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Re: [EnergyPlus_Support] Re: Humidity
The best available approach is to run a second simulation with the outside air
flow rate set to zero. The difference in energy consumpiont between the two
simulations will reflect the net change in energy use required to condition
outside air. Remember that outside air can be beneficial on mild days.
Mike
On 2 Dec 2005, at 1:35, hbn_pch wrote:
> Eric,
> In reality,there is no variable to report the energy consumption
> by the outside air system.If you want to gain the value,you should
> use the total energy consumption subtract the fancoil energy
> consumption.
> It's my suggestion.Good luck.
>
> pch
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "eric_zhou1223"
> <eric_zhou1223@y...> wrote:
> >
> >
> > Thank you for your response, Mike.
> >
> > There is another question. How can I consider the energy
> consumption
> > by the outside air mixer in a fancoil system? I didnot found there
> > is a variable in the simulation result which is responsigble for
> the
> > electricity use of transporting the fresh air into the indoor space.
> > As far as I know, that would be a pretty significant part in the
> > HVAC system's energy consumption. Likewise, in the VAv system,
> there
> > exists a similar problem, what would be end user for introducing
> > outdoor air? The central fan in the AHU?
> >
> > Eric
> >
> >
> >
> >
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
> > <mjwitte@g...> wrote:
> > >
> > > I suspect that the window AC is running with cycling fan while
> > the other
> > > systems are continuous fan. Make the the window ac objects (AIR
> > > CONDITIONER:WINDOW:CYCLING and
> > COIL:DX:CoolingBypassFactorEmpirical) are set to
> > > continuous fan (ContFanCycComp).
> > >
> > > Mike
> > >
> > >
> > > On 30 Nov 2005, at 14:49, eric_zhou1223 wrote:
> > >
> > > > Hi,
> > > >
> > > > With thermostats control in some zones, I noticed a
> > windowAC
> > > > system can achieve a notablly lower relative humidity than a
> > fancoil
> > > > system or the whole-air system in summer days. Given that all
> > other
> > > > conditions are kept the same, i,e.,cooling capacity, building
> > > > discriptions, supply air design condition,and so forth. Is
> this
> > result
> > > > reliable? If yes , what would be the reason?
> > > >
> > > > Thank you .
> > > >
> > > > Eric
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > The primary EnergyPlus web site is found at:
> > > > http://www.energyplus.gov
> > > >
> > > > The group web site is:
> > > > http://groups.yahoo.com/group/EnergyPlus_Support/
> > > >
> > > > Attachments are not allowed -- please post any files to the
> > appropriate folder
> > > > in the Files area of the Support Web Site.
> > > >
> > > > EnergyPlus Documentation is searchable. Open EPlusMainMenu.idf
> > and press the
> > > > "search" button.
> > > >
> > > > Yahoo! Groups Links
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > > ========================================================
> > > Michael J. Witte, GARD Analytics, Inc.
> > > EnergyPlus Testing and Support
> > > EnergyPlus-Support@g...
> > >
> >
>
>
>
>
>
>
>
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
>
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
>
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
>
> EnergyPlus Documentation is searchable. Open EPlusMainMenu.idf and press the
> "search" button.
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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