[bldg-sim] wind speed data in TMY2 files

[Jeff Haberl]

I believe these are derived from NWS measurements, which tend to be 10 meter towers. However, the problem with NWS wind data is that it represents an average of a 3-5 minute snapshot taken 15 minutes before the hour, and thus seriously overstates the integrated average wind speed taken over the whole hour. 

Also, until quite recently,  these were taken with contact anemometers that cut-out below 3-5 MPH, which understates the amount of wind at low wind speeds. 

Jeff
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Jeff S. Haberl, Ph.D., P.E.............................jhaberl at esl.tamu.edu

Professor......................................................Office Ph: 979-845-6507

Department of Architecture.......................Lab Ph: 979-845-6065 

Energy Systems Laboratory.......................FAX: 979-862-2457 

Texas A&M University..............................77843-3581

College Station, Texas, USA.......................URL: www-esl.tamu.edu

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-----Original Message-----
From: bldg-sim at gard.com <bldg-sim at gard.com>
To: bldg-sim at gard.com <bldg-sim at gard.com>
Sent: Sat Sep 17 07:45:10 2005
Subject: [bldg-sim] wind speed data in TMY2 files

Does anybody know at what height the TMY2 wind speed data was measured?



Andy Lau, Associate Director, Center for Sustainability, Penn State
213-F Hammond Building, University Park, PA 16802
814-863-9075, 814-863-7229 (FAX), andylau at psu.edu, www.engr.psu.edu/cfs 


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