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Re: [EnergyPlus_Support] Re: Autosizing full FA with heat recovery
I cannot think of a direct way to get the autosized fresh air flow rate to
equal the autosized system flow rate. Unless someone else can think of a way,
you will need to put the required fresh air flow rate inputs in as hard numbers
after you know what the system sizing will be.
Mike
On 16 May 2006 at 8:45, Elmer Morrissey wrote:
> Hi Fred,
>
> Thank you for your response.
>
> Is it possible to to force 100% fresh air through the system when
> autosizing a heat recovery unit for the fresh air? (you probably
> implied that in your answer, I'm sorry if I didn't pick up on it).
>
> Kind regards
>
> -Elmer
>
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, fred buhl <wfbuhl@...>
> wrote:
> >
> > Elmer - it is my impression that one can size an air system (and
> subsequent
> > plant) for 100% outside air by choosing "Cooling 100% Outside
> Air" to
> > be yes
> > in System Sizing (and maybe also "Healing 100% Outside Air" yes).
> Can one
> > have the autosizing take into account heat recovery? No. That is
> on the
> > to do list.
> >
> > Fred Buhl
> >
> > Elmer Morrissey wrote:
> >
> > >Hi Mike,
> > >
> > >Thank you for the response. I am trying to autosize the OA air
> > >flowrate but I want full FA (I can't recirc the air due to
> > >pollutants). As a result, I want to size the full system, so I
> want
> > >to autosize the full plant so that it can deal will tempering
> 100%
> > >FA conditions. So I guess, I am trying to autosize everything on
> the
> > >air and water loop. Should this pose problems?
> > >
> > >From what you are saying, if you are trying to autosize
> absolutely
> > >everything , you can't force full FA through the air loop (when
> you
> > >have a heat recovery unit). Am I right in saying this?
> > >
> > >Kind regards
> > >
> > >-Elmer
> > >
> > >
> > >
> > >--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
> > ><mjwitte@> wrote:
> > >
> > >
> > >>Sorry about the slow response. I do not understand the
> question.
> > >>
> > >>
> > >What are you
> > >
> > >
> > >>trying to autoszie - the coils or the OA flow rate? It may not
> be
> > >>
> > >>
> > >possible to
> > >
> > >
> > >>do this with autosizing. You may have to get preliminary sizes
> > >>
> > >>
> > >and force some
> > >
> > >
> > >>flow rates or capacities once you know the main system flow
> rate.
> > >>
> > >>
> > >Perhaps with
> > >
> > >
> > >>more details or an input file, we can determine how to help.
> > >>
> > >>Mike
> > >>
> > >>
> > >>On 8 May 2006 at 23:22, Elmer Morrissey wrote:
> > >>
> > >>
> > >>
> > >>>Hello all,
> > >>>
> > >>>How can you autosize full fresh air when you have a heat
> recovery
> > >>>system in an AHU.
> > >>>
> > >>>The system is a Heat recovery -> Mixer -> fan -> heating coil -
> >
> > >>>
> > >>>
> > >zone
> > >
> > >
> > >>>-> return
> > >>>
> > >>>In the past, I used an enconmizer to dummy up full FA control
> > >>>throughout the year. However, I have to set the controller to
> > >>>
> > >>>
> > >BYPASS
> > >
> > >
> > >>>in the Controller: OUTISIDE AIR which makes the old way
> > >>>
> > >>>
> > >impossible to
> > >
> > >
> > >>>implement.
> > >>>
> > >>>Can anyone point me in the right direction?
> > >>>
> > >>>Kind regards
> > >>>
> > >>>-Elmer
> > >>>
> > >>>
> > >>>
> > >>>
> > >>>
> > >>>
> > >>>
> > >>>
> > >>>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@
> > >>
> > >>
> > >>
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >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
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>
>
>
>
>
>
> 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
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>
> 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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