Re: [EnergyPlus_Support] Re: [Equest-users] equest and energy plus outputs

On Thu, Apr 28, 2011 at 12:40 PM, Zhang Xiangjing <geshen516@xxxxxxxxx> wrote:

Hi khowal

I think 50% discrepancy is too high for two validated tools.
You can look through IEA tasks, there are more than two related to test and validation of building energy simulation tools.

Regards
ZHANG Xiangjing

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, deepika khowal <deepika.khowal@...> wrote:
>
> Thanks Joe
> Even I realized the same thing. the total energy use in Energy plus was
> almost 50% less than equest.
> If this is the case, who would you know that you model is working fine?
>
> On Wed, Apr 27, 2011 at 6:06 PM, Joe Huang <yjhuang@...

> > wrote:
>
> > I was involved in a two year project 2005-2007 to convert the Calif. Energy
> > Commission's Title-24 certification suite of building tests from DOE-2.1E to
> > EnergyPlus. There are some areas where it's difficult to get comparable
> > inputs due to differences or limitations in the models. The differences
> > between the two programs varied a lot depending on the building, weather,
> > and HVAC system. For the CEC certification suite of 160 runs, cooling
> > results were more consistent, within 10% in most cases, with EnergyPlus
> > almost always on the high side; for heating, the differences were much
> > greater, sometimes with EnergyPlus being 40-60% lower than DOE-2.1E. I have
> > a 120-page report on this comparison, but haven't bothered to put it on the
> > Web.
> >
> > Joe
> >
> > Joe Huang
> > White Box Technologies, Inc.
> > 346 Rheem Blvd., Suite 108D
> > Moraga CA 94556
> > yjhuang@...

> > www.whiteboxtechnologies.com
> > (o) (925)388-0265
> > (c) (510)928-2683
> > "building energy simulations at your fingertips"
> >
> >
> >
> > deepika khowal wrote:
> >
> >> HI All
> >> I am trying to create same model in equest and energy plus to see whether
> >> i see same results and just to validate my simulation files.
> >> has anyone done this before?
> >> I would like to know what is the % difference in both software outputs?
> >> Thanks
> >> Deepika
> >> ----------------------------------------------------------
> >>
> >>
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> >
>