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<DIV>The data in the newly released NOAA/NCEP/CFSR dataset (which we have built
an interface to) for wind speed is the 2 minute average of the wind in the
previous hour for that 35-km grid at 10 meters. This is not an average for
the last hour, but is less noisy than the peak readings and it is available
hourly for a full 32 years. </DIV>
<DIV> </DIV>
<DIV>Chuck</DIV>
<DIV> </DIV>
<DIV
style="FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: 12pt">_____________________<BR>Chuck
Khuen<BR>Principal<BR>Weather Analytics
Inc.<BR>www.weatheranalytics.com<BR>781-856-5383</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=jhaberl@tamu.edu
href="mailto:jhaberl@tamu.edu">Jeff Haberl</A> </DIV>
<DIV><B>Sent:</B> Saturday, June 11, 2011 9:20 PM</DIV>
<DIV><B>To:</B> <A title=paul@zed-uk.com href="mailto:paul@zed-uk.com">Paul
Carey</A> ; <A title=l.f.r.peeters@gmail.com
href="mailto:l.f.r.peeters@gmail.com">leen peeters</A> ; <A
title=bldg-sim@lists.onebuilding.org
href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</A>
</DIV>
<DIV><B>Subject:</B> Re: [Bldg-sim] wind speed in TMY</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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<P>Hello,</P>
<P> </P>
<P>Unfortunately, historical wind speeds on TMY files that come from NOAA data
are from peak 5 minute gusts, which can have little correlation to average
hourly wind speeds. At some stations integrating sensors have been added, but it
will take time to push these data through the average year data base.</P>
<P> </P>
<P>In addition, previous work in England using ultrasonic sensors has shown that
NOAA data also suffers from severe drop out at speeds less than 5 to 10 MPH,
which means that most sites show "0" wind speed, whereas there is actually some
wind, but not enough to move the cups on the anemometer. This can be a problem
for simulation of natural ventilation.</P>
<P> </P>
<P>ASHRAE's TC 4.2 continues to discussed these and other issues, which can be
viewed on ASHRAE web page in their meeting minutes.</P>
<P> </P>
<P>Jeff</P>
<DIV>
<P> </P>
<DIV><FONT color=#0000ff size=2 face=Tahoma>8=! 8=) :=)
8=) ;=) 8=) 8=( 8=) 8=() 8=) 8=|
8=) :=') 8=)8=?<BR><BR>Jeff S. Haberl, Ph.D.,P.E.,
FASHRAE..............jhaberl@tamu.edu<BR><BR>Professor............................................................Office
Ph: 979-845-6507<BR><BR>Department of
Architecture.............................Lab Ph:979-845-6065<BR><BR>Energy
Systems Laboratory.............................FAX: 979-862-2457<BR><BR>Texas
A&M University.....................................77843-3581<BR><BR>College
Station, Texas, USA,
77843..................URL:www.esl.tamu.edu<BR><BR>8=/ 8=) :=)
8=) ;=) 8=) 8=() 8=) :=) 8=) 8=!
8=) 8=? 8=)8=0<BR></FONT></DIV></DIV>
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<DIV style="DIRECTION: ltr" id=divRpF996061><FONT color=#000000 size=2
face=Tahoma><B>From:</B> bldg-sim-bounces@lists.onebuilding.org
[bldg-sim-bounces@lists.onebuilding.org] on behalf of Paul Carey
[paul@zed-uk.com]<BR><B>Sent:</B> Saturday, June 11, 2011 4:16 PM<BR><B>To:</B>
leen peeters; bldg-sim@lists.onebuilding.org<BR><B>Subject:</B> Re: [Bldg-sim]
wind speed in TMY<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>Dear Leen<BR><BR>Most weather data quotes the reference wind speed which is
that at 10m above the ground as measured at certain weather stations. Adjustment
factors are then made for levels of surface roughness, I.e. urban, rural
environments. I think the TMY follows the same
convention.<BR><BR>Paul<BR><BR><BR>Sent from my HTC<BR><BR>Dr Paul
Carey<BR>Director<BR><BR>Zero Energy Design Ltd<BR>10a Portland Place<BR>2-22
Mottram Road<BR>Stalybridge<BR>Cheshire<BR>UK<BR>SK15 3AD<BR><BR>Tel - +44 161
3386200<BR>Mob - +44 789 4098012<BR>Email - paul@zed-uk.com<BR><BR><BR><BR>-----
Reply message -----<BR>From: "leen peeters"
<l.f.r.peeters@gmail.com><BR>Date: Sat, Jun 11, 2011 20:34<BR>Subject:
[Bldg-sim] wind speed in TMY<BR>To:
<bldg-sim@lists.onebuilding.org><BR><BR>Hi,<BR><BR>can anyone tell me what
wind speed is exactly meant in the TMY. Is it the<BR>free, undisturbed wind
speed, the wind speed above the roof, the wind speed<BR>at 10 metres above the
ground ....<BR><BR>Thanks,<BR><BR>Leen<BR><BR><BR></DIV></DIV></DIV>
<P>
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