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[EnergyPlus_Support] Re: Help with VAV to Constant Air Volume

Thanks Karen.

I did check my unmet hours. While VAV is meeting it well, CAV with high heating consumption is still not meeting it for lot more hours

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Karen Walkerman <kwalkerman@...> wrote:
>
> One thing to check is the number of unmet thermostat setpoint hours.  This
> is often the reason for high energy use differences between two models.
>  One may be using much less energy, but it is also not meeting the setpoint
> temperatures.  Also, check to make sure that each piece of equipment is
> sized properly in both models.  It's possible that the equipment is
> significantly oversized, and the VAV system was able to make up for this by
> significantly reducing the supply air flow.
> 
> I can't think of any reason you can't change from a VAV to CAV system in
> the manner you describe.
> 
> --
> Karen
> 
> On Fri, Nov 18, 2011 at 10:35 AM, energyplus.1984 <energyplus.1984@...
> > wrote:
> 
> >
> >
> > I have also posted my CAV with high heating and VAV files for reference
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "energyplus.1984"
> > <energyplus.1984@> wrote:
> > >
> > > Hi,
> > >
> > > I converted my Variable Air Volume file to Constant Air Volume and my
> > heating consumption has increased by almost 6 times. The weather file used
> > is Chicago. What are the possible reasons that would lead to such a change?
> > >
> > > To do the VAV conversion i converted Zone HVAC Air Loop Terminal Units
> > to Constant Volume, Fans to constant volume, removed the damper. My file is
> > running without errors.
> > >
> > > Is my method of making it Constant Volume ok? Any help is appreciated.
> > >
> > > Thanks,
> > >
> > > J
> > >
> >
> >  
> >
>




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