[BLDG-SIM] Moving Target (kBtu/sq.ft/yr) in the Performance Calcs

Abhijeet Pande pande at h-m-g.com
Thu Apr 26 11:10:22 PDT 2007


Ryan,
The standard building HVAC equipment selection is based on the type of
system you select for your proposed buildings. Rules for equipment
selection are explained in the Nonresidential ACM manual of the CA Title
24. These rules are intended to provide objective baseline energy
consumption for a given system type -- thus a DX system is compared to a
DX system, and a hydronic system is compared to a hydronic system. 
For details see "Table N2-10 - Standard Design System Selection
Flowchart" of the 2005 Nonresidential ACM Manual
(http://energy.ca.gov/title24/2005standards/nonresidential_acm/2005_NONR
ES_ACM_MANUAL.PDF)
Hope this helps,

Abhijeet Pande
Senior Project Manager          |       Heschong Mahone Group Inc.
436 14th St., Suite 1123, Oakland CA 94612 

ph (510) 451-7001               |       fax (510) 451-7002
pande at h-m-g.com                 |       web site: www.h-m-g.com 


________________________________

From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Ryan
Hammond
Sent: Thursday, April 26, 2007 10:33 AM
To: BLDG-SIM at gard.com
Cc: Nathan Fleischer
Subject: [BLDG-SIM] Moving Target (kBtu/sq.ft/yr) in the Performance
Calcs



Question regarding T-24 and the TDV Standard.

 

Why is the kBtu/sq.ft/yr for the Standard bldg a "moving target" for
performance calcs? 

 

Specifically, why does the Standard bldg energy consumption change as
the proposed HVAC system changes? 

 

We have always seen this as a serious flaw in the performance calcs (as
in using EnergyPro), and have yet to get a straight answer from anyone. 

 

Thanks again for the help.

 

Sincerely,

R. Ryan Hammond, LEED(r) AP

Designer

 

G U T T M A N N & B L A E V O E T 

C o n s u l t i n g E n g i n e e r s

 

2351 Powell Street                  1111 Howe Ave., Suite 155

San Francisco, CA 94133       Sacramento, CA 95825

P  (415) 625-0730                   P  (916) 921-1981

F  (415) 625-0735                   F  (916) 921-1921

E  RHammond at gb-eng.com

W www.gb-eng.com

 


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