[EnergyPlus_Support] simple fan-assist natural ventilation

["zhaicq98" <chaoqinz@xxxxxxxxxxxxxx>]

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+.

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?

thanks,
Chaoqin




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