[Equest-users] Electricity consumption mismatch between model and bill

Sun Oct 27 11:05:05 PDT 2019

Hello Sharad:

equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>; equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>

Welcome to the world of whole-building energy simulation. Unfortunately, getting a simulation to match the utility bills for a specific building can be a challenge. There's a good review of the many methods that have been developed over the years in Coakley et al.

https://www.sciencedirect.com/science/article/abs/pii/S1364032114003232

In general, you need to have a process that "matches" those measurements that you can match, and then "calibrate" the rest to get the best match of the whole-building simulation. One of the earliest papers that provided a systematic method was Hsieh et al., which described the process for an office building in New Jersey.

https://www.sciencedirect.com/science/article/abs/pii/0378778894900051

More recently, newer methods have been proposed that begin to consider inputs that were previously assumed. For example, indoor temperatures when considering motion sensors on thermostats, for  example Kim and Oldham's paper on modeling occupancy-based controls in hotels

http://scholar.google.com/scholar_url?url=https%3A%2F%2Foaktrust.library.tamu.edu%2Fhandle%2F1969.1%2F88028&hl=en&sa=T&ct=res&cd=2&d=2178238779268168983&ei=ZNq1XeGYIojYygSsz7KwDA&scisig=AAGBfm2IHuKrSyMK8rYGTWiIi3U9iZUNCQ&nossl=1&ws=1280x595&at=Review%20and%20Recommendations%20of%20Existing%20Methods%20and%20Tools%20for%20Building%20Energy%20Analysis%3A%20Subtask%202.4%20for%20the%20Southern%20Energy%20Efficiency%20Center&bn=1

Or, Shin et al's paper on modeling occupancy-based controls in a net zero building at Ft. Hood.

http://www.ibpsa.org/proceedings/BS2017/BS2017_346.pdf

And of course there are the classic papers, including Bronson et al.

https://www.osti.gov/biblio/6885248

Or even Bou Saada et al's work

https://asmedigitalcollection.asme.org/solarenergyengineering/article-abstract/120/3/193/435764

Hopefully,  these will give you a sense of how to proceed.

Jeff

Graphical tools to help calibrate the DOE-2 simulation program (Journal Article) | OSTI.GOV<https://www.osti.gov/biblio/6885248>
www.osti.gov
The U.S. Department of Energy's Office of Scientific and Technical Information

Jeff S. Haberl, Ph.D., P.E.inactive, FASHRAE,FIBPSA

Department of Architecture

Texas A&M University

College Station, TX 77845-3581

Office: 979-845-6507, Lab: 979-845-6065

Fax 979-862-2457

jhaberl at tamu.edu,www.esl.tamu.edu<mailto:jhaberl at tamu.edu,www.esl.tamu.edu>

________________________________
From: Equest-users <equest-users-bounces at lists.onebuilding.org> on behalf of Sharad Kumar via Equest-users <equest-users at lists.onebuilding.org>
Sent: Saturday, October 26, 2019 10:50 PM
To: equest-users
Subject: Re: [Equest-users] Electricity consumption mismatch between model and bill

Hi Inga,

As per my understanding the correction that i can suggest is the correction in schedules.
The electrical consumption that you are inferring in the eQUEST as 330 MWh and the actual bills are 73 MWh.
Now you are as a suggestion is required to fetch the actual working hour of the type wise hourly use of the segments.
There can be minor or major mismatch in the hourly usage which sometime can have slight or above mismatch.
Kindly get the hourly usage data from the electrical consultant and if seen do the correction in  the schedules.
This is the only correction that i am able to think right now.
Hope this might help.

Thank sand Regards,
Sharad.Kumar
Freelancer
India..

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   1. Electricity consumption mismatch between model and bill
      (Inga Goebel)

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From: Inga Goebel <igoebel at duluthmn.gov<mailto:igoebel at duluthmn.gov>>
To: "'equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>'" <equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>>
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Date: Fri, 25 Oct 2019 19:52:53 +0000
Subject: [Equest-users] Electricity consumption mismatch between model and bill
Hello,

I am currently struggling with a problem concerning the electricity consumption of the building I modeled in eQuest. eQuest predicts a way higher electricity consumption than it actually was billed for by the power provider. eQuest predicts a usage of about 330 MWh a year and the actual bills were at 73MWh for a year. Being sure that the power provider doesn’t give away free electricity, I am currently trying to figure out where I made a mistake.

One possible problem could be, that I included all the mechanicals (like pumps, AHU, fan, unit heater, boiler,…) in the plug loads (misc. equipment), which I read later, I should not do. But I am also not able to find where I can correct it without going back to the wizard and losing all my changes made in detailed mode.  Now it is only shown as equipment load which (if I understand correctly) includes my plug loads and also the electricity consumption calculated by eQuest of the HVAC system. So is the consumption of the HVAC system accounted for twice? Since I only want to redo my plug loads, how can I do that without interfering with the eQuest calculation of the HVAC electricity usage? Any help with that?

Also, these loads should not be a majority of the building and the overall consumption will still be too high (at least that’s my guess). Anyone ever had the same problem?
Lights consumption is about correct.

Thank you for your help.

Inga Goebel

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