[EnergyPlus_Support] Re: DOE-2 and EnergyPlus calculated different cooling loads for the same buildin

["tjutw" <tjutw@xxxxxxxxx>]

Firstly, I am not from E+ development team.

I have also tried to compare the heating/cooling load from E+ and
Doe2.1E. Please see the following link:
http://tech.groups.yahoo.com/group/EnergyPlus_Support/message/9259
As Mike said, DOE-2.1e cooling results tend to be significantly higher
than EnergyPlus.
You can download the paper from E+ development team,
http://www.eere.energy.gov/buildings/energyplus/pdfs/energyplus_ashrae_140_envel\
ope.pdf
On the Page 36 and 32, cooling loads from E+ are usually lower than
those from Doe2.

In my opinion, at least window are one factor that leads to the
differences of cooling load.

I hope it helps.

Tj Ywh



--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Simge Andolsun
<simgeandolsun@...> wrote:
>
> Please find the attached EnergyPlus(1) and DOE-2(2) files. These two
files are supposed to be the DOE-2 and EnergyPlus simulations of the
same building. Thus, they are supposed to exhibit the same cooling
energy consumptions. The cooling energy consumptions, however, differ.
Please find the attached line graph (3) that shows the cooling energy
consumption of the building with respect to EnergyPlus and DOE-2
simulations on the peak cooling day (3rd of July). The DOE-2 output
exhibited twice of EneryPlus results. Please also find the attached
line graphs (4) that show the temperature fluctuations in the interior
zones of DOE-2 and EnergyPlus spaces. When compared to EnergyPlus
simulation, there was a time-lag in the temperature fluctuations of
the DOE-2 interior space. This made us consider FLOOR-WEIGHT factor in
DOE-2 as a probable reason. We tried different floor-weight values.
This however did not help much. Moreover, the cooling energy graphs
(3) showed a very similar
>  behavior although the values were very different. This suggested
that there might be a single definite reason for the difference in
cooling loads calculated by the two programs. With your experience on
EnergyPlus, which input would you recommend us to check as the
probable reason for the difference in results?
>    
>   Thanks in advance for your reply,
>   ps: If I should upload the attached files, please let me know.
>    
>   Simge Andolsun 
>   Graduate Research Assistant
>   Texas A&M University
>   Energy Systems Laboratory
> 
>        
> ---------------------------------
> Never miss a thing.   Make Yahoo your homepage.
> 
> [Non-text portions of this message have been removed]
>




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