[Bldg-sim] Purchased Chilled Water Systems for DES LEED Modeling

[amit bhansali]

Hi BLDG-SIM Users,
We are working on a new LEED Office/Retail Project that intends to use the
Existing District Cooling System (Cooling Towers) for cooling. The proposed
building will have water cooled self contained units rejecting the heat to
the condenser water from the District Cooling Towers.

Based on the document from USGBC "Treatment of District or Campus Thermal
Energy in LEED 2009", we are looking into modeling this as Option 1 -
Building Stand Alone Scenario, where we disregard all the upstream
equipment energy. In the proposed building, this only constitutes for the
HEAT REJECTION on the towers.

However, our system type in Baseline comes out to be System 6 which is
changed to System 8 using the Table 3 in LEED Manual mentioned earlier.
System 8 is VAV with Reheat with cooling energy associated with Chillers
and Cooling towers. Also, we are to disregard the Purchased Cooling from
both baseline and proposed to keep the model DES neutral.

1. Does Chillers, Chilled Water Pumps, Condenser Water Pumps, and Cooling
Towers modeled in the Baseline need to be all considered as part of the
Purchased cooling and thus excluded from the Savings calculations?
2. If we have a Condenser water booster pump for the new building in the
proposed building, should we also model a condenser water pump for the new
building at 19 W/GPM (ASHRAE 90.1)  for baseline and include both of them
as part of the downstream equipment energy?

Your help is very appreciated.

Thanks and we look forward to your suggestions.


-- 
Thanks

Sincerely,
Amit Bhansali, BEMP, LEED Green Associate, M.S. , EIT
Mobile: (+1)972-207-5180
             (+1)405-312-1047

www.godparents.in
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