[EnergyPlus_Support] Re: Exhaust Fan Increases Cooling Load

["iluminasol33" <iluminasol33@xxxxxxxxx>]

Thanks for the tip Jean. So, just to make it clear, when I add the exhaust fan into a zone then the air that goes trough it comes from the outside? So how can these fans be modeled correctly? 

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Jean marais" <jeannieboef@...> wrote:
>
> 
> Ha! And where does the makeup air come from? Outside. Now you have to cool more outdoor air. 
> 
> This is correct. If you want to incorporate the effect of exhausting hot air directly from source to achieve reduced heat gain to the space (eg using kitchen hood equipment) then this is best reflected where you specify the heat gain, for example a equipment heat gain with 50% "lost" would reflect (roughly, depending on manufacturer specifications) the effectiveness of a cooking exhaust hood equipment. 
> 
> For recessed lighting, I believe one can specify the fraction going directly into the exhaust air (about 30%, from memory). 
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "iluminasol33" <iluminasol33@> wrote:
> >
> > Dear forum,
> > 
> > I have a particular problem that when adding a zone exhaust fan in one zone with high internal loads, the cooling load increases. I was expecting it would decrease since the fan is taking warm air out so it helps the HVAC system somehow. For that zone I have a DX cooling coil, in a Unitary Furnace: Cool Only. 
> > 
> > I would appreciate any help. Thanks in advance.
> > 
> > Santiago
> >
>




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