RE: [EnergyPlus_Support] (Still) airflow balances!

["Griffith, Brent" <brent_griffith@xxxxxxxx>]

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.

 



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