[EnergyPlus_Support] Re: (Still) airflow balances!

["anarui.oliveira" <anarui.oliveira@xxxxxxxxx>]

Thank you!
Ana.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Griffith, Brent" 
<brent_griffith@...> wrote:
>
> I don't believe the zone exhaust in the remote, unconditioned zone
> directly affects the model prediction of zone conditions.  The air 
is
> just leaving at the resulting zone temperature, not affecting what 
that
> temperature is.  
> 
>  
> 
> Unless you want to model heat recovery on that exhaust stream, the 
only
> reason to care would be for the exhaust fan's electricity use.  
> 
>  
> 
> ________________________________
> 
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx
> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of 
anarui.oliveira
> Sent: Monday, April 28, 2008 4:36 PM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] (Still) airflow balances!
> 
>  
> 
> Thank you all for your previous answers, and please tolerate my 
> insistence...
> I see your point about balancing airflows in the source zone, and 
I 
> think I've got that covered.
> 
> ...But, returning to a simple example of 2 zones:
> - one conditioned (Zone 1), with forced supply air (which can be 
> modelled by E+ system and zone level objects)
> - and another unconditioned (Zone 2), which:
> - receives some airflow by depression from the conditioned zone 
> (here I would use a Mixing object(source Zone 1, target Zone 2), 
and 
> an exhaust fan in Zone 1 (a plain E+ Exhaust fan, no tricks), just 
> to make sure that the source zone also feels the effect of losing 
> that amount of conditioned air)
> - but then in the unconditioned zone, the HVAC project says there 
> will also be a regular, forced exhaust airflow (although there is 
no 
> mechanical air supply directly to this zone), and it is this part, 
> this exhaust... this balance at the unconditioned zone (which is 
the 
> target zone for the mixing object), that I don't quite see how to 
> implement...
> - and should I care?... It's not very clear to me, but I seems 
> that if I do force the exhaust of that amount of air, the 
> unconditioned zone will continuosly lose some its partially 
> conditioned air (energy), at the same time as it receives new air 
> from the adjacent zone, while if I don't balance it, it seems it 
> continuosly accumulates warm air and only loses heat through the 
> envelope?...
> 
> Sorry, I have the feeling I'm not making myself very clear, but...
> ... again, any additional hint would be greatly appreciated!
> 
> Ana.
> 
>  
> 
> 
> 
> [Non-text portions of this message have been removed]
>



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