[Equest-users] Accuracy of eQUEST

Sat May 8 22:42:56 PDT 2021

To help refine the original prompt:  This is a little bit like asking "is a ball-peen hammer an accurate choice for hitting a nail?"

In the hands of a skilled craftsman, this hammer option presents as an excellent choice for many situations. In the hands of someone still learning the trade, using this hammer will result in sub-optimal outcomes over other purpose-built options and of course any hammer will inevitably miss the nail sometimes based on user error.  It may be tempting to blame the hammer, but there's the old adage "a good craftsman never blames his tools."

Rounding back, eQuest/doe2 is one of many platforms that can do most things very well (depending on the skill/experience of the wielder).  It does have shortcomings in specific circumstances over alternatives, but then like any craftsman I prefer to wear more than one tool on my belt to cover different challenges ;-).

~Nick
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From: Equest-users <equest-users-bounces at lists.onebuilding.org> on behalf of jra_sac via Equest-users <equest-users at lists.onebuilding.org>
Sent: Sunday, May 9, 2021 6:31:38 AM
To: Fred Betz <fbetz at aeieng.com>; equest-users at lists.onebuilding.org <equest-users at lists.onebuilding.org>; Saroj Lamichhane <213saroj at gmail.com>
Subject: Re: [Equest-users] Accuracy of eQUEST

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Good points, Fred. I still do not understand the fist of the question !@

Sent from my T-Mobile 4G LTE Device

-------- Original message --------
From: Fred Betz <fbetz at aeieng.com>
Date: 5/8/21 2:23 PM (GMT-08:00)
To: John Aulbach <jra_sac at yahoo.com>, equest-users at lists.onebuilding.org, Saroj Lamichhane <213saroj at gmail.com>
Subject: RE: [Equest-users] Accuracy of eQUEST

Garbage in, garbage out.

If the model inputs accurately reflect what’s is really happening, then yes it’s fairly accurate. Which is true for a lot of modeling tools.

Things like weather, schedules (occupancy, lights, equipment, etc.) can frequently be very different than reality, which can lead to a pretty wide range of results.

If you only want to use default inputs and typical weather and compare that to a real building data, then be prepared to have a 50% difference or more from what’s measured.

Hope that helps.

Fred

Fred Betz, PhD, LEED® AP BD+C

Building Performance
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From: John Aulbach <jra_sac at yahoo.com>
Sent: Saturday, May 8, 2021 12:30 PM
To: equest-users at lists.onebuilding.org; Saroj Lamichhane <213saroj at gmail.com>
Subject: Re: [Equest-users] Accuracy of eQUEST

Hello:

Not sure about the question you are asking.

DOE-2 (the engine of eQuest) has been around since the late 1970s. I know the creators and researchers have done countless benchmarking simulations against existing buildings to make the program viable. I myself have done runs against buildings with sub metering and the tracking has always been excellent.

Also, when I have run EEMs against a Base model, and had those modifications M&V'd later, they always seem to match.

So I think there should not be a worry of the accuracy of eQuest/DOE-2.

John R. Aulbach, PE

On Friday, May 7, 2021, 07:58:33 PM PDT, Saroj Lamichhane via Equest-users <equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>> wrote:

Hello everyone,

Does anybody have information about the effective modeling capability (Accuracy) of eQUEST with respect to the building parameters? Have a nice weekend!

Thank you!

Saroj Lamichhane

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