[Equest-users] BEPU space heating calculation

[John Aulbach]

Ben - dumb question.

How is internal load figuring into this equation? And solar gain from the sun?

I NEVER get an exact U x A x dT savings, as eQuest takes ALL factors into 
consideration.

John R. Aulbach, PE, CEM
Senior Energy Engineer

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PartnerEnergy
1990 E. Grand Avenue, El Segundo, CA 90245
W: 888-826-1216, X254| D: 310-765-7295 | F: 310-817-2745
www.ptrenergy.com| jaulbach at ptrenergy.com




________________________________
From: Ben Pressman <bpressman at practicalenergy.net>
To: equest-users at lists.onebuilding.org
Sent: Wed, August 25, 2010 1:32:04 PM
Subject: [Equest-users] BEPU space heating calculation

I have a Window Glass EEM run that upgrades the windows in a 1970s school 
building from single-paned to double-paned, tinted, and argon-filled; a decrease 
in U-factor from 1.04 to 0.35. The LV-D report shows a decrease in building 
U-factor from 0.176 to 0.142 which, based on an HDD calculation:

(0.176-0.142)*24hrs*(estimated HDD for my area)*A/eff = 1217 therms

of savings, or 24.7% of the overall energy usage of my baseline model. The BEPU 
report, however, shows almost no energy savings. How can this be? Is there some 
way to see what schedule, or number of degree days the calculation in the BEPU 
is using? Has anyone had this sort of problem?

Thanks,
Ben

-- Ben Pressman
Project Engineer
Practical Energy Solutions
770 E. Market Street, Suite 250
West Chester, PA 19382
ph  610.430.1382
cell  610.733.9518
web  www.practicalenergy.net


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