Re: [EnergyPlus_Support] problems of unreasonable indoor temperature

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

This is a cube with a large south-facing window, massive walls/roof/floor, and 
infiltration only during daytime hours.  The thermal mass of the envelope is 
equivalent to approximately 0.5m of gypsum board.

If the surfaces are changed to a single layer of gypsum board, then nighttime 
temperatures approach the outdoor temperature, with warmer temperatures during 
the day when the sun is shining through the window.

With the massive constructions in the original input file, the temperatures of 

Also, you must be careful with the floor.  The values entered for "Ground 
Temperature" are the outside boundary condition  for the floor surface 
(OutsideFaceEnvironment=Ground).

Mike



On 23 Jul 2007 at 12:34, Qian Li wrote:

> Hi:
> 
> I am a beginner of Energy+ and I am doing some simple simulation of generating
> indoor temperature of a simple model (a cubic box and a south facing window). 
> 
> However, I met a very strange problem, the reported result was unreasonable
> high, the indoor temperature in winter is around 8 to 10 degree while the
> external temperature is about -5.  The model is without any internal gain, HVAC
> system and occupancy, there is no reason for the indoor temperature to be such
> high, I used the same setting of model and simulated in Ecotect and HTB2, the
> result of those two software match each other (if without and heat gain, the
> range of winter indoor temperature is -1 to 2). I did many attempts in modifying
> the model of energy plus but cannot identify any problem that causing this, it
> has been troubling me for many days.  Any response that can explain the possible
> cause of the problem will be very appreciated.
> 
> I had uploaded the model to the yahoo group (model name is `Single
> cell-2307.idf´, and also attached it with this e-mail.  The weather file used
> was downloaded from energy plus website (CHN_Beijing_CSWD.epw).
> 
> Many thanks , please let me know. 
> 
> 
> Qian Li
> Welsh school of architecture
> Cardiff University
> Uk
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
> 
> 
> 
> 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.pdf under the
> Documentation link 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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