[Bldg-sim] District Thermal System

[May Xu]

Hi Jeff, 

Thanks, I found many useful information there, it is a very good
resource! However, I didn't get relative answers regarding my question,
which is about the simulation rule updated by USGBC recently about the
district thermal system. Could anyone give me any suggestions?

Thanks a lot!

May

-----Original Message-----
From: Jeff Haberl [mailto:jeffhaberl at tees.tamus.edu] 
Sent: Tuesday, August 05, 2008 11:36 AM
To: May Xu; bldg-sim at lists.onebuilding.org
Subject: RE: [Bldg-sim] District Thermal System

May:
 
The Laboratory has spent quite a bit of time modeling the thermal plant
on the Texas A&M Campus with good success. Unfortunately, we ended up
using some rather complex, interacting loop models with chiller on/off,
staging algorithms, etc.
 
We have a number of papers and thesis on this at our web site
"www-esl.tamu.edu" look under publications.
 
Jeff
 
8=! 8=) :=) 8=) ;=) 8=) 8=( 8=) :=') 8=) 8=) 8=?
Jeff S. Haberl, Ph.D.,
P.E.............................jhaberl at esl.tamu.edu
Professor......................................................Office
Ph: 979-845-6507
Department of Architecture.......................Lab Ph: 979-845-6065 
Energy Systems Laboratory.......................FAX: 979-862-2457 
Texas A&M University..............................77843-3581
College Station, Texas, USA.......................URL: www-esl.tamu.edu
8=/ 8=) :=) 8=) ;=) 8=) 8=() 8=) 8=? 8=) 8=) 8=) 

________________________________

From: bldg-sim-bounces at lists.onebuilding.org on behalf of May Xu
Sent: Mon 8/4/2008 4:53 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] District Thermal System



Dear All,

 

I'm now working on a project using Districted Heating System provided by
a municipal system. The municipal system is working for a very large
areas providing steam for about hundred buildings. And my building is
one of them.

 

According to the latest update issued by USGBC
(https://www.usgbc.org/ShowFile.aspx?DocumentID=4176), the modeling will
be implemented by two steps. My question is about Step-2 (Aggregate
Building/DES Scenario).  In step-2, the energy source of Proposed
Building is virtual on-site chiller representing upstream DC system. The
document also issues "The DES central plant itself shall always be
modeled as a total, entire unit." My understanding is that it requires
to model the central plant with the full capacity that is able to
provide heating for all of buildings in whole district. However, if
doing so, the energy consumption of the proposed building may be quite
quite high, since it includes the energy consumption of the whole
heating plant!! But my building is only one of the 100 buildings that
are heated by the central plant.  It is weird and  I don't think it is
what USGBC asked for. Does anyone know what shall I do for the proposed
building in Step-2? 

 

Thank you.

May Xu,  LEED(r)AP
Project Engineer - Sustainable Design

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Suite 3705A, Ciro` s Plaza,
388 Nan Jing West Road,
Shanghai, 200003, PRC  

Tel:  (86 21) 6334.6181 ext. 2230 
Fax: (86 21) 6334.6182



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