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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.