[Bldg-sim] District Thermal Energy in LEED

[Seth P. Spangler]

In the Step 2 model for the baseline, you DON'T use the same district
energy system used in the proposed.  Instead, you use on-site boilers of
the type specified in ASHRAE 90.1 Tables G3.1.1A and Tables G3.1.1B.

 

Interestingly enough, this is a contradiction from what is stated in
paragraph G3.1.1.1 of 90.1, but USGBC has clarified their intention in
soon to be released updates of the DES Guide.  

 

 

Seth Spangler, LEED(r) AP 

Design Engineer

 

RMF Engineering, Inc 

Ph: (843) 971-9639 ext:1497

Fax: (843) 971-9641 

sspangle at rmf.com

________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Paul Riemer
Sent: Tuesday, May 05, 2009 4:12 PM
To: bldg-sim at lists.onebuilding.org; bldg-rate at lists.onebuilding.org
Subject: [Bldg-sim] District Thermal Energy in LEED

 

Fellow Modelers,

I would greatly appreciate any answers and comments on formulating a
submission and/or CIR.

 

I am working on a LEED project which is heated by steam from a coal
fired plant and is subject to the USGBC's District Thermal Energy
document https://www.usgbc.org/ShowFile.aspx?DocumentID=4176.

Should the baseline hot water boiler plant in the Step 2 analysis be:

A) a coal fired boiler with the proposed boiler efficiency since 90.1
does not address coal fired boilers,

B) a natural draft coal fired hot water boiler with an assumed code
efficiency since 90.1 does not address coal fired boilers,

C) a natural draft gas fired hot water boiler with the code efficiency
referenced in 90.1, or

D) something else?

 

Remember the metric is energy cost savings.

 

If you reread it, replacing the word 'coal' with 'trash', does your
answer change?

 

Thank you,

 

Paul Riemer

Dunham

 

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