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Re: [EnergyPlus_Support] Re: temperature gradient
hi Lixing
I wanted to make a simple calculation to see if get
the same results in Energyplus.
As I said the measurements were made with specific
intervals. I found the areas of these intervals and
multiplied by measured velocities. I found the total
by adding all these. At last I divided this value to
total area in order to get mean velocity.
When I multiply mean velocity with window open area I
get volume flow rate. Is it wrong?
--- Lixing Gu <gu@xxxxxxxxxxxx> wrote:
> Neslihan:
>
> My answers are below your questions.
>
> ----- Original Message -----
> From: "neslihanturkmenoglu"
> <neslihanturkmenoglu@xxxxxxxxx>
> To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
> Sent: Wednesday, April 16, 2008 6:23 AM
> Subject: [EnergyPlus_Support] Re: temperature
> gradient
>
>
> > 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.
> >
> Your observation is correct. The wind speed
> calculation in the airflow
> network model is independent of inputs of weather
> station object and has its
> own inputs.
>
> > 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?
> >
> The field of Wind velocity profile exponent in the
> AIRFLOWNETWORK SIMULATION
> object and the field of Exponent of Wind Velocity
> Profile in the
> AIRFLOWNETWORK:MULTIZONE:SITE WIND CONDITIONS object
> are used for wind speed
> calculation. Could you let me know which is the
> third one specifically?
>
> > 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?
> >
>
> What is your definition of manual calculation
> results? If you compare your
> testing results, you have to ensure the input values
> used in the EnergyPlus
> match your testing conditions. I have no knowledge
> of convertion from wind
> tunnel conditions to EnergyPlus inputs.
>
> > 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.
> >
> When you got the calaculated wind velocity using the
> scale model, the
> velocity used in weather data should be at the
> height consistent with the
> input value of Reference height for recorded wind
> data in the AIRFLOWNETWORK
> SIMULATION object.
>
> > I hope you answer in a short time.
> > thank you very much
> >
>
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