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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

Chillers COP consideration equivalent

Hi There, We are looking into a project which an office building and is going to be LEED certified. The project is air conditioned by air cooled screw chillers (2 Nos of 250 Tons each). Client wants to use a chiller made in italy. It follows European specification and its performance is tested based on European standard. Kindly advise is European specification chiller acceptable in a LEED certified project? Will it hinder the LEED certification. Further note that it is complying in terms of the COP specified by ASHRAE 90.1 2007. But however as mentioned that is in terms of the European standard. Hence please advise on the above in this situation the optimal solution as well as methodology to be followed to demonstrate compliance. Regards, Imran

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 07/09/2013 - 20:14

It depends on the equipment efficiency. Since it is a mandatory provision of 90.1, you will need to demonstrate that the efficiency as tested against the European standard meets or exceeds the ASHRAE 90.1-2007 minimum efficiency. Hopefully the manufacturer can help you figure out how to demonstrate this.

Wed, 07/10/2013 - 06:38

HI Marcus, Thanks for the reply. The supplier has confirmed that the performance is in accordance with EN 14511 & ECC (Eurovent Certification Company) rating standard 6/C/003. Further have provided me selections at 35 'C with COP 3.0, EER-3.04 which is equivalent to ASHRAE 90.1 requirement of 2.8 COP and EER- 3.06. Is this sufficient to demonstrate compliance or should I request for additional information from the supplier? Secondly while modelling and demonstrating compliance with LEED, does only Full Load COP needs to be considered or part load COPs should also be taken into account? Should I consider this criteria as well while evaluating the above chillers? Please advise
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Wed, 07/10/2013 - 13:48

You do realize that based on the EER above the equipment does not meet the ASHRAE minimum efficiency. Some documentation from the supplier/manufacturer would be helpful. Your modeling software should include performance curves for the equipment to take into account part load efficiency.

Thu, 07/11/2013 - 09:18

Thanks Marcus, Yes it is marginally away. So I believe that means LEED will not accept this?
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Thu, 07/11/2013 - 14:47

Technically the minimum is a minimum. It is very close so you might be able to seek an exception. A LEED Interpretation would be one way to get an official ruling. You could also try to work with the individual reviewer when you submit it.

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