[Equest-users] equest and energy plus outputs

[Pasha Korber-Gonzalez]

As I understand it--Energy+ is free-ware in it's raw form.    I guess I was
wrong to make an assumption that Deepika is using it without an
interface.    If this is not the case it might explain such a variance in
results.     When I model in DOE-2 raw form---it is so much harder for me to
manage my data and inputs in my head and such----I was not born to be a
programmer, and it gives me nightmares from struggling to pass FORTRAN so
many years ago...ugh.

Therefore, I haven't looked at E+ myself for a very long time and purchasing
or putting out the cost for the user-interface programs is not as desireable
as using the eQuest free-ware.  or the future CANQuest free-ware (future SI
version).

BUT-- I know that E+ is supposed to have some great capabilities in which we
are limited with DOE-2 (to an extent.)    Has anyone else had the time and
desire to compare these program engines more closely recently?   Also--why
is it so difficult to "match" systems in eQuest and E+....forgive my
blase'-ness, but isn't a pkgd system a pkgd system...a pkgd system???  :)
Pasha


On Thu, Apr 28, 2011 at 11:39 AM, deepika khowal
<deepika.khowal at gmail.com>wrote:

> So based on my analysis, there is a difference of about 10% in results of
> equest and E+. I would believe that because there are certain parameters
> which are very difficult to match.
> this seems reasonable to me.
>
>
> On Thu, Apr 28, 2011 at 9:09 AM, John Aulbach <jra_sac at yahoo.com> wrote:
>
>>  I am sure EnergyPlus is a fine and well thought out program (consider
>> the sources and fine people involved).  However, since I am in production
>> mode (and don't have time to create a model in two different programs-who
>> pays for THAT), I chose to migrate to eQuest after DOE-2.1 A, B, C, D, and
>> E. There are plenty of resources to ask questions of, the program started
>> out in Windows (didn't need "add ons"), and gives me a 3-D rendering on the
>> building immediately.
>>
>> I dealt with 20 years of "raw" DOE-2, where I didn't know what my building
>> really looked like (until Joe Huang came along with BDL Draw..). So I would
>> need at age (you guess..) to not relearn an entirely new program and stick
>> with what I had learned over the past 25+ years.
>>
>>
>> John R. Aulbach, PE, CEM
>>
>> Senior Energy Engineer
>>  ------------------------------
>>
>> *Partner** **Energy*
>>
>> 1990 E. Grand Avenue, El Segundo, CA 90245
>> W: 888-826-1216, X254| D: 310-765-7295 | F: 310-817-2745
>>
>> www.ptrenergy.com | jaulbach at ptrenergy.com
>>
>>
>>
>>
>>  ------------------------------
>> *From:* deepika khowal <deepika.khowal at gmail.com>
>> *To:* Paul Diglio <paul.diglio at sbcglobal.net>
>> *Cc:* equest-users at lists.onebuilding.org; energyplus_support <
>> EnergyPlus_Support at yahoogroups.com>
>> *Sent:* Thu, April 28, 2011 8:56:34 AM
>>
>> *Subject:* 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 at sbcglobal.net>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 at gmail.com>
>>> *To:* deepika khowal <deepika.khowal at gmail.com>
>>> *Cc:* energyplus_support <EnergyPlus_Support at yahoogroups.com>;
>>> equest-users at lists.onebuilding.org
>>> *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,
>>> Pasha
>>>
>>> Korber Energy Consultants
>>>
>>>
>>>
>>> On Wed, Apr 27, 2011 at 7:11 PM, deepika khowal <
>>> deepika.khowal at gmail.com> 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 at whiteboxtechnologies.com> 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 at whiteboxtechnologies.com
>>>>> 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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>>>>>>
>>>>>
>>>>
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>>>
>>
>
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