[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [EnergyPlus_Support] Input of Infiltration coefficients

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Input of Infiltration coefficients
From: "Michael J. Witte" <mjwitte@xxxxxxxx>
Date: Mon, 18 Sep 2006 13:06:58 -0500
Comment: DomainKeys? See http://antispam.yahoo.com/domainkeys
Delivered-to: linda:lawrie.com@xxxxxxxxxxxxxxx
Delivered-to: mailing list EnergyPlus_Support@xxxxxxxxxxxxxxx
Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=lima; d=yahoogroups.com; b=td2i9yijcJhNmAc+eaINmco4fBw9uvNIdAma0q8dMegsCdvmEl/bsg1mNvafZHiiEXly7K1ddOQ7cw6XeiJhLpOG1veeHtbnhn46cMBofVGOpztgr+rTBUQUMySVH2V6;
In-reply-to: <eegqvo+msst@eGroups.com>
List-id: <EnergyPlus_Support.yahoogroups.com>
List-unsubscribe: <mailto:EnergyPlus_Support-unsubscribe@yahoogroups.com>
Mailing-list: list EnergyPlus_Support@xxxxxxxxxxxxxxx; contact EnergyPlus_Support-owner@xxxxxxxxxxxxxxx
Organization: GARD Analytics
Priority: normal
References: <4509B081.40309@lbl.gov>
Reply-to: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sender: EnergyPlus_Support@xxxxxxxxxxxxxxx

The preprocess approach will not work, because EnergyPlus reads the input once, 
then initializes the simulation and simulates and environment.  There no 
mechanism to stop the simulation, alter inputs, then proceed again.

The schedule problem still appears to be the only viable option other than 
getting a source code license and rewriting the INFILTRATION object.  To 
simplify entering this type of schedule see SCHEDULE:FILE:COMMA.

Mike


On 16 Sep 2006 at 12:34, natasamdj wrote:

> Dear,
> I think that you understood what I want to do. But I think that it 
> is not a good solution to input all these coefficients as schedule. 
> Considering that weather data change every day, it will imply the 
> new schedule for every day. I wondered if it is possible to make 
> some kind of pre-process from the table that I made, and then use 
> such data for different weather conditions. I am more interesting to 
> input that through some kind of pre-process, and then E+ will take 
> the new values for both C and D for the different weather 
> conditions. I would like to ask you if you can give me some kind of 
> short help (guideline) or document, where I can read how I can do it.
> 
> Thank you in advance!
> 
> Natasa M.Djuric
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, fred buhl <wfbuhl@...> 
> wrote:
> >
> > I'm not sure I understand what you are trying to do. It sounds as 
> if you 
> > wish to vary the
> > C and D infiltration coefficients (which are now fixed inputs) 
> during 
> > the simulation as a
> > function of outdoor weather conditions. That isn't currently 
> possible. 
> > Since the infiltration
> > rate can be scheduled, wouldn't a better approach be to use a 
> > spreadsheet to calculate from
> > the weather file and your table values of the infiltration flow 
> rate 
> > (m3/s) for each hour of
> > the simulation and input these via the schedule in the 
> infiltration 
> > object  (with of course
> > A=1, all other coeffs = 0).
> > 
> > natasamdj wrote:
> > 
> > >Dear,
> > >I would like to ask you how I can make inputs for some of the 
> > >parameters. I am going to explain what about I am wandering now. 
> I 
> > >have been comparing the real window properties with the 
> EnergyPlus 
> > >widow model. My aim is to calibrate or adjust the EnergyPlus 
> model 
> > >with the data that I can find or obtain. Actually I know the U 
> value 
> > >(from producer specification) for the real widow and then through 
> > >optimization in GenOpt I adjusted the conductivity of the window 
> in 
> > >EnergyPlus.
> > >The similar optimization I had repeated for the infiltration 
> > >coefficients C and D. C multiplies wind speed, while D multiplies 
> > >wind speed on square. These coefficients are from EnergyPlus 
> model 
> > >for the infiltration. I had been performing several optimizations 
> > >for different outdoor temperatures and wind speeds. Now I have 
> the 
> > >table with the different coefficients C and D, for different wind 
> > >speed and outdoor temperature.
> > >I think that the infiltration changes with the different outdoor 
> > >conditions. I would like to use that table as the input for the C 
> > >and D in the infiltration model. Actually, when EnergyPlus use 
> the 
> > >weather file, then regarding to the outdoor conditions (outdoor 
> > >temperature and wind speed), infiltration model has to choose the 
> > >value for both C and D from the table. 
> > >My question is: how to import for C and D data from the table? I 
> > >think that it is not difficult to make a program in MatLab for 
> > >example that chooses the value for the coefficients. I do not 
> know 
> > >how to connect all this in EnergyPlus. Can you give me some 
> > >guideline how to connect these files, Weather File, idf, the 
> table 
> > >with the coefficients, and a Mat file? I tried to find some 
> > >explanation in help, but I could not find. Also, if you think 
> that 
> > >it is better to import the data for the coefficients through some 
> > >another program you can suggest me.
> > >
> > >Thank you in advance!
> > >
> > >Natasa M.Djuric
> > >
> > >
> > >
> > >
> > >
> > >
> > >The primary EnergyPlus web site is found at:
> > >http://www.energyplus.gov
> > >
> > >The group web site is:
> > >http://groups.yahoo.com/group/EnergyPlus_Support/
> > >
> > >Attachments are not allowed -- please post any files to the 
> appropriate folder in the Files area of the Support Web Site.
> > >
> > >EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf 
> and press the "search" button.
> > > 
> > >Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
> > >
> > > 
> > >
> > >
> > >  
> > >
> >
> 
> 
> 
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf and press the
> "search" button.
>  
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 


========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf and press the "search" button.
 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/join
    (Yahoo! ID required)

<*> To change settings via email:
    mailto:EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    mailto:EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/

References:
- Re: [EnergyPlus_Support] Input of Infiltration coefficients
  - From: fred buhl
- [EnergyPlus_Support] Input of Infiltration coefficients
  - From: natasamdj

Prev by Date: Re: [EnergyPlus_Support] connected surface warning and CSV File schedule
Next by Date: Re: [EnergyPlus_Support] Energy stored in zone air
Previous by thread: Re: [EnergyPlus_Support] Energy stored in zone air
Next by thread: RE: [EnergyPlus_Support] Water film on a building wall
Index(es):
- Date
- Thread