Re: [EnergyPlus_Support] simple fan-assist natural ventilation

["Michael J. Witte" <mjwitte@xxxxxxxx>]

On 5 Jun 2003, at 19:49, zhaicq98 wrote:

> Hi,
> 
> I would like to have fan-assist natural ventiation, which is similar
> to the example file VentilationSimpleTest.idf. The only difference is
> that I want a lower limit for outdoor air temperature, say 52F. When
> outdoor air is cooler than 52F, the ventilation should be shut off
> though it still can provide free cooling to the space. I am wondering
> if there is some way to achieve this in E+.

I do not understand what you mean by "ventilation should be shut off 
though it still can provide free cooling".

> 
> Also, when I looked at the example file VentilationSimpleTest.idf, I
> found the coefficients A, B, C, D in ventilation object are the same
> for natural, intake, exhaust ventilation. The values for these
> coefficients might be true for natural ventilation, but for intake and
> exhaust, I personally do not think they are correct. When indoor and
> outdoor temperature difference becomes bigger (i.e., outdoor air gets
> colder), the ventilation volume should becomes smaller in common
> sense, right? That is why I think the B coefficient might be nagitive.
> Could anyone pls give some explanation on it? And anyone has any idea
> how to decide these coefficients for intake fan assist ventilation?
> 

For forced fan ventilation, the coefficients would generally be 
1,0,0,0, i.e. no difference for different wind speeds and temperature 
differences.  The coefficients are meant for modeling naturally 
driven flow the same as the infiltration object.

> thanks,
> Chaoqin
> 
> 
> 
> 
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