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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.
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  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
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  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
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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
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  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
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  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
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  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
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  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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