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Re: [EnergyPlus_Support] Problem about CP values



Michele,

The site wind conditions are used to modify the wind speed hitting the 
building, but they do not change the CP values. The Plan Area Density was 
originally added  for use by the CpCalculation routine to calculate 
automatically the CP  but that routine has been deleted from COMIS quite a 
few years ago.  Consequently, the PAD input no has no effect on the 
computations.  EnergyPlus does have a  limited ability to calculate CPs for 
low-rise buildings based on an ASHRAE paper (choose  Wind Pressure 
Coefficients as SURFACE-AVERAGE CALCULATION), but that also does not modify 
the CP values as a function of local wind conditions.

Joe

----- Original Message ----- 
From: "Linda Lawrie" <linda@xxxxxxxxxx>
To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Wednesday, December 21, 2005 10:59 AM
Subject: Re: [EnergyPlus_Support] Problem about CP values


Yes, upload please.  We'll try to get the COMIS
expert to look at it, if warranted.

Linda

At 09:10 AM 12/21/2005, Michele Matos wrote:

>Hi Linda,
>
>I have already removed the "Report, ComisInput" statement from my input
>file, run the simulation and put the statement again, and run it again...
>The site wind conditions are updated in the .cif but the CP values did not.
>
>Any other suggestion.
>Should I upload the idf file to the group?
>
>   thanks,
>
>   Michele
>
>
>
>Linda Lawrie <linda@xxxxxxxxxx> escreveu:
>   Did you remove the "Report, ComisInput" statement from one run to the 
> next?
>
>The .cif file is only built once per run.  All the inputs are
>actually passed internally and the .cif file is only a snapshot.
>
>At 04:39 PM 12/15/2005, michelematos_ecv wrote:
>
> >I have a problem about the CP values (using COMIS air flow model).
> >When I change the model plan area density and expoent of wind velocity
> >profile, on COMIS SITE WIND CONDITIONS, the CP values in the *.cif
> >file are not updated...
> >Does anyone have the same problem? or I am missing something...
>
>Linda
>
>EnergyPlus WebSite: http://www.energyplus.gov
>Owner: EnergyPlus_Support list
>Member: EnergyPlus Development Team
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