[Equest-users] Non-Coincident Peak Demand and Coincident Peak Demand

[Nick Caton]

Put another way:

Coincident peak = "whole building" = the maximum draw on a meter in a given month.  These numbers show what is happening in the hour of the month the most electricity/gas is drawn.
Non-coincident = "in isolation" = a non-coincident peak informs you the maximum draw, irregardless of the building peak.  These numbers will inform you stuff like when you want to know the hardest your fans ever run, what to size a cooling loop for, or the most your lighting system draws considering scheduling.

The distinction Vikram mentions is important:  If you add all Non-coincident peak demands together over a time period (a month for example), you can easily arrive at a sum higher than any actual meter reading.

~Nick

[cid:489575314 at 22072009-0ABB]

NICK CATON, P.E.
SENIOR ENGINEER

Smith & Boucher Engineers
25501 west valley parkway, suite 200
olathe, ks 66061
direct 913.344.0036
fax 913.345.0617
www.smithboucher.com

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Sami, Vikram
Sent: Monday, August 13, 2012 12:25 PM
To: Nimesh Prajapati Nimesh; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Non-Coincident Peak Demand and Coincident Peak Demand

In theory, coincident peak should be less than non-coincident peak. The coincident peak is the components that contribute to the building peak, while the non-coincident is the peak for each individual component (that may occur at different times of the day) - so it should be higher.


Vikram Sami, LEED AP BD+C
Sustainable Design Analyst
1315 Peachtree St. NE, Atlanta, GA 30309
t: 404-443-7462    f: 404.892.5823       e: vikram.sami at perkinswill.com<mailto:vikram.sami at perkinswill.com>   www.perkinswill.com<http://www.perkinswill.com/>
Perkins+Will.  Ideas + buildings that honor the broader goals of society


From: equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Nimesh Prajapati Nimesh
Sent: Monday, August 13, 2012 9:06 AM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Non-Coincident Peak Demand and Coincident Peak Demand

Dear All,

In eQuest Output files I am getting one output parameters as Non-Coincident Peak Demand and Coincident Peak Demand. So I am confused in analysis. My Question is - what is the difference between them?

Refer the attachment.

Which is the true reflected Peak Demand of the building analyzed?

Thanks,
Nimesh Prajapati

(+91 9687133492)
HVAC Design Engineer


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