Computational Fluid Dynamics (CFD) Analysis of Displacement Ventilation

Displacement ventilation systems supply cold air at a low velocity near the floor, which then displaces the room air and airborne contaminants upward due to thermal buoyancy. Displacement ventilation can provide better indoor air quality with enhanced ventilation effectiveness compared to the traditional overhead mixing systems. In the case of displacement ventilation systems, the higher supply air temperatures combined with the low supply airflow rates help in achieving higher energy efficiency.

However, the size and locations of displacement diffusers and the strength, location, and type of sensible heat loads can affect the performance of displacement ventilation systems. The potential risks of unsatisfying occupant comfort and poor airflow distribution in the design of displacement ventilation systems can be realized only after commissioning and occupancy.

Our proprietary CFD analysis procedures help in the early detection and mitigation of such risks and suggest appropriate mitigation strategies at the concept level. We help our clients optimize the performance of the displacement ventilation system.

AnSights into Displacement Ventilation

A comparison of temperature distribution between overhead mixing and displacement ventilation

Air temperature distribution in a patient room with displacement ventilation

Airflow patterns in a patient room with displacement ventilation.

Flow path of airborne contaminants in a patient room with displacement ventilation

We provide insights into

Three-dimensional airflow patterns
Location and size optimization of supply and return diffusers.
Thermal stratification in the space.
Location optimization of the stratified layer to maximize thermal comfort.
Thermal comfort of occupants (ASHRAE Standard 55).
Three-dimensional distribution of temperature.
Contaminant displacement analysis

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Displacement Ventilation

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