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

As Joe and others mentioned, its really difficult to create all parameters same in both softwares.
I am still working on it .
For ex, which system should I use in equest as equivalent to unitary system in E+?
I understand its difficult to match every input and hence, getting same results is very tricky.
Thanks all for their inputs

On Thu, Apr 28, 2011 at 4:54 AM, Paul Diglio <paul.diglio@xxxxxxxxxxxxx> wrote:
I thought E+ is a free program?  I would be interested to hear from anyone who has used Google SketchUp and the Open Studio Plug-in to generate a 3D view in E+.

I would like to hear more about the discrepancies between eQuest and E+ from those who use both programs.

Paul Diglio

From: Pasha Korber-Gonzalez <pasha.pkconsulting@xxxxxxxxxx>
To: deepika khowal <deepika.khowal@xxxxxxxxx>
Cc: energyplus_support <EnergyPlus_Support@xxxxxxxxxxxxxxx>; equest-users@xxxxxxxxxxxxxxxxxxxxx
Sent: Thu, April 28, 2011 1:27:44 AM
Subject: Re: [Equest-users] equest and energy plus outputs

Hmmm- an energy plus model showed 50% less energy use (EUI) than eQuest?   Did you use the same weather files?  (i.e. convert the EPW you used in E+ to .bin and use the same weather file in eQuest?)
If this is truly the case, this is unsettling as a simulator.   Wouldn't it be safer for our clients to error on the conservative side and give the eQuest results instead of the E+ results?
Also--if this is the case, then what is the market advantage to spending thousands of dollars on E+ software rather than use the FREE-ware eQuest program??
I'd appreciate any commentary to help me "see the light" of this topic.  And if Deepika is willing to share a visual of his energy results output, I'm super curious to see what it is showing...
Good question/good info...thanks,
Korber Energy Consultants

On Wed, Apr 27, 2011 at 7:11 PM, deepika khowal <deepika.khowal@xxxxxxxxx> 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@xxxxxxxxxxxxxxxxxxxxxxxx> 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 Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
(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?

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