Dispersion Analysis for VA Hospitals - with Dr. Kevin Linfield, P.E. скачать в хорошем качестве

Dispersion Analysis for VA Hospitals - with Dr. Kevin Linfield, P.E.

Dispersion Analysis for VA Hospitals A short video featuring Dr. Kevin Linfield. The US Department of Veteran Affairs Office of Construction and Facilities Management publishes the HVAC design manual that specifies that A/E firms shall perform an analysis using Computational Fluid Dynamics modeling or wind tunnel analysis to ensure that odors and hazardous exhausts do not enter into outdoor air intakes and open windows of VA facilities and adjoining properties. The guidelines refer to the ASHRAE Handbook of Fundamentals, specifically the chapter on Airflow Around Buildings. The modeling requirements specify that the analysis assess all wind directions that might pose a risk, different wind speeds, and at a range of exhaust velocities. Any contamination problems indicated by the simulation shall be corrected prior to proceeding with any additional design development. CFD modeling can analyze the plume behavior under a range of different ambient wind conditions and emission flow rates. A three-dimensional CFD model is constructed of the exterior of the buildings and the surrounding community, and exhaust gases emitted are tracked. Visualization of the gas dispersion using color contours and path lines superimposed on the geometry of the buildings communicate the flow patterns and gas concentration levels at key locations. Wind tunnels are also used for environmental flow testing around scale model of buildings. Shown here is a 100th scale model featuring a portion of downtown Detroit. This tunnel includes a 360-degree turntable to allow any incoming wind direction to be analyzed, along with appropriate spires and surface roughness generators to represent the Earth boundary layer for wind approaching the buildings. For more information on flow modeling and testing, please contact Airflow Sciences. Thank you, and have a wonderful day. Copyright Airflow Sciences Corporation. With contributions by Jeff Everett and Dr. Kevin Linfield, P.Eng., P.E.