[Equest-users] Difference between Electricity consumption figures

David Brodrecht dbrodrecht at zonengineering.com
Mon Oct 6 14:28:21 PDT 2014


Hi Harshul,

I'd be interested in knowing if there's any suggestions for the reporting as well.

I ended up doing a run without the co-gen to see the electric consumption separately for an approximation.

David Brodrecht
Zon Engineering Inc.

From: Singhal, Harshul [mailto:HSinghal at ThorntonTomasetti.com]
Sent: Monday, October 06, 2014 5:15 PM
To: David Brodrecht; equest-users at lists.onebuilding.org
Subject: RE: Difference between Electricity consumption figures

Hi David

Thanks for reply. Indeed I made a mistake in adding extra zero. Sorry about that. And even I thought that 907 therms are going for some electricity but my extra Zero made me confused.

So, how can I get real electricity consumption values for each end use type? Any report/method you suggest? I need to report energy consumption for each & every end use separately.

Thanks again.
Harshul Singhal
Project Consultant
Thornton Tomasetti
386 Fore Street, Suite 401
Portland, ME  04101
T +1.207.245.6060  F +1.207.245.6061
D +1.207.245.6074
HSinghal at ThorntonTomasetti.com<mailto:HSinghal at ThorntonTomasetti.com>
www.ThorntonTomasetti.com<http://www.ThorntonTomasetti.com>
From: David Brodrecht [mailto:dbrodrecht at zonengineering.com]
Sent: Monday, October 06, 2014 5:08 PM
To: Singhal, Harshul; equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: RE: Difference between Electricity consumption figures

Hi Harshul,

I recently came across this same anomaly.

If I recall correctly, check the "Fuel used to generate electricity offsite = 907 Therm". If you convert that through to kWh with the efficiency of your generator, you should find your missing kWh. You also added a zero to the kWh... should be 9,500kWh not 95,000kWh.

907 Therm * 29.3 kWh/THerm * (35.7%?) = 9500.

Regards,

David Brodrecht
Zon Engineering Inc.

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Singhal, Harshul
Sent: Monday, October 06, 2014 4:25 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Difference between Electricity consumption figures

Hi everyone

I am doing this project (VAV with electric reheat system) which has absorption chiller (connected to 1st Cogen plant exhaust loop and Steam 1 meter) and preheat coils (connected to 2nd Cogen plant exhaust loop and Steam 2 meter). There is no ERV installed on the system and there are 2 Cogen plants each 1 MW power. Cogens are electrically tracked for the case.

Here I saw something interesting at BEPU report which I never came across. The total electricity consumption is 455,541 KWH as per this report but when I added all end uses energy consumption (37796 + 0 + 141858........ + 427), total is 464,529 KWH. The difference is almost 95,000 KWH.

Can someone please explain me what's the reason of difference between Total electricity consumption Versus "number I got after adding all end use electricity consumption". I used to think BEPU report shows exact numbers whatever they are after Cogen plants savings at electricity side. 95,000 KWH is a big number.

Thanks a lot in advance.
[cid:image001.jpg at 01CFE18A.411C64B0]

Harshul Singhal
Project Consultant
Thornton Tomasetti
386 Fore Street, Suite 401
Portland, ME  04101
T +1.207.245.6060  F +1.207.245.6061
D +1.207.245.6074
HSinghal at ThorntonTomasetti.com<mailto:HSinghal at ThorntonTomasetti.com>
www.ThorntonTomasetti.com<http://www.ThorntonTomasetti.com>


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