Forum discussion
NC-2009 EAp2: Minimum Energy Performance
Hello everybody,
I´m simulating a LEED Project.
When calculating the powers of the fans as G3.1.2.9, the result is adequate. Fans are constant flow, and the system is PSZ-HP (System 4).
Analyzing the simulation results, the annual consumption of the fans are 30% of total consumption of base building, it really is a very high value if compared with the consumption of the proposed building fans.
It is normal, these flows base building?
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
July 16, 2013 - 10:32 am
That result is reasonable if the baseline are constant volume fans and the proposed are variable speed fans.
VICTOR MORENO
Green Building Energy ConsultantGreen Living Projects
2 thumbs up
July 16, 2013 - 11:08 am
In this project, Proposed Building, fans are constant volumen too, but exist radiant floor anf fancoils.
The total flow in baseline is 70 m3/s, and the total flow in proposed is 23 m3/s.
The anual fan consumption in baseline is 500.000KWh
The anual fan consumption in proposed is 30.000KWh
Is it normal??
Thanks
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
July 16, 2013 - 11:34 am
A 94% reduction in fan energy use is not normal based on the information you provided. This level of claimed savings would be questioned in a LEED review. Make sure to double check the baseline fan power calculations.
VICTOR MORENO
Green Building Energy ConsultantGreen Living Projects
2 thumbs up
July 17, 2013 - 3:18 am
To calculate fan power, the results of the G3.1.2.9 are total power (supply and exhaust) or I have to input these results to fan supply and fan exhaust independently ???
Thanks
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
July 17, 2013 - 8:55 am
The results are total fan power. You can check your results using the fan power calculator under the Documentation Toolkit in the header above.