Re: [EnergyPlus_Support] Re: Disparate zones for inlet and outlet nodes for an air loop

[fred buhl <wfbuhl@xxxxxxx>]

Elmer - maybe you could email me about this. I wasn't quite paying 
attention.
In the situation you describe all the zones have to be served by one system.
EnergyPlus imposes a mass balance on the air loop - one can't exhaust 
more air
than is supplied or than is supplied in the outside air stream. Remind 
me again of what
your situation is and I'll try to give a more specific answer.

Fred Buhl

Elmer Morrissey wrote:

>Hi Mike, 
>
>If I conglomerate the areas into one zone, I think I can safely ignore
>the degree or two difference in room temperature. However, the AHU
>supplies air at a rate of 141l/s and exhausts at a rate of 204l/s (due
>to the inflated exhaust rates required for toilet areas). I can't seem
>to force this situation? What am I missing? Can I set the extract VAV
>to always extract air at a larger rate than the supply air?
>
>Kind regards
>
>-Elmer
>
>
>
>--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
><mjwitte@g...> wrote:
>  
>
>>My apologies for the delayed response . . .
>>
>>There is no easy way to model this case.
>>
>>The simplest solution is to take the return air from the corridor
>>    
>>
>and forget 
>  
>
>>about the other flows.  If you expect those zones to be at similar 
>>temperatures, this will probably be adequate from an energy use
>>    
>>
>perspective.
>  
>
>>Another option would be to combine the corridor/lobby area with the
>>    
>>
>toilet area 
>  
>
>>into a single zone.  A zone can be made up of non-contiguous spaces.
>>
>>Mike
>>
>>On 11 Jan 2006 at 18:19, Elmer Morrissey wrote:
>>
>>    
>>
>>>One of the AHUs services a particular loop in one area and takes 
>>>extract from another area. It provides ventilation air to a corridor 
>>>and lobby area. However, the return loop is extracting air from three 
>>>toilet areas. These areas are physically separated within the
>>>      
>>>
>building 
>  
>
>>>by 2/3 zones. Is this a problem in EnergyPlus, and do I have to 
>>>conglomerate these disparate areas into one zone (this may be a 
>>>problem with disparate temperature control etc)?
>>>      
>>>
>>========================================================
>>Michael J. Witte, GARD Analytics, Inc.
>>EnergyPlus Testing and Support      
>>EnergyPlus-Support@g...
>>
>>    
>>
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>
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> 
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