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

On 10/18/07, Jon Evans <jevans@xxxxxxxxxxxxxx> wrote:

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@xxxxxxxx [mailto:BLDG-SIM@xxxxxxxx] On Behalf Of Sam Mason
Sent: Tuesday, September 25, 2007 8:31 AM

To: BLDG-SIM@xxxxxxxx
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@xxxxxxxxxxxxxx

From: BLDG-SIM@xxxxxxxx [mailto:BLDG-SIM@xxxxxxxx] On Behalf Of Yoko Matsuyama
Sent: Monday, September 24, 2007 8:09 PM
To: BLDG-SIM@xxxxxxxx
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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