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Re: [EnergyPlus_Support] Re: Humidity
In a fan coil system, the supply fan pulls the air in through the outside air
mixing box. If the actual system has separate outside air fans, then adjust
the fan pressure in the supply fan object as required to result in the same
power consumption.
Mike
On 3 Dec 2005, at 2:38, eric_zhou1223 wrote:
>
> I guess I was not able to expound my equestion well. What I meant
> was how I can get the TRANSPORT energy for the vehicle which brings
> outside air to the indoor environment. I.e. a fan in the Fresh Air
> Unit(FAU) or whatever . Anyhow outside mixer has to cost something
> taking air from outside, while it seems not be considered as far as
> I know.
> Not the energy use after outside air has been in the space.
>
> Eric
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
> <mjwitte@g...> wrote:
> >
> > 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
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> > > > and press the
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> > > > > > 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
> > >
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> > >
> > > Attachments are not allowed -- please post any files to the
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> >
> >
> >
> > ========================================================
> > Michael J. Witte, GARD Analytics, Inc.
> > EnergyPlus Testing and Support
> > EnergyPlus-Support@g...
> >
>
>
>
>
>
>
>
> The primary EnergyPlus web site is found at:
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>
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>
> Attachments are not allowed -- please post any files to the appropriate folder
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>
> Yahoo! Groups Links
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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