[EnergyPlus_Support] Re: Zone Exhaust and Return Fan

["thimmannaharshana" <thimmannaharshana@xxxxxxxxx>]

Thanks all. 

I agree that the summary/component sizing summary is showing max flowrate. I have my exhaust flow scheduled on when ever the system is on and i checked it on an hourly basis. Is there is a different report I should be looking at for return flow ?

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Vinay Devanathan <vinay.devanathan@...> wrote:
>
> Which HTML report are you looking at? Like the sub-heading under which you
> are finding this? If you are looking at Fan Reports in Equipment
> Summary/Component Sizing Summary, then it might show you the Max Flow Rate
> (airflow capacity) possible through the fan which might be the same in both
> Supply and Return Fan case to take care of the airflow in case exhaust fan
> is not working at any hour.
> 
> On Tue, May 1, 2012 at 12:37 PM, thimmannaharshana <
> thimmannaharshana@...> wrote:
> 
> > **
> >
> >
> > Thanks for your response and sorry I didn't read your question correctly.
> >
> > Exhaust fans are modeled as zone equipment fans similar to the ones in
> > example file. When I looked at the hourly results, it make sense.The return
> > flow from the zone is equal to the supply flow minus the exhaust flow and
> > the same is true at the system level. However, the html report shows the
> > same flow for both supply and return fans.
> >
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Vinay Devanathan
> > <vinay.devanathan@> wrote:
> > >
> > > How have you modeled the exhaust fan?
> > >
> > > On Tue, May 1, 2012 at 10:45 AM, thimmannaharshana <
> > > thimmannaharshana@> wrote:
> > >
> > > > **
> >
> > > >
> > > >
> > > > Hi all,
> > > >
> > > > I have modeled supply, return and exhaust fans for a system. when I
> > look
> > > > at the results, the amount of airflow is same for both supply and
> > return
> > > > fan. Energy plus is not accounting for the amount of exhaust flow while
> > > > calculating the return flow. The exhaust fan flow rate is reported
> > > > separately.
> > > >
> > > > Supply fan -6500 cfm
> > > > Return Fan -6500 cfm
> > > > Exhaust fan -550 cfm
> > > >
> > > > I am using energyplus for LEED submission and i guess this is a
> > problem.
> > > >
> > > > Does any one know how to solve this and get the correct return airflow?
> > > >
> > > > Thanks in advance,
> > > > Harshana
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > > --
> > > Vinay Dev
> > >
> >
> >  
> >
> 
> 
> 
> -- 
> Vinay Dev
>




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