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.
You rely on LEEDuser. Can we rely on you?
LEEDuser is supported by our premium members, not by advertisers.
Go premium for
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
September 9, 2014 - 11:01 am
There are several variables so it is hard to say without the specific data. Are the Proposed pumps variable speed?
Toni Herena Montull
Project EngineerAiguasol
4 thumbs up
September 9, 2014 - 2:58 pm
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.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
September 9, 2014 - 3:26 pm
Variable speed versus constant speed can have a large energy impact. Depending on the difference in kW this may explain your result.
Francesco Passerini
engineer90 thumbs up
September 10, 2014 - 5:48 am
Have you considered paragraph G3.1.3.5 "Hot water pumps" for the baseline model? Regards
Toni Herena Montull
Project EngineerAiguasol
4 thumbs up
September 15, 2014 - 4:29 am
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!
Francesco Passerini
engineer90 thumbs up
September 15, 2014 - 6:07 am
G3.1.3.5.: "The pumping system shall be modeled as primary-only"