Hi all,
I am trying to get an idea of how to model a new mixed use building (Office
+ retail) with a existing district cooling plant serving other office
buildings on the site for LEED purposes.
Since it is a district cooling system, the plant load, efficiency ,
performance and operation is dependent on the other existing buildings on
the site as well. I am not sure how to separate the energy metrics in the
model for the plant associated with the new proposed building.
1.Does the baseline building model also has to take into consideration the
existing plant in simulation or the baseline will be just modeled is it
will be for a new building with the plant type being decided by the
conditioned square footage of the new proposed building?
2. When modeling the proposed building, do i neglect the effects of other
building on the district cooling plant performance and use the part load
efficiency curves and load shedding schedules for the plant equipments (
towers, pumps, Chillers) as if they were serving only the new proposed
building? has anyone done a model like this and how does the LEED
guidelines approach this issue?
The simulation community help is much appreciated.
Please respond if you have any questions as well.
--
Thanks
Sincerely,
Amit Bhansali
There is a guide that ASHRAE/LEED uses to model the district cooling
plants. There is two methods to utilize, and each have their benefits and
constraints. It is mentioned where to find it in the LEED manual and in
the most recent EAp2 Table 1.4 downloads.
Hope this helps,
Rob
There is also a guide made by the CaGBC
Martin Roy, ing. PA LEED
Amit,
There's a fairly comprehensive document, "Treatment of District or Campus Thermal Energy in LEED V2 and LEED 2009 - Design & Construction," which explains the options available to you, of which there are three:
* Measurement of existing plant to determine efficiencies
* Simulation of existing plant with existing building to determine efficiencies
* If data is unavailable for the above 2 options, then defaults are allowed.
You model your baseline building as a normal standalone building, with the relevant chiller plant for the climate zone etc. Let me know if you can't find a copy of the guide and I'll send one over.
Regards,
Edwin Wealend
Thanks to all,
i got the document "treatment of district or campus thermal energy...."
yesterday and it has enough information for me to model the building.
Thanks for all your help.
--
Thanks
Sincerely,
Amit Bhansali