[EnergyPlus_Support] Re: temperature gradient

["neslihanturkmenoglu" <neslihanturkmenoglu@xxxxxxxxx>]

Hi Lixing


I calculated wind speed profile exponent with the values  got from 
wind tunnel measurements in front of the scale model. 
In order to understand,  I change the values one by one in weather 
station object or site atmospheric variation object, nothing changed 
in the results of airflow volume flow rate 2 to 1.
The only change occured when I enter my wind speed profile exponent 
to airflow network-site wind conditions object. 

I understood that one exponent is for weather site conditions,
the other exponent is for building site conditions.Why is there the 
third one with another default value in airflow network site wind 
conditions? 

when I compare the results of energyplus with my manually calculated 
volume flow rates, they are not the same. So in order to define the 
wind tunnel conditions in Energyplus, what do you suggest me to do?

And which velocity should I enter to design object wind velocity 
field- u mean calculated from measured data in front of the scale 
model or the wind tunnel's 2.5 m/s Gradient velocity %10 Motor 
velocity.

I hope you answer in a short time.
thank you very much









--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Lixing Gu <gu@...> wrote:
>
> Neslihan:
> 
> You may use the scale model to get the real size wind profile from 
the wind 
> tunnel testing data.
> 
> I think you may use the default value for tempeature gradient 
coefficient. I 
> could not find any fields to address velocity gradient. Please 
provide 
> specific information. For inputs of the WEATHER STATION object, you 
may use 
> the real size wind profile to generate input values of both fields 
of Wind 
> Sensor Height Above Groundand Wind Speed Profile Exponent.
> 
> Best regards,
> 
> Lixing
> ----- Original Message ----- 
> From: "neslihanturkmenoglu" <neslihanturkmenoglu@...>
> To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
> Sent: Thursday, April 10, 2008 9:20 AM
> Subject: [EnergyPlus_Support] temperature gradient
> 
> 
> > hi Lixing
> >
> > thank you very much for your answer.  Sorry for disturbing you too
> > much:)But I am in trouble as I try to learn building aerodynamics,
> > energyplus and others at the same time:)
> > Now I have another question.
> > I have velocites measured to a height of 35cm with an interval of 
1cm
> > on wind tunnel in front of the model.
> > I want to use these as reference velocities. I think I have to 
fill the
> > weather station and site atmospheric variation. I don't have data 
of
> > air temperature gradient.
> > So will I write 0 to air temperature gradient coefficient field?
> > How will I enter my own velocity gradient?
> > thank you
> >
> >
> > ------------------------------------
> >
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> >
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> >
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appropriate 
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> >
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under the 
> > Documentation link and press the "search" button.
> > Yahoo! Groups Links
> >
> >
> >
> >
>



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