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CS-v4 EAc2:Optimize energy performance

Baseline Heat Rejection System 7

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Ciaran McCabe
Director
Passive Dynamics Sustainability Consultants
LEEDuser Basic Member
12 thumbs up

Hi I am using Baseline system 7 and I notice that the heat rejection energy is higher than expected.   

ASHRAE 90.1 2010 SI edition states "The heat rejection device shall be an axial fan cooling tower with two speed fans, and shall meet the performance requirements of Table 6.8.1G." Table 6.8.1.G states a performance required of ≥ 3.23 L/s.kW.

Is there a way of cross checking that the Baseline Heat Rejection fan has been auto sized correctly. e.g. Condenser loop flow rate vs  cooling tower fan power. For example in my case the condenser loop length = 73.02 l/s and the fan power = 22.6kW. (73.02 / 22.6 = 3.23) ??

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

Fri, 07/20/2018 - 20:05

Not sure how to cross check this but it appears as if you are calculating the fan power correctly. How you might go about this would certainly be software specific.

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