[Equest-users] Source VS site EUI

Nicholas Caton ncaton at catonenergy.com
Tue Jan 6 12:24:23 PST 2015


Unless I am missing something, if you are using the Energy Star target
finder / portfolio, I belive it is pretty clear you are intended to input
the site energy consumption, and the web tool/interface will apply the
factors to determine source emissions.



If you are trying to perform these calculations yourself, without using
energy star’s interface, then you would need to apply such factors to come
up with a source emissions estimate.



Hope that helps,



~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:* Farid Pour [mailto:farid.pour at hok.com]
*Sent:* Tuesday, January 06, 2015 12:10 PM
*To:* David Eldridge; Nicholas Caton
*Cc:* equest-users at lists.onebuilding.org
*Subject:* RE: [Equest-users] Source VS site EUI



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:* David Eldridge [mailto:DEldridge at grummanbutkus.com
<DEldridge at grummanbutkus.com>]
*Sent:* Tuesday, January 06, 2015 2:08 PM
*To:* Nicholas Caton
*Cc:* Farid Pour; equest-users at lists.onebuilding.org
*Subject:* Re: [Equest-users] Source VS site EUI



I believe that source energy figures in ENERGY STAR use one set of national
conversion factors to calculate source energy from site energy for
everyone. (Not sure about international locations.)



"Emissions" reported by ENERGY STAR for a facility can be specific for
eGrid regional differences.



DSE Mobile


On Jan 6, 2015, at 1:23 PM, Nicholas Caton <ncaton at catonenergy.com> wrote:

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] *On
Behalf Of *Farid Pour
*Sent:* Tuesday, January 06, 2015 10:05 AM
*To:* 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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