[BLDG-SIM] [Campus Chilled Water] eQUEST: Central Chiller for Baseline?

[Jon Evans]

Sam and others,

 

I have a follow-up question related to your response on 9/25 to purchased
chilled water and LEED modeling. 

 

I have a baseline building using ASHRAE 90.1 System 1 (PTAC Units). The
proposed building is using campus chilled water and fan coil units or water
source heat pumps.  Do I use electric as the source for the PTAC cooling, or
the campus chilled water? Using campus chilled water with PTAC units is not
a realistic option, but it seems like 90.1/LEED requires this (Table 11.3.2A
in 90.1-2004)- would USGBC consider this fuel switching?

 

Also, as a general survey, what are the going rates for campus chilled water
and steam?  I have seen ~$0.70/therm chilled water (generated by absorption
chillers) and $0.35/therm for steam for a college dormitory. I think these
rates will vary by campus and end use.

 

Thanks for your guidance in advance.

 

-Jon 

  _____  

From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Sam Mason
Sent: Tuesday, September 25, 2007 8:31 AM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] eQUEST: Central Chiller for Baseline?

 

Yoko,

In note 5 under Table 11.3.2A, 90.1-2004 says for systems using purchased
chilled water, no chillers shall be modeled and CHW costs shall be
determined using the adopting authority's utility rates.  For both the
baseline and proposed buildings, you would not include central chillers and
instead use purchased chilled water.

 

Sam

 

--
Sam Mason
Atelier Ten
sam.mason at atelierten.com
  

  _____  

From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Yoko
Matsuyama
Sent: Monday, September 24, 2007 8:09 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] eQUEST: Central Chiller for Baseline?

 

Hi, everyone,

 

I am modeling a building that is served chilled water from a central
chiller, and the building doesn't have any individual chiller. 

I am wondering if  the baseline model (by ASHRAE 90.1-2004) should follow
ASHRAE specified "type and number of chillers" (TABLE G3.1.3.7, ASHRAE
90.1-2004) depending on building conditioned floor area, or it should be
modeled with a Central chiller as proposed/designed model.  

 

Thank you for your help

 

 

YM 

Graduate Mechanical Engineer

 
 
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