[Equest-users] Proposed Case fan power modelling

[Daniel Knapp via Equest-users]

Hello Mayank,

The correct fan power to model is the input power to the motor. This can be determined by dividing the brake horsepower by the motor efficiency (i.e. 4.73 BHP/90% = 5.26 hp) and should be slightly larger than the bhp and smaller than the motor hp.

All the best,

Daniel

  


—
Daniel Knapp PhD, P Phys, LEED AP
danielk at arborus.ca

Energy Efficiency Expert
Arborus Consulting
2-43 Eccles Street
Ottawa ON K1R 6S3
(613) 234-7178

> On Jul 18, 2017, at 7:24 AM, Mayank Bhatnagar via Equest-users <equest-users at lists.onebuilding.org> wrote:
> 
> Hello Everyone,
> 
> 
> Ours is a Residential Project with PTAC units and DOAS in the Proposed design. The DOAS nameplate motor HP is 7.5 where as the fan absorbed power is 4.73 BHP. If we model 7.5 HP; we are falling short of the minimum LEED energy performance requirements. Modelling
> 4.73 BHP just gives us enough savings.
> 
> Which one is the correct fan power to model?
> 
> I have been through the archives and didn't find appropriate answer. Please help!
> 
> Regards,
> 
> Mayank.
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