Re: [EnergyPlus_Support] Simple Transient Model

["Michael J. Witte" <mjwitte@xxxxxxxx>]

It is hard to say what the problem may be.  Did you zero out all of the solar 
in the weather file, or set all of the surfaces to "NoSun"?

A similar test is reported in "EnergyPlus Testing with ASHRAE 1052-RP Toolkit - 
Building Fabric Analytical Tests".  Perhaps comparing your test inputs and 
results with tests TC1-TC3 will help you find the problem.  This report is 
available at:

http://www.eere.energy.gov/buildings/energyplus/testing.html

Follow the link for "ASHRAE Research Project 1052"

Mike


On 2 Dec 2006 at 17:49, elizabeth.ricker wrote:

> Hi All,
>    I am currently looking at a simple transient model in 
> EnergyPlus.  I would like to heat a room (1 zone) to 26C for a 
> period, then allow it to cool to the outdoor temperature (0C) and 
> analyze the time response of the system.  I am looking at the 
> reponse given that heat is only leaving through one wall, there is 
> no thermal mass in that wall, and the remainder of the walls are 
> super insulating.  The convection coefficients on each wall are set 
> to 1 W/m2K and the conductivity of the  single conducting wall is 
> very high (k = 1000, L = .1).  Given these conditions the only 
> thermal mass in my model should be that of the air in the room. 
> Also, I am running a modified weather file with T = 26C for the 
> first month, and then going to 0C for the remainder of the year. The 
> results that I am showing are presenting a much longer time reponse 
> than I would expect, and do not necessarily show an exponential time 
> decay.  Any suggestions on what might be going wrong in my model?  
> 
> Thank you,
> 
> Betsy Ricker
> 
> 
> 
> 
> 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





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