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The dynamic modelling of air humidity behaviour in a multi-zone space

Diasty, R., Fazio, P. and Budaiwi, I.
1993
Building and Environment, 28(1): 33-51

Diasty, R., Fazio, P. and Budaiwi, I., (1993), "The dynamic modelling of air humidity behaviour in a multi-zone space", Building and Environment, 28(1): 33-51.
Abstract:
Single-zone dynamic modelling of air humidity can fairly account for most moisture transfer processes in single-zone buildings. However, such models cannot truly represent air humidity behaviour in most building since they have distinct interior partitioning of their volumes. A dynamic model to describe the air humidity behaviour and to determine its variations in a multi-zone space is proposed. The model accounts for boundary conditions variation from one zone to another, the different zonal interaction with the outdoor environment and the individual zonal functional and physical characteristics. The model accounts for both diffuse moisture transfer and convective moisture transfer due to inter-zonal air movement. A multi-cell air flow model that accounts for individual zone air flow, air flow through the envelope in each zone and the inter-zonal air flow is incorporated. Air humidity within each zone is determined through a simultaneous solution of a set of linear algebraic equations using time dependent humidity parameters. A discrete time interval approach was used since most moisture transfer processes are not continuous in nature. A case study on a six-zone building space is presented to demonstrate the air humidity behaviour in a multi-zone space as well as to examine the effect of the influencing parameters such as wind speed and direction, air leakage characteristics, indoor moisture generation, surface condensation, inter-zonal air temperature variation, and building materials absorption and desorption. The results also showed the uniqueness of individual zones air humidity behaviour and its dependence on its relative location along the building air humidity flow path.

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Author Information and Other Publications Notes
Diasty, R.
School of Architecture, Ariona State University, Tempe, AZ 85287-1605 (USA)
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Fazio, P.
Paul Fazio, Professor of Building, Civil & Environmental Engineering, Concordia University, Montreal
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  3. A new testing method to evaluate the relative drying performance of different building envelope systems using water trays
  4. A quantitative study for the measurement of driving rain exposure in the Montr¨¦al region
  5. A review of research activities in energy efficiency in buildings in Canada
  6. Airtightness testing and air flow modeling of two and three-unit multifamily buildings
  7. Airtightness testing of two- and three-unit buildings with a single fan
  8. Approach for the simulation of wetting due to rain infiltration for building envelope testing
  9. Approach for urban driving rain index by using climatological data recorded at suburban meteorological station
  10. Behavior of wall assemblies with different wood sheathings wetted by simulated rain penetration
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  20. Development of HAM tool for building envelope analysis
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Budaiwi, I.
Associate Professor and Chairman, Architectural Engineering Dept., King Fahd Univ. of Petroleum and Minerals, Dhahran 31261, P.O. Box 1780, Saudi Arabia.
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