[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: [EnergyPlus_Support] Re: Site:WeatherStation profiles.
I depends if your z values for the model geometry are relative to the roof of the 6 story building or to the ground. The weather station is really at a height of 2 m plus 6 stories.
It sounds like you may want to just turn off the profile model so the model uses the direct values from the weather station. In the Site:HeightVariation object, set the fields called Wind Speed Profile Boundary Layer Thickness and Air Temperature Gradient Coefficient to zero.
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of joselecastro
Sent: Friday, April 19, 2013 1:11 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Site:WeatherStation profiles.
But standard conditions are:
- Air temperature is measured at 1.5m
- Wind speed is measured at 10m above ground
- Weather station is in a flat, open field with little protection form the wind.
If I do not include Site:WeatherStation, Energy Plus will understand that the wind speed is at 10m when in fact it is at 2m, and that weather station is in open field with little protection when it is in the city and a bit protected.
And for the moment I use the the default exponent and boundary layer thickness for city.
--- In <mailto:EnergyPlus_Support%40yahoogroups.com>EnergyPlus_Support@xxxxxxxxxxxxxxx, Joe Huang <<mailto:YJHuang@...>YJHuang@...> wrote:
>
> 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
__._,_.___
Primary EnergyPlus support is found at:
<http://energyplus.helpserve.com>http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
The primary EnergyPlus web site is found at:
<http://www.energyplus.gov>http://www.energyplus.gov
The group web site is:
<http://groups.yahoo.com/group/EnergyPlus_Support/>http://groups.yahoo.com/group/EnergyPlus_Support/
Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
<http://geo.yahoo.com/serv?s=97476590/grpId=3387488/grpspId=1705007389/msgId=28817/stime=1366387015>
Your email settings: Individual Email|Traditional
<http://groups.yahoo.com/group/EnergyPlus_Support/join;_ylc=X3oDMTJmdTdtaWpyBF9TAzk3NDc2NTkwBGdycElkAzMzODc0ODgEZ3Jwc3BJZAMxNzA1MDA3Mzg5BHNlYwNmdHIEc2xrA3N0bmdzBHN0aW1lAzEzNjYzODcwMTU->Change settings via the Web (Yahoo! ID required)
Change settings via email: <mailto:EnergyPlus_Support-digest@xxxxxxxxxxxxxxx?subject=Email Delivery: Digest>Switch delivery to Daily Digest | Switch to Fully Featured
<http://groups.yahoo.com/group/EnergyPlus_Support;_ylc=X3oDMTJkc3RrYmprBF9TAzk3NDc2NTkwBGdycElkAzMzODc0ODgEZ3Jwc3BJZAMxNzA1MDA3Mzg5BHNlYwNmdHIEc2xrA2hwZgRzdGltZQMxMzY2Mzg3MDE1>Visit Your Group | <http://docs.yahoo.com/info/terms/> Yahoo! Groups Terms of Use | <mailto:EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx?subject=Unsubscribe> Unsubscribe
__,_._,___