Moisture Transfer in Building Envelopes. Version 2.0.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
Virginia Polytechnic Institute and State Univ., Blacksburg, VA
- Sponsor
- Department of Energy, Washington, DC
- Report
-
NIST SP 853,
September 1993,
75 p.
- Distribution
- Available from National Technical Information Service
- Keywords
-
building technology
|
computer programs
|
heat transfer
|
moisture control
|
moisture transfer
|
wall performance
|
capillary flow
- Abstract
- CURRENT VERSION See: NIST SP 917 - Version 3.0 This report is a users manual for a computer program called MOIST. MOIST is a user-friendly personal computer program that predicts the one-dimensional transfer of heat and moisture in multi-layer walls, cathedral ceilings, and low-sloped roofs. The algorithms in the program predict moisture transfer in the diffusion through the capillary flow regimes. The program has a provision to account for convective moisture transfer by including embedded cavities which may be coupled to indoor and/or outdoor air. The user can readily include the water-vapor resistance offered by paint layers, wallpaper, and vapor retarders in simulations. The program generates a plot on the computer screen of the average moisture content of the construction layers versus time of year as the program executes. The program generates output files which may be imported into plotting programs for preparing reports.