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Re: [EnergyPlus_Support] Re: Calculated load different from component sizing summery





All, thanks for your help-- 

I found out the issue is: 

"The zone loads are sensible-only, and do not include ventilation loads.  Also, the "calculated" loads (and those in the zsz file) do not include any sizing factor.  The component sizing includes factors to actually size system coils and equipment-- such as sensible, latent, ventilation loads, and sizing factors."



Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions
120 E. Pritchard St.  | Asheboro, NC 27203  | Mobile 503-688-8951
 

  






On Fri, Sep 14, 2012 at 1:54 PM, Jeremiah Crossett <jcrossett@xxxxxxxxxxxxxxx> wrote:
YI, sorry to have had your name wrong- the tables with the highlighted values again are-
Report: ComponentSizingSummary 
ZoneHVAC:IdealLoadsAirSystem
Maximum Heating Air Flow Rate [m3/s]Maximum Cooling Air Flow Rate [m3/s] Maximum Total Cooling Capacity [W]
ZONE1AIR 0.0131460.0589071007.43
Report: HVACSizingSummary 
Zone Cooling 
Calculated Design Load [W] User Design Load [W]Calculated Design Air Flow [m3/s]User Design Air Flow [m3/s] Design Day NameDate/Time Of PeakTemperature at Peak [C]Humidity Ratio at Peak [kgWater/kgAir]
BLOCK1:ZONE1 792.83792.830.0590.059 LOS ANGELES INTL ARPT ANN CLG 1% CONDNS DB=>MWB8/21 16:32:0026.280.00955



Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions
120 E. Pritchard St.  | Asheboro, NC 27203  | Mobile 503-688-8951
 
  






On Fri, Sep 14, 2012 at 1:49 PM, Jeremiah Crossett <jcrossett@xxxxxxxxxxxxxxx> wrote:
Jason, Thanks for your input it was very helpful. 

YI, thanks for your response- however  Apparently did not read the post or look at the tables because the values you sent have nothing to do with the discrepancy between the
Maximum total cooling capacity" and the "calculated design load"  The values in question are highlighted in yellow and make up a rather large discrepancy is not from a sizing multiplier.

The questionable values are 
  • Calculated Design Load [W]= 792.83
  • Maximum Total Cooling Capacity [W]=  1007.43 
  • Delta [W] = 214











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