[Equest-users] EE4 Modeling Question

[Brian Fountain]

You are exactly right in your approach to putting the HRV fan power in 
the return fan power and your understanding that the return fan sees 
full flow, not OA flow.  So you need to calculate a static pressure and 
efficiency that, in combination with the full flow equals your HRV 
power.  Just assume an efficiency -- say 50% and then calculate the 
equivalent static pressure to equal your HRV fan power.  There is an 
example of this in the EE4 modelling guide.



On 11/17/2010 6:48 AM, Brad Robinson wrote:
> I am not sure if this is the right forum, but I can't seem to find an EE4
> specific list.  My question is concerning the way an HRV is modelled in EE4.
>   Currently I have a rooftop unit with a supply fan only, and a separate HRV.  In
> EE4, there is not option to use a separate HRV.  In order to model an HRV, a
> return fan must be specified. My first thought was to put the power for the HRV
> fans as the return fan power.  The problem is in EE4 this return fan will see
> the full flow of the unit (or almost - exhaust) where as my HRV is less than 1/4
> of the flow.  In EE4 I can only specify static pressure and efficiency for the
> fan.  Is there an accepted way model the power of the HRV fans?  Thanks for any
> help.
>
> Brad Robinson P.Eng, LEED AP
> brobinson at arcengineering.ca
>
> ARCEngineering Inc.
> 144 Peach Tree Lane
> Grimsby, ON L3M 5C1
> P • (289) 235-8212
> C • (905) 321-5907
> F • (289) 235-8213
> www.arcengineering.ca
>
>
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