Re: [EnergyPlus_Support] Comparison loads of E+ and Doe2.1E due to windows

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

Yes, DOE-2.1e cooling results tend to be sigificantly higher than EnergyPlus. 
Please see the bar charts in the following testing report to see some 
comparisons of different programs, including EnergyPlus and DOE-2.1E:

EnergyPlus Testing with Building Thermal Envelope and Fabric Load Tests from 
ANSI/ASHRAE Standard 140-2004

http://www.eere.energy.gov/buildings/energyplus/pdfs/energyplus_ashrae_140_envel
ope.pdf


Mike


On 29 Oct 2007 at 18:36, tjutw wrote:

> Hi All,
> 
> In my project, I used DOE2.1e and EnergyPlus to get simulation
> results. I found that heating energy is almost same. But the cooling
> energy are quite different.  It seems the main reason is  because of
> windows. It is hard to have the same parameters for windows in doe2.1e
> and EnergyPlus. So I created a very simple model to compare
> heating/cooling loads due to windows.
> 
> There are no internal heat (people, equipment, lighting) and no
> infiltration in space. The indoor temperature is taken as 22.2 degree
> C. The window is single panel without frame. From DOE2.1E,
> GLASS-TYPE-CODE is 1000 (U-SI 6.31, SHGC 0.86, SC 1, Tsol 0.84, Rfsol
> 0.08, Tvis 0.9, Rfvis 0.08, thickness 3mm).  Then I entered these
> parameters to EnergyPlus input file.  
> 
> The following are results.
> 
> zone without window (loads due to wall): 
> heating : 20.23 GJ (E+), 21.04 GJ (Doe2)  
> sens cooling: 0.07 GJ (E+), 0.28 GJ (Doe2)
> 
> zone with window (window-to-wall ratio is 16%)
> heating : 44.53 GJ (E+), 51.4 GJ (Doe2)
> sens cooling: 25.55 GJ (E+), 33.27 GJ (Doe2)
> 
> zone with window (window-to-wall ratio is 97%)
> heating: 210.68 GJ (E+), 228.2 GJ (Doe2)
> sens cooling: 143.72 GJ (E+), 223.76 GJ (Doe2)
> 
> From the above results, there are obvious differences in sensible
> cooling load.  I am not sure the differences are because of the
> different calculation methods of two software or I made some mistakes
>  in my simulation.  
> 
> Anyone can give me some advice about this?
> Thanks a lot in advance. 
> 
> Tj Ywh
> 
> 
> 
> 
> 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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The group web site is:
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Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.

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