Re: [EnergyPlus_Support] Zone return air path

[Chris Jones <cj@xxxxxxxxx>]

The return air problem is an interesting one.  Say for example, you have 
compartment fans on each floor and a single OA fan serving all floors.  A 
portion of the return air on each floor goes to the compartment fan (or fan 
coils, heat pumps, etc) and a portion goes to relief - which may be through 
a heat recovery system connecting fresh air and relief  air.  How would you 
model that in EnergyPlus?  My guess is that you can't.



>Hi Chunming:
>
>I am trying to find out if this limit can be increased.  If not, you
>are limited to 10 plenums per air primary loop.  You cannot use more
>than one return air path in an air loop, so you would need to use 2
>air primary loops in your building.  We do not have any examples of
>this.  You need to repeat the air primary loop and all of its
>subcomponents (branch list, main branch, coils, fan, supply air path,
>return air path, controllers, etc.).  Your chilled water/hot water
>supply loops can serve both air loops.
>
>Mike
>
>On 22 Apr 2003, at 23:14, HSIEH Chun-Ming wrote:
>
> > Hello,
> >
> > I am chunming. I have a question about zone return air path.
> > In each of the "ZONE RETURN AIR PATH",  there is a limitation that at
> > most 10 component can be input. But now, I am simulating a building
> > with 15F, each story with a plenum on it. That means 15 plenums here.
> > Do I need to create the other new zone return air path or even a air
> > primary loop in this case? Is there any example with mutiple air paths
> > or air primary loop in E+? Thank you very much.
> >
> > Chunming
> >
> >
> >
> >
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Chris Jones, P. Eng.
14 Oneida Avenue
Toronto, ON M5J 2E3
Tel. 416 203-7465
Fax. 416 203-8249




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