Re: [EnergyPlus_Support] Re: ZoneVentilation:DesignFlowRate

[Vinay Devanathan <vinay.devanathan@xxxxxxxxx>]

Thanks, Jean. I am just modeling a bathroom exhaust in a residence which is typically on throughout the day, so a constant flow is not a problem. Yeah I guessed about the balancing the exhaust with equal parts of make up air as I was getting unusual results when I tried to supply the same parts of make up air in addition to defining the exhaust air, it seemed to me like there was a lot of OA involved and thanks for confirming it.

Vinay

On Fri, Mar 9, 2012 at 11:33 AM, Jean marais <jeannieboef@xxxxxxxxx> wrote:

 

There are different "exhaust" type objects.

The "Ventilation" type object, from memory, make up the air one to one as you say.

The fan:zoneexhaust does not and when using it you must supply the "make up air" with either one of the many "Ventilation" objects (which include infiltration objects) or in conjunction with AFN objects (which is better, because if the fan rate changes the flowrates will adjust in the AFN to balance the flows, where as with a fixed flowrate ventilation object, you are going to get lots of warnings about unbalanced airflows.)

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Vinay Devanathan <vinay.devanathan@...> wrote:
>
> "For either Exhaust or Intake, values for fan pressure and efficiency
> define the fan electric consumption. For Natural and Exhaust ventilation,
> the conditions of the air entering the space are assumed to be equivalent
> to outside air conditions." - Page 414/1798 under Field:Ventilation Type
>
> My question is - If I say Exhaust as the alpha character, does it mean E+
> will make up the same amount of air that I specify for it to exhaust from
> the Zone? For example, if I want to exhaust 500 cfm, will it make up 500
> cfm by itself for maintaining air balance or should I make up 500 cfm using
> some other airflow object?
>
> Thank you.
>
> --
> Vinay Dev
>

--

Vinay Dev

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