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[EnergyPlus_Support] Re: Adding more chillers doesn't reduce the autosized value
Dear James,
What about the cooling towers sizing factor? should it be set to 0.5 too? or just for the chillers? because after setting chillers sizing to 0.5 and towers sizing to 0.5 too, I have the towers fans power (at high speed mode) and the condensers pumps powers reduced to only 25% of the previous power before putting 0.5 sizing factor to both chillers and both towers and having all set to 1 (chillers and towers).
Please advise. Thank you very much.
Best regards,
Hisham
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Jim Dirkes <jim@...> wrote:
>
> ..or 1.25 in Sizing:Parameters which applies to all zone sizing (plus 0.5 in the object Sizing Factor
>
> James V Dirkes II, PE, BEMP, LEED AP
> www.buildingperformanceteam.com<http://www.buildingperformanceteam.com/>
> Energy Analysis, Commissioning & Training Services
> 1631 Acacia Drive, Grand Rapids, MI 49504 USA
> 616 450 8653
>
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of fpasserini.tn@...
> Sent: Friday, October 11, 2013 6:32 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] RE: Adding more chillers doesn't reduce the autosized value
>
>
>
> If I model a baseline model according to ASHRAE 90.1-2007 and two boilers are connected in parallel (e.g. in System 5) shall I use 1.25 as "zone heating sizing factor" in the object Sizing:Zone and 0.5 in "Sizing Factor" in the object Boiler:HotWater?
>
> Best Regards
>
>
> ---In energyplus_support@xxxxxxxxxxxxxxx<mailto:energyplus_support@xxxxxxxxxxxxxxx>, <jim@<mailto:jim@>> wrote:
>
> Dear Hisham,
>
> An autosizing value always represent the entire load serve by the autosized component. When there is more than one component (e.g., chillers) on a single loop, EACH component is assigned 100% of the autosize value. Not very intuitive, but thatâ??s how it works in E+.
>
> If you want each chiller to have 50% of the autosized value, assign 0.50 to the â??Sizing Factorâ??.
>
>
>
> James V Dirkes II, PE, BEMP, LEED AP
> www.buildingperformanceteam.com<http://www.buildingperformanceteam.com/>
> Energy Analysis, Commissioning & Training Services
> 1631 Acacia Drive, Grand Rapids, MI 49504 USA
> 616 450 8653
>
>
>
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of hisham.rashrash
> Sent: Thursday, October 10, 2013 6:50 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>
> Subject: [EnergyPlus_Support] Adding more chillers doesn't reduce the autosized value
>
>
>
>
>
> Dear all,
> I am modeling baseline for some project, and I am trying to follow ASHRAE's 90.1-2007 section G3.1.3.7 "Type and Number of Chillers (Systems 7 & 8)" by adding more chillers until no chiller's size is above 2813[kW] (refer to table G3.1.37). The problem is no matter how many chillers I add, this doesn't reduce the autosized value! it is always the same=4258257.73[W] for all chillers, while I expected to have this value divided on chiller's number I add, for example, for one chiller it was autosized to 4258257.73[W], for two chillers I expected it to be 4258257.73[W]/2=2129128.865[W], while it was autosized to 4258257.73[W] for each chiller!
> Please advise.
>
> Thank you very much,
> Hisham.
>
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