Numerical analysis of displacement ventilation for different locations of the outlets

Le résumé fourni par la source

Abstract In the earlier phase of construction of simple buildings, natural ventilation was the best ventilation method used in those times. It was a simple system which includes windows, doors, chimneys etc. where forces like buoyancy force acts due to thermal and density variations of indoor and outdoor air. Later, due to increase in working population in offices, industries, natural ventilation failed to satisfy the comfort levels of the working people. A combination of mixing ventilation and natural ventilation introduced satisfying industries and large shopping outlets in both comfort levels and also improved air distribution quality guaranteeing the safety of people working by clearing out pollutants efficiently. But the shortcomings of this ventilation were such that the higher jet velocities causing loud noises, less efficiency causing pollutants concentration to rise in air, etc. Therefore, at places where noiseless, efficiency and moderate comfort is preferred displacement ventilation came in the present scenario. Displacement ventilation supplies cold air at low velocities from the floor level, while hot air rises to the ceiling due to buoyancy while hot air escapes through the exit outlets placed at proper positions to create a way for the circulation of fresh air. The displacement ventilation in an office model with different variations that depend on heat sources, outlet positions etc. is studied in the present study. Different cases have been simulated for the different locations of the outlet and number of heat sources.

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