Sunday, 26 June 2016: 1:30 PM-3:00 PM
Indoor Environment: Health, Comfort, Productivity
Chair:
Reza Ghias, Ph.D., Southland Industries
Technical Committee: 04.10 Indoor Environmental Modeling
The air distribution systems play an important role in thermal comfort and energy consumption in commercial and residential buildings. The flow rate, temperature and location of the supply air affect the thermal comfort, temperature stratification and particle transportation in a room. Owners and engineers are more encouraged to improve the indoor air quality (IAQ) as its impact on human performances and energy saving is getting more important for the companies. The speakers compare different types of the heating distribution systems and show how computational fluid dynamics (CFD) can address their design challenges and efficiencies.
1.00 Air Distribution and Ventilation Effectiveness with All-Air Heating Systems
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Atila Novoselac, Ph.D., The University of Texas at Austin |
The room air distribution in the occupied zone affects pollutant transport, temperature field, and draft risks. With all-air heating systems, buoyancy of a hot supply air from a celling diffuser often prevents proper air distribution in the room causing large temperature stratification and stagnant zones. This presentation shows velocity and temperature distribution in the room with all-air heating system, when considering different flow rates and supply air diffuser types. The study compares temperature stratification, air diffusion performance index (ADPI), and ventilation defectiveness (VE). It identifies types of diffusers and operation conditions that are suitable for all air-heating systems.
2.00 Using Stratified Air Systems for Heating Mode
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Mikhail Koupriyanov, P.Eng., Price Industries Limited |
Stratified air systems such as displacement ventilation and underfloor technologies have seen increased usage in North America in many types of installations. Both types of systems are driven by thermal buoyancy and are primarily used for cooling where they can potentially decrease energy consumption and improve indoor air quality. Although there is plenty of guidance on proper design of these systems for cooling their use in climates where heating is also required is not as straightforward. Design guidance is provided through project examples in several climate zones. CFD is used to assess the predicted performance of the presented design options.