The only purpose of the wind profile exponent is to adjust the wind speeds to that at the actual building site. If you have a weather station right at the site and are using those measured wind speeds, I don't see the benefit of making any adjustments, unless there's a significant difference in height between your weather station and model building. Lastly, keep in mind that these exponential wind profiles are gross generalizations of typical conditions. For a specific site, especially one in an urban setting as yours, it may not apply at all for a small height difference as 2 m.
Please excuse me if I'm misunderstood what you're trying to do.
Joe
Joe Huang White Box Technologies, Inc. 346 Rheem Blvd., Suite 108D Moraga CA 94556 yjhuang@xxxxxxxxxxxxxxxxxxxxxxxx www.whiteboxtechnologies.com (o) (925)388-0265 (c) (510)928-2683 "building energy simulations at your fingertips"
On 4/17/2013 9:28 PM, joselecastro wrote:
Thank you for your reply Joe.
Yes, with city or urban exponent and boundary layer thickness I got similar results, I think not with open country but it is not the case.
Like my weather station is 2m height in the city I may use Site:WeatherStation, because standard conditions are wind speed is measured at 10m and in a flat open field with little protection from the wind.
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Joe Huang <YJHuang@...> wrote:
>
> If you are using the wind speeds from your weather station that's nearby and has the same
> elevation, the wind speed profile exponent and boundary layer thickness have no effect,
> although you could still input them if you want. These only come into effect when the
> elevation of your site differs substantially from that of the weather station.
>
> Joe
>
> Joe Huang
> White Box Technologies, Inc.
> 346 Rheem Blvd., Suite 108D
> Moraga CA 94556
> yjhuang@...
> www.whiteboxtechnologies.com
> (o) (925)388-0265
> (c) (510)928-2683
> "building energy simulations at your fingertips"
>
>
> On 4/16/2013 10:12 PM, joselecastro wrote:
> >
> > Hi All,
> >
> > I built a small scale building on the roof of a six story building. My weather station
> > is located near the small scale building. I need to use Site:WeatherStation to compare
> > simulations and measurements.
> >
> > Like it is located in the city, should I use 0.33 as wind speed profile exponent and 460
> > as wind speed profile boundary layer thickness ?
> >
> > Does anyone have experience using a weather station and simulating?
> >
> > Thank you very much,
> > Jose
> >
> >
>
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