[Equest-users] Source VS site EUI

[Farid Pour]

Dear Nick, thanks for your reply.
I understand that for each eGRID sub-region there is a different emission factor. My confusion is about using source EUI instead of site EUI. I was wondering all eGrid emission factors are calculated based on generated energy (Site energy) and not delivered energy (site). Therefore we might need to first convert the site EUI to source EUI and then use the converted number in the calculation. However, the energy star methodology specifically mentioned to use site EUI.
What do you think.
Thanks



From: Nicholas Caton [mailto:ncaton at catonenergy.com]
Sent: Tuesday, January 06, 2015 1:23 PM
To: Farid Pour; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] Source VS site EUI

To my best understanding, EnergyStar’s portfolio normally takes in your site energy usage and uses the project’s regional location to come up with source figures.  A building located in an area powered largely by hydroelectric will report differently than one located somewhere powered largely by coal plants, all else being equal.

The database which comes up with those regional factors is a bit opaque, however, and the regional resolution have changed over time.

~Nick

NICK CATON, P.E.
Owner

Caton Energy Consulting
  1150 N. 192nd St., #4-202
  Shoreline, WA 98133
  office:  785.410.3317
www.catonenergy.com

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org>] On Behalf Of Farid Pour
Sent: Tuesday, January 06, 2015 10:05 AM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Source VS site EUI

Hi,
Sorry  this question is not about eQUEST, but I thought you might be able to help me. I am in process of calculating the carbon foot print of my building. I have the values for electricity and fossil fuel EUIs.
I also have a report from energy star (https://portfoliomanager.energystar.gov/pdf/reference/Emissions.pdf ) that explain how to calculate the carbon footprint of the building. however, I am not sure that I need to use source EUI in my calculation or site EUI.

Can you please explain?
Thanks,
Fred
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