[BLDG-SIM] System Type in Appendix G

[Lee Shawn]

Hi, Bill,

 

My understanding agrees with Gail's.  I only need to mention one more
thing in your statement.  I do not think the Appendix G limits you to
use only one single packaged rooftop VAV system to do the job.  You may
use a few units of the same type based on the building situation, and
you are permitted to use a few constant flow roof tops if a certain
exception met.  

 

Shawn Lee

Beardsley Design Associates 

Aurburn, NY

 

________________________________

From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of gail
Sent: Tuesday, December 12, 2006 2:43 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] System Type in Appendix G

 

Hi Bill,

 

Your interpretation is the correct interpretation.  This is specific to
Appendix G (the Performance Rating Method), and does not impact basic
code compliance (the Energy Cost Budget Method from Chapter 11).

 

I expect the change was made in order to encourage the selection of more
efficient system types for various buildings.  With the energy cost
budget method, buildings that select inherently efficient system types
are not credited for this selection because the Baseline case moves with
the Proposed case.  Similarly, buildings that select inherently
inefficient system types are not penalized for this selection.  Appendix
G attempts to correct this by 

 

You are correct that the number of systems modeled in the baseline
building may be high.

 

Gail Stranske

CTG Energetics, Inc.

 

On 12/12/06, Bill Talbert <btalbert at aeieng.com> wrote: 

All,

I'm working on a LEED energy analysis for a small healthcare clinic
project (~15K sqft). According to A90.1-2004 Appendix G, Table G3.1.1A,
the baseline HVAC system for a nonresidential building with <=3 floors,
<75K sqft, and fossil fuel heating should be a packaged single zone
system with DX cooling and a gas-fired furnace for heating. This seems
like a big departure from the baseline system types indicated in the ECB
method. Is this a correct interpretation? If so, can anyone provide
feedback as to why this change was made?  It seems as though many
buildings of this size would utilize a packaged rooftop VAV. Also, it
potentially makes the number of systems necessary in the baseline
building significantly high unless the thermal blocks are simplified in
the proposed design model. 

Thanks,

Bill Talbert, LEED AP
Mechanical Engineer
Phone: (608) 441-6677



 

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