[Bldg-sim] Basecase Supply Fan Power - ASHRAE 90.1-2004 (LEEDCOMMENT)

Bishop, Bill wbishop at pathfinder-ea.com
Wed Nov 18 06:51:33 PST 2009


Ashraf,
 
Your reviewer is asking you to demonstrate that you used ASHRAE
90.1-2004, Appendix G section G3.1.2.9 to calculate the fan energy in
your Baseline model.
You could supply a spreadsheet showing each system and the calculated
fan power. I don't know what the "HVAC System Summary" is in the
Explanation Required part of your message, so I can't address that part.
If you're concerned about how/if you should split fan power into
individual fans in each system, you can search the Bldg-sim Archive for
more specific advice:
http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/
http://lists.onebuilding.org/htdig.cgi/bldg-sim-onebuilding.org/2009-Jul
y/009534.html
 
Regards,
Bill
 
William Bishop, EIT, LEED(r) AP | Pathfinder Engineers & Architects LLP
Mechanical Engineer
 
134 South Fitzhugh Street
Rochester, NY 14608
T: (585) 325-6004 Ext. 114
F: (585) 325-6005
wbishop at pathfinder-ea.com
www.pathfinder-ea.com
P Please strive to live sustainably.
________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Ashraf khan
Sent: Wednesday, November 18, 2009 8:39 AM
To: bldg-sim at lists.onebuilding.org
Cc: 901mech at lists.onebuilding.org
Subject: [Bldg-sim] Basecase Supply Fan Power - ASHRAE 90.1-2004
(LEEDCOMMENT)
 
Hello Everyone,
 
Presently I am working on LEED NC V2.2 projects. My project is Office &
Warehouse; I received a comment from USGBC on EAc1 - Optimized Energy
Performance.
 
Comment:
It is unclear that Fan power is according to ASHRAE G3.1.2.9. Please
provide the detailed calculations. Please revise the sum of the supply,
return, exhaust (including Warehouse ventilation) and relief fans for
each HVAC system to be equal to the power calculated in G3.1.2.9. 
 
Submitted data:
I have incorporated Fan details as per ASHRAE G3.1.2.9 in Energy
Modeling software (Visual DOE). But I need more clearance about the
comment.
 
Explanation required:
As per my knowledge, Energy Modeling HVAC System Summary Calculations is
different with from Actual HVAC Load calculations. Also CFM, Cooling
Capacity, Fan Power Consumption, Total Power Consumption differs from
actual. How to incorporate Exhaust ventilation fans energy?
 
It would be appreciated if I get full details about ASHRAE G3.1.2.9 and
recommendations of LEED. 
 
Thanks & regards,
Ashraf
 
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