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CS-2009 EAc1:Optimize Energy Performance

Existing Chiller in 100% building construction refurbishment

I am wondering how to handle an existing chiller in a LEED C&S project. The building of the C&S project got 100% refurbishment for the building constructions. The central chiller plant has been reused from the old building. Can the existing air cooled chiller be used as chiller in the baseline model or do I have to use the water cooled chiller from ASHRAE table. Thanks for your help.

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Sat, 08/13/2011 - 10:24

Oops - no answer until now. Is there really nobody who can answer my question ? Any hint where i can find information or help would be appreciated ? Regards Heinrich
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C Yuen
LEEDuser Basic Member
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Tue, 08/23/2011 - 02:57

You will have to the baseline from ashrae.
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Fri, 08/26/2011 - 18:51

In our opinion the general guidance in 90.1 indicates that you only have to bring a system up to code compliance if you are replacing it. Following this logic the baseline system should be identical to the proposed for this system. As you can see this is a gray area and there are other opinions.
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C Yuen
LEEDuser Basic Member
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Thu, 09/01/2011 - 09:50

If you are not replacing the chiller, then you do not need to follow the pre-requsites for EA, but i believe that you have to use the baseline as stated in ashrae, otherwise your energy saving can still be huge despite an old chiller.

Mon, 03/05/2012 - 05:06

I'm glad I've searched for this, I have the exact situation. The system selection for baseline model will have a great impact to the lighting and envelope adjustments to comply with EAp1. Is there a new CIR that addresses this matter?
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Mon, 03/05/2012 - 14:47

I am not aware of an interpretation. We based our opinion on the language in the 2007-90.1 User's Manual (page G-21). It clearly states that if there is an existing system it should be modeled identically in both models. But as I said there is not complete consensus on this issue. There appears to be some contradiction between the User's Manual and the language in the Standard (Table G3.1#10 (Baseline). Perhaps your project could submit an interpretation and settle the issue for LEED projects?

Tue, 03/06/2012 - 02:39

will do. thanks Marcus!

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