[EnergyPlus_Support] Re: Energy Plus - adding multiple fancoils to zone in the idf

["jeannieboef" <jeannieboef@xxxxxxxxx>]

Dear James,

I was under the impression that there is a corrilation between fan size and efficiency. One big fan's energy consumption surely can't be the same as many small ones. As for zones, there really are cases where lighting, HVAC&R and occupation types in one multifuction building force one to use many, many zones. I generally don't try to make things harder than they are.

I was actually toying with the idea of creating a virtual zone (air for walls) inside the normal zone, putting one Fancoil into it and then multiplying the entire zone (zone multiplier).

Kind regards,

Jean

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "James V Dirkes II, PE" <jvd2pe@...> wrote:
>
> Dear Jeannie,
> 
>  
> 
> Perhaps you should consider reducing the number of zones and fancoils.
> Generally, a zone can be as large as you desire (e.g., many individual rooms
> in the core of a floor) as long as it has the same occupancy hours, lighting
> density, people density, and orientation to the sun.  Small differences for
> lighting and people density do not influence your results in any significant
> way.
> 
>  
> 
> Similarly, E+ does not care, or produce different results,  if you assign
> one (very large) fan coil to the zone instead of 20 small fan coils.  For
> your purposes, one large fan coil and a lesser number of zones makes it
> easier for you to create the model and probably reduces your run time a lot.
> 
>  
> 
> The Building Performance Team
> James V. Dirkes II, P.E., LEED AP
> 1631 Acacia Drive NW
> Grand Rapids, MI 49504
> 616 450 8653
> 
>  
> 
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx
> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of jeannieboef
> Sent: Wednesday, March 03, 2010 6:23 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Energy Plus - adding multiple fancoils to zone
> in the idf
> 
>  
> 
>   
> 
> I've just started going through the excersize of adding additional fancoils
> to a zone.
> 
> Each FC has to be defined.
> 
> Each additional FC has to lie on it's own branch split from the plantloop
> demand side splitter (as only one splitter per loop is allowed).
> 
> The same for the demand side mixer.
> 
> And the Demand side branch list has to be updated with the extra branches.
> 
> AND THAT'S JUST FOR HOT WATER...the same still goes for CW.
> ------------------------
> Even though all the fancoils may be the same!
> 
> Is their no way to use a multiplier of sorts to only have to do this once?
> Or at least once per Fancoil type?
> 
> I just had a project with hundreds of zones, each with up to 20 fancoils
> consisting of variants of 4 different types.
>




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