[Bldg-sim] [Bldg-rate] District Thermal Energy in LEED

[Sam Mason]

Paul,
I would be careful about moving forward with this issue. A CIR might be
the best bet considering your different fuel source. I bet they will
tell you to use oil, which requires a greater baseline efficieny for the
boilers.

 

And Eric, in step 1, the baseline heating system is purchased heat which
is usually accomplished with a meter. There is no heating equipment
attached.  The purpose of this step is to hold the district energy
system cost neutral to show the actual building cost savings. In step 2,
you model the heating equipment as per Appendix G.

 

Sam

 

--

Sam Mason

Environmental Designer

Atelier Ten

 

+1 (212) 254-4500 ext 221

sam.mason at atelierten.com <mailto:sam.mason at atelierten.com> 

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of estuder
Sent: Tuesday, May 05, 2009 6:26 PM
To: Paul Riemer; bldg-sim at lists.onebuilding.org;
bldg-rate at lists.onebuilding.org
Subject: Re: [Bldg-sim][Bldg-rate] District Thermal Energy in LEED

 

Hello Paul,
Based on my understanding the base case for Step 2 is the same as the
base case for Step 1, which would be a gas-fired, 80% efficient hot
water boiler (or two boilers depending on the size of the facility).  It
seems that the reason Step 2 exists is to see the incremental benefits
and penalties associated with using a central plant.  In your case, you
also get to claim financial benefits or penalties associated with usinig
coal as the fuel source.  Distribution losses are always penalties.
Eric


__________________

Eric Studer, PE
Project Manager
DMI
35 Walnut Street
Wellesley, MA
(781) 431-1100 ext 12
Fax: (781) 431-1109



	-------Original Message-------
From: Paul Riemer 
Subject: [Bldg-rate] District Thermal Energy in LEED
Sent: May 06 '09 01:11

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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