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Interzonal air and moisture transport through large horizontal openings in a full-scale two-story test-hut: Part 2- CFD study

Vera, S., Fazio, P. and Rao, J.
2009
Building and Environment, 45(3): 622-631
Horizontal opening; CFD; indoor zero-equation model; interzonal moisture flows; interzonal airflows; ventilation rate


Vera, S., Fazio, P. and Rao, J., (2009), "Interzonal air and moisture transport through large horizontal openings in a full-scale two-story test-hut: Part 2- CFD study", Building and Environment, 45(3): 622-631.
Abstract:
The aim of this paper is to study the air and moisture transport through a large horizontal opening in a full-scale two-story test-hut with mixed ventilation by means of computational fluid dynamics (CFD) simulations. CFD allows extending the experimental study presented in the companion paper [1] and overcoming some limitations of experimental data. More than 80 cases were simulated for conditions similar to those tested experimentally and for additional ventilation rates and temperature difference between the two rooms. CFD simulations were performed in Airpak and the indoor zero-equation turbulence model was used. The CFD model was extensively validated with the distributions of air speed, temperature and humidity ratio measured across the two rooms, as well as with the measured interzonal mass airflows through the horizontal opening. CFD simulation results show that temperature difference between the two rooms and ventilation rate strongly influence the interzonal mass airflows through the opening when the upper room is colder than the lower room, while warm convective air currents from the baseboard heater and from the moisture source placed in the lower room cause upward mass airflows when the upper room is warmer than the lower room. Finally, empirical relationships between the upward mass airflow and the temperature difference between the two rooms are developed.

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Author Information and Other Publications Notes
Vera, S.
  1. Evaluation of radiance's genBSDF capability to assess solar bidirectional properties of complex fenestration systems
  2. Interzonal air and moisture transport through large horizontal openings in a full-scale two-story test hut: Part 1 - Experimental study  
Fazio, P.
Paul Fazio, Professor of Building, Civil & Environmental Engineering, Concordia University, Montreal
  1. A limit state design (LSD) approach for comparing relative drying performance of wood-frame envelope systems with full-scale lab, A roadmap towards intelligent net zero- and positive-energy buildings,
  2. A new test method to determine the relative drying capacity of building envelope panels of various configurations
  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
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  21. Effect of capillarity on rainwater penetration in the building envelope
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  23. Essai sur les toits plats isol¨¦s ¨¤ la fibre de cellulose
  24. Evaluation of radiance's genBSDF capability to assess solar bidirectional properties of complex fenestration systems
  25. Experimental evaluation of potential transport of mold spores from moldy studs in full-size wall assemblies
  26. Experimental setup for the study of air leakage patterns
  27. Experimental study of temperature distributions across two curtain wall systems
  28. Folded sandwich plate structures
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Rao, J.
Department of Building, Civil, and Environmental Engineering, Concordia University, Montreal
  1. A limit state design (LSD) approach for comparing relative drying performance of wood-frame envelope systems with full-scale lab, A roadmap towards intelligent net zero- and positive-energy buildings,
  2. A new test method to determine the relative drying capacity of building envelope panels of various configurations
  3. A new testing method to evaluate the relative drying performance of different building envelope systems using water trays
  4. Building Physics: 3rd International Conference in Building Physics
  5. Building pressurisation can affect possibility of mould growth
  6. Comparaison de m¨¦thodes de mesure de flux de chaleur pour sp¨¦cimens de grandes et moyennes dimensions
  7. Design and construction of an environmental chamber facility
  8. Development of experimental procedure to evaluate potential movement of mold spores from wall cavity to indoor environment
  9. Development of HAM tool for building envelope analysis
  10. Effect of capillarity on rainwater penetration in the building envelope
  11. Environmental chamber for investigation of building envelope performance
  12. Evaluation of radiance's genBSDF capability to assess solar bidirectional properties of complex fenestration systems
  13. Experimental evaluation of potential transport of mold spores from moldy studs in full-size wall assemblies
  14. Experimental study of temperature distributions across two curtain wall systems
  15. Identification and transport investigation of microbial volatile organic compounds in full-scale stud cavities
  16. In-cavity evaporation allowance--A drying capacity indicator for wood-frame wall system
  17. Interzonal air and moisture transport through large horizontal openings in a full-scale two-story test hut: Part 1 - Experimental study
  18. Measuring air leakage characteristics with flexible double air chambers
  19. Measuring air leakage of full-scale curtain wall sections using a non-rigid air-chamber method
  20. Numerical investigation of the influence of room factors on HAM transport in a full-scale experimental room
  21. Review and framework for large-scale laboratory studies on wetting and drying of building envelopes
  22. Statistical analysis of microbial volatile organic compounds in an experimental project: identification and transport analysis
  23. Study of the reduced impact of thermal bridges in two sprayed-applied polyurethane wall assemblies
  24. Test method to measure the relative capacity of wall panels to evacuate moisture from their stud cavity
  25. Transfer of heat, moisture and air through metal curtain walls
  26. Use of an environmental chamber to investigate large-scale envelope specimen hygrothermal performance  



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