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Re: [EnergyPlus_Support] A question about Zone Lise Multiplier



My apologies for the slow response.  Radiant floor systems will not work 
correctly with zone multipliers.  CR#6896 has been submitted to address this 
problem.

Mike


On 3 Feb 2006 at 13:54, Zhen Tian wrote:

> Hello, Mike;
>    
>   Following your response, I multiplied all the capacities of HVAC compoents
> and capacity, chilled water flow rates, air flow rates, pump and fan
> capacities, heating and cooling coils capacities, pipe lengths and water flow
> ratesin radiant system,...and so on.
>    
>   However, it seems that the cooling capacities of radiant system still does
> not be mutiplied.  For example, the air flows rates are increased to 6 times,
> but the total cooling energy uses and radiant system cooling energy uses only
> increase a little bit.  Could you tell me what are the possible reasons for
> causing this problem? Weather the radiant surfaces area been multiplied 6
> times when using the zone multiplier?
>    
>   Regards,
>    
>   Zhen    
>    
>   "Michael J. Witte" <mjwitte@xxxxxxxx> wrote:
>   Yes.  Zone Multiplier and Zone List Multiplier are applied to zone level
> loads. 
> All HVAC equipment serving a multiplied zone must have increased capacities 
> and flow rates to serve the multiplied load, even zone equipment such as 
> radiant slabs, window AC, fan coils, etc.  There is no HVAC system multiplier
> in EnergyPlus.
> 
> Mike
> 
> 
> On 26 Jan 2005, at 11:11, Zhen Tian wrote:
> 
> > 
> > Hello, everyone:
> > 
> > I have a question about using the "Zone List" & "Zone Group" objects. 
> Right
> > now, I just simulate one typical floor for a multi-floor building. Since the
> fan
> > energy use is not linear to the air flow rate. I am considering using the
> zone
> > list and zone group to mimic this multiple floors.
> > 
> > In my model, I set up zone list and then Zone Group and set "zone list
> > multiplier" as 6.  Then I increase the system air flow rate, chilled water
> flow,
> > hot water flow and other system parametrics also 6 times to match the
> reauired
> > air flow and so on.
> > 
> > Do I need to multiply zone equipments capacity? For example, if I have
> radiant
> > cooling slab system and baseoard, do i need to multiply this capacity of
> > equipment?  And do I also need to multiply the "zone air flow rate" and
> > associated capacity of reheat coils?
> > 
> > Thanks for your help.
> > 
> > Regards,
> > 
> > Zhen
> > 
> > 
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> 
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support      
> EnergyPlus-Support@xxxxxxxx
> 
> 
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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