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CS-2009 EAp2:Minimum Energy Performance

ASHRAE requirements for dry-coolers

Cooling system in our project (shopping mall) consists of dry-coolers sprayed with water. What are ASHRAE efficiency requirements for dry-coolers? Should they be qualified as air-cooled condensers in Table 6.8.1G?

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Marcus Sheffer
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Wed, 06/29/2016 - 14:10

This sounds like an evaporative cooler which is covered in Table 6.8.1A.

Wed, 06/29/2016 - 14:41

I just wanted to clarify that these dry-coolers are providing chill for heat pump units in tenant spaces. Cooling capacity of one dry-cooler is around 1500kW. I checked Table 6.8.1A and it seems that it covers smaller equipment. What do you think?
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
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Wed, 06/29/2016 - 15:13

I think I don't really understand what type of equipment you are trying to find. Can you pass along more specific information of the equipment? It is certainly possible that the type of equipment is not covered by any of the 6.8.1 tables. If that is the case there is no minimum efficiency you would need to meet. This happens frequently with equipment that is not commonly used in the USA.

Thu, 06/30/2016 - 09:20

Dry-coolers are located on the roof of the building. Large fans create a forced airflow along heat exchangers. They are designed to provide cooling of Ethylene Glycol 35%. Additionally water is sprayed in the opposite direction to the air flow goiung through the coils in order to improve efficiency of the equipment. This system is then connected to the heat pump units which provide air conditioning in tenant spaces. The equipment is similar to this: http://www.luve.it/cms/view/prodotti/co2-refrigeration-systems-special-options/speciali-con-sistemi-spray-wss/s75?language_code=ENG

Fri, 07/01/2016 - 14:06

Or should dry-coolers be qualified as cooling towers, do you have any thoughts on that? If not do you know who can I contact to confirm how this type of equipment should be qualified or to confirm that as you mentioned it's not covered by AHRAE?
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Fri, 07/01/2016 - 15:05

Thanks the details help. It is heat rejection equipment but this particular type is not covered under 90.1-2007. It was added to Table 6.8.1g in 90.1-2010. So technically it does not have a minimum efficiency requirement under LEED 2009.

Mon, 07/04/2016 - 07:38

Thank you for your hepl!

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