Re: [EnergyPlus_Support] (Still) airflow balances!

[Fred Buhl <wfbuhl@xxxxxxx>]

Ana,

I guess we don't understand what you are trying to simulate. You have 2 
zones,
one of which gets supply air. Just tell us what happens to this air after it
is supplied to the 1st zone. Don't explain it in terms of EnergyPlus, 
just tell us
what you actually want to happen. Are there any real exhaust fans, or 
did they get
introduced as an attempt to model the actual situation? Just explain 
what the system
is that you are attempting to model (maybe you did this already, but 
please do it again).

Fred Buhl

anarui.oliveira wrote:
> 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.
>
>
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