[EnergyPlus_Support] Re: COMIS AIR FLOW: Opening

["alexandrevarela2000" <amv@xxxxxxxxxxxxxxxxxxxxx>]

Hello Ian,

Thank you for your reply and input. I'm now using a Cd of 0.001 wich 
is almost 0 (this is the lowest value I can use withou getting the 
error). This option is can be discussed, but this results in an 
opened area of 0.006m2 (for my window). I´m no trying to understand 
if this area is acceptable to be the equivalent of a closed window 
(closed window as "crack").

The thing is that I wanto to control COMIS as CONSTANT (Ventilation 
Control Mode). Using enthalpy difference I would have to use the 
enthalpic control mode.

Thank you for your input, I will surely keep it in mind,
Alexandre


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Ian Doebber 
<ian.doebber@a...> wrote:
> I had the same problem when I was using COMIS. I could never get 
the program
> to work with all Cd = 0 and then have COMIS calculate it for me.  
What I
> ended up doing was setting Cd = 1 and then adjusted the amount of 
the window
> opening factor based upon the enthalpy difference between my inside 
and
> outside conditions.  When I had Cd = 1 and did not have the window 
opening
> factor, my air flow through my house was ridiculous, ~100 ACH or 
more.
> Based upon a couple of studies Huang et al 1987 and the Building 
America
> program, the outside ventilation rate should be around 7 to 12 ACH.
> Therefore, I kept adjusting my window opening factor such that my
> ventilation rate was on this order of magnitude.  I now this method 
seems
> contrived but it seemed like the only reasonable method to take.  
Hope this
> helps.
> 
>  
> 
>  
> 
> Ian
> 
> 
> ___________________________________________________________________
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> 
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