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[EnergyPlus_Support] Re: Extremely High Cooling Load due to Ventilation

In a few days OpenStudio 0.7.4 should be up on the developer section of the OpenStudio website. That version addresses the issue with ventilation rates when mixed space types are used in a thermal single zone..

David Goldwasser

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "tgha_ray" <raymond@...> wrote:
>
> I think I found the reason for the problem...
> When I changed all the spaces in the zone to the same type, the problem disappeared.  
> 
> According to the InputOutput reference:
> "One or more infiltration objects can be defined for each zone, and the resulting infiltration rate for the zone will simply be the summation of the flow rates specified by the infiltration objects."
> 
> So, I think the 0.28 ACH for each space object was summed to provide the ACH for the zone.  (Why it was as high as I stated below is unknown...)
> 
> What's the best way to have different space types in the same zone without the infiltration problem?
> 
> Thanks again.
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Griffith, Brent" <brent.griffith@> wrote:
> >
> > This is input is far too high " Flow/AreaFlow Rate per Zone Floor Area: 2.3 m3/s-m2"
> > 
> > 
> > From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of tgha_ray
> > Sent: Friday, May 18, 2012 8:32 AM
> > To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> > Subject: [EnergyPlus_Support] Re: Extremely High Cooling Load due to Ventilation
> > 
> > 
> > 
> > Hi all. I've got a similar situation. When I look at the Results Viewer under "Average Outdoor Air During Occupied Hours", infiltration shows 286.153 ach for each of the 4 zones! (All with exterior walls and window subsurfaces.) How did that happen? I used the Outpatient Facility schedules without modification. Is this the result of some basic oversight on my part. It's just a test building with ASHRAE constructions.
> > 
> > Thanks!
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx<mailto:EnergyPlus_Support%40yahoogroups.com>, Ng Poh Khai <ng_khai@<mailto:ng_khai@>> wrote:
> > >
> > >
> > > Dear All, I am trying to do a parametric simulation on the Window-Wall-Ratio of a semi-transparent BIPV. I started with 90% WWR just to make sure that all the values/results make sense. From the 90% WWR simulation run, i received a ideal cooling loads of 77555 kWh/m2 of energy consumption which is too high! From my investigation, I believe that it is due to my zone ventilation or infiltration. As my zone infiltration is only 0.1ACH, i suspect it is the zone ventilation. Without the zone ventilation, the cooling load is only 394 kWh/m2. My input fields for ZoneVentilation:DesignFlowRate are described briefly: Schedule: 0800 - 2000 hrsDesign Flow Rate Calculation Method: Flow/AreaFlow Rate per Zone Floor Area: 2.3 m3/s-m2Ventilation Type: IntakeFan Pressure Rise: nilFan Total Efficiency: 1Constant Term Coefficient: 1 The rest of the fields are default values when I created the object. Can anyone explain to me where did I go wrong to obtain such a high cooling load? Thanks and Best Regards,Poh Khai
> > >
> >
>




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