[Equest-users] Total Site versus Total Source Energy BEPS

[Vikram Sami]

In essence Alan is correct. However - for electric energy the largest
losses are not the T&D losses (7.2% according to Wikipedia; 3% according
to the chart below from the DOE) , but the conversion losses at the
plant.  So the site-source utilization is around 33%

 

 

 

For an on-site CH&P generator, you would still have some losses - around
25% conversion loss, so the site-source utilization is around 75%, so
there should still be a discrepancy between the two. 

 

 

Vikram Sami, LEED AP 
Direct Phone 404-253-1466 | Direct Fax 404-253-1366 

LORD, AECK & SARGENT ARCHITECTURE



 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of
Jackson, Alan
Sent: Thursday, October 22, 2009 1:15 PM
To: James Geers
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Total Site versus Total Source Energy BEPS

 

The Site is your building model. Source takes in to account losses and
inefficiencies in delivery of energy from the source "plant", and hence
reflects energy used at that source. If all energy was on site, they
should be equal.

 

Alan Jackson, LEED AP
KlingStubbins

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of James
Geers
Sent: Thursday, October 22, 2009 11:56 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Total Site versus Total Source Energy BEPS

 

I have noticed these two lines on my BEPS report.  Which number
accurately reflects the energy consumption of my building?  What is the
difference between the two?  If all of my energy was generated on site
would the numbers be equal?

 

 

 

TOTAL SITE ENERGY      2517.74 MBTU     29.0 KBTU/SQFT-YR GROSS-AREA
29.0 KBTU/SQFT-YR NET-AREA

TOTAL SOURCE ENERGY    4867.80 MBTU     56.0 KBTU/SQFT-YR GROSS-AREA
56.0 KBTU/SQFT-YR NET-AREA

 

 

Thank you,

 

 

 

JAMES F. GEERS  |  ARCHITECT & LEED AP

513.721.0600 (x107) - DIRECT  

 

SFA ARCHITECTS, INC.

 

CINCINNATI

300 WEST FOURTH STREET  |  CINCINNATI, OHIO 45202  |  513.721.0600 -
OFFICE  |  513.721.0611 - FAX

 

DAYTON

120 WEST SECOND STREET  |  SUITE 1800  |  DAYTON, OHIO 45402  |
937.281.0600 - OFFICE  |  937.281.0611 - FAX

 

WWW.SFA-ARCHITECTS.COM
<outbind://5-000000002A3AAC56F15D2E4D863C658A7EC1FD11C4022E00/www.sfa-ar
chitects.com> 

 

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