[Equest-users] BEPU space heating calculation

[Ben Pressman]

  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