Re: [EnergyPlus_Support] About the 5zoneAirCooled example

[fred buhl <wfbuhl@xxxxxxx>]

You can just take  the Zone Sizing object for PLENUM-1 out. It is not 
being used in the
sizing calculation.

But this raises the issue -  what effect do plenums have on  the 
calculation of zone  design
air flow rates? The answer can not be found without a sophisticated 
iterative sizing procedure,
which EnergyPlus doesn't have. This is a 1 story building with a return 
plenum in contact with
the flat roof. On a summer design day, there will be a large roof load 
which will mainly effect the
plenum return air temperature; some of this roof load will be exhausted, 
some will appear as a
load on the cooling coil. The question is how to deal with this in the 
sizing calculation. I ended
up deciding to treat the plenum as an unconditioned space in the sizing 
calculation. This is a conservative
decision - it will cause an overestimate of the conditioned spaces' 
design cooling flow rates, but
will do a decent job of sizing the coil. By the way, this case is one of 
the more extreme examples of
return plenum's influence on conditoned zone loads. For a mid-floor in a 
multi-story building, the
influence of a plenum on zone loads is quite small.

Fred Buhl

energypluser wrote:

>Dear all,
>
>     When I simulate the 5zoneAirCooled with its default input, a 
>warning message shows up as follow:
>   ** Warning ** Requested Sizing for Zone="PLENUM-1", Zone is not 
>found in the Controlled Zones List.
>
>       Does it have some influnence upon the simulation results ?How 
>can I fix it up ?
>      3x in advance
>                                            charlie
>
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