[Bldg-sim] LEED District Steam Rules: baseline step 1 vs step2

Ryan Del Balso Ryan at ambient-e.com
Wed Dec 2 14:41:11 PST 2009

I am working on a LEED energy model for a small <5000sf project that has
a hot water loop served by a campus district steam loop.  I am trying to
follow the "Required treatment of District Thermal Energy in LEED NC2.2"
rules, but am unclear of the requirements it is asking for.  I
understand the requirements for the proposed Step 1 and Step 2, but the
baseline requirements seem quite unclear to me.


This building falls in the System 3: PSZ-AC with Fossil Fuel Furnace
heating type.  


My understanding of the requirements are as follows:

- Step 1 baseline: because it is supposed to be cost neutral, I model
the systems with a hot water loop and coils served by purchased steam
rather than the normal 90.1 System 3- fossil fuel furnace.

-Step 2 Baseline (this is where I am more unclear):  

Option 1: model this exactly as described in App G, system 3: with a
fossil fuel furnace with 90.1 efficiency (i.e. no hot water loop and
coils, and no steam boiler).  

Option 2: model this with the hot water loop and coils as in step 1, and
put in a hot water boiler with the efficiencies listed in 90.1?

Option 3: model this with the hot water loop and coils as in step 1, and
put in a steam boiler with the efficiencies listed in 90.1?



Please let me know if I am understanding step 1 correctly and which
option should be followed for step 2.

Thank you for your help. 




Ryan Del Balso, PE

Building Performance Engineer

ryan at ambient-e.com

130 W. 5th Avenue, Denver, CO 80204 

t 303.278.1532x210 | f 303.278.8533 |

ambient-e.com <http://www.ambient-e.com/> 







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