The wind in a weather file is at 3 meters off the ground. Your wind tunnel data should be referenced to that model height. There will be some recalculation of
the wind speed for the site based on the terrain. Airports where the wind is measured are typically open areas while many buildings are in urban areas with lots of closer, obscuring objects. The AirflowNetwork will use the component WindPressureCoeficientValues
with the reported wind velocity in the weather file. So now the question is whether your wind tunnel testing included an appropriate terrain to develop a profile at your model surfaces. I have used a virtual wind tunnel without a profile and achieved good
results with a measured building.
Ned Lyon, P.E. (MA, WV)
Staff Consultant
SIMPSON GUMPERTZ & HEGER
781.907.9000 main
781.907.9350 direct
617.285.2162 mobile
781.907.9009 fax
www.sgh.com
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From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
Sent: Friday, October 14, 2016 6:43 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Wind Pressure Coefficients
Hi everybody,
I performed some wind tunnel tests and now I have to calculate the wind pressure coefficients based on the generated pressure data. However, I have a doubt about
the reference height used to calculate the wind speed (dynamic pressure). What is the reference height that I could use in this calculation?
I got through some literature references and some of them indicated the building height as an alternative. Is that the best choice?
I will simulate natural ventilation using Airflow Network group. So, I will input those data in AirflowNetwork:MultiZone: WindPressureCoefficientValues.
Thank you so much,
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Posted by: "Edward G. Lyon" <EGLyon@xxxxxxx>
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