[EnergyPlus_Support] Re: How to calculate Fan Pressure Rise

["wasilqayyum" <wasilqayyum@xxxxxxxxxxx>]

Thanks for the answer.

I do infact know how to calculate pressure drop etc. But I get very low results like 8 Pa (just the horizontal section of earth tube). Whereas, the values often used is around the 400 Pa range. So my really value has left me confused.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Jean marais" <jeannieboef@...> wrote:
>
> I have never used this object. I assume that it is the same as the hvac fan objects, meaning that a direct relationship exists between air flow Q, total efficiency, nominal rated pressure rise dP and Nominal Rated Power E.
> 
> To calculate dP you need
> Power (W)
> Flow  (m3/s)
> Total Efficiency ()
> 
> If you don't have Power and you really must calculate the pressure drop in your pipes at a specific mass flow, then you'll need to dust off the old fluid mechanics text books, find the section on Reynolds numbers and flow in rectangular or circular ducts and hand calculate it. Or find some other program to do it.
> 
> I don't know if E+ has something on their site to do this? Basic slide rule stuff. I think one can simulate it as well, but I've never done it.
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "wasilqayyum" <wasilqayyum@> wrote:
> >
> > Hello,
> > 
> > There is a field in zone earth tubes called "Fan Pressure Rise". Can someone please tell me how to calculate this value?
> > 
> > Thanks.
> >
>




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