[Bldg-sim] District Thermal System

[Jeff Haberl]

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
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________________________________

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®AP
Project Engineer - Sustainable Design

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