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CS-2009 EAp2:Minimum Energy Performance

Pump consumption

I have a proposed design with boiler and chiller, with water distribution. There are many pumps in the distribution system. In the other hand, I have a baseline building with a system 5 (VAV) and a hot loop with a boiler. This baseline only has a pump in the hot loop. eQuest results says that there is more consumption for Pumps and AUX for the baseline than for the proposed. This shouldn't be like this, I guess. What do you think? Reasons? Thank you in advance.

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

Tue, 09/09/2014 - 15:01

There are several variables so it is hard to say without the specific data. Are the Proposed pumps variable speed?

Tue, 09/09/2014 - 18:58

Marcus, yes, hot water loop and cold water loop have VS pumps. The basline building has just one pump, for the hot water loop, but there is no pump for the cold water loop, as it has been defined as a VAV system.
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 09/09/2014 - 19:26

Variable speed versus constant speed can have a large energy impact. Depending on the difference in kW this may explain your result.

Wed, 09/10/2014 - 09:48

Have you considered paragraph G3.1.3.5 "Hot water pumps" for the baseline model? Regards

Mon, 09/15/2014 - 08:29

Thanks Marcus and Francesco, Yes, Francesco, I have considered that paragraph G3.1.3.5., but it seems to me too few pumps in the baseline... One more question, this hot water pump for the baseline, has to be equivalent to....?? the primary loop pumps? primary and secondary loop pumps? Thanks guys, you are really helping me!

Mon, 09/15/2014 - 10:07

G3.1.3.5.: "The pumping system shall be modeled as primary-only"

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