[BLDG-SIM] LEED and evap chillers

Michael Rosenberg Michael.Rosenberg at state.or.us
Wed Jul 12 10:18:31 PDT 2006


Appendix G in 90.1, 2004 sets the baseline system type based on the size
and program of the building. If the building is less than 150,000 sqft,
the cooling type is direct expansion, either as part of a packaged VAV
system or a packaged single zone system. If the building is > 150,000
sqft, the cooling type is chilled water, and the heat rejection devise
is a cooling tower. In almost all cases if your proposed design has a
peak cooling load of 150 tons or less, it will be to serve a building
less than 150,000 sqft, and your baseline system will be direct
expansion cooling.

Mike

Michael Rosenberg
Oregon Department of Energy
625 Marion St. N.E.
Salem, OR 97301-3742
Phone : (503) 373-7809
Fax: (503) 373-7806

>>> "Farhan Khatri" <FKhatri at arnoldandosheridan.com> 7/12/2006 9:17:07
AM >>>
Mitch/Wade and Team,

Is it also true for LEED 2.2 (PRM method app. G 90.1 2004)
I cannot find a reference to 150 Ton exception in LEED 2.2 manual. 

Searched for CIRs on LEED 2.2 regarding the 150 Ton allowance but
there
were none. However, did find the CIR on LEED 2.1 regarding the 150 Ton
allowance for 'air-cooled'. It is also mentioned under LEED 2.1 EMP
(energy modeling protocol). 

So how does it apply to LEED 2.2 or it doesn't.

Thanks,
Farhan Khatri, P.E. LEED AP.
Arnold & O'Sheridan, Inc.


-----Original Message-----
From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of
Mitchell
Dec
Sent: Wednesday, July 05, 2006 12:38 PM
To: BLDG-SIM at gard.com 
Subject: [BLDG-SIM] LEED and evap chillers

Wade,

I had a similar question submitted to the USGBC and it was deemed a
water-cooled system. However, if the capacity is less than 150 tons,
there was a CIR allowing the use of an air-cooled systems.


 
Mitchell J. Dec
Energy Analyst 
 <http://www.glumac.com/> 
  _____  

320 SW Washington, Suite 200
Portland, OR 97204-2640
T.  503.227.5280  F. 503.274.7674
Direct: 503.345.6283

Thinking. Inside the building.
http://www.glumac.com/ 


-----Original Message-----
From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com]On Behalf Of
wmclaughlin
Sent: Wednesday, July 05, 2006 10:11 AM
To: BLDG-SIM at gard.com 
Subject: [BLDG-SIM] LEED and evap chillers


This may have been covered in a previous thread, but I'm away from my
email archive at the moment.

Regarding LEED modeling with respect to the ASHRAE ECB/DEC method:
Does
anyone have a sense of whether an evaporatively-cooled chiller is
considered air- or water-cooled?   It makes a considerable difference
to
the modeling of the ECB (base case), and thus to the evaluated
savings.

Thanks,

Wade McLaughlin
Demand Management Institute

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