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Re: [EnergyPlus_Support] air flow limit

To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Subject: Re: [EnergyPlus_Support] air flow limit
From: Emanuel Sá <necas@xxxxxxxxxxx>
Date: Wed, 5 Oct 2005 13:32:23 +0100
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I got the cooling capacity from the same catalog. Thats why I dont know how 
to solve the problem!

Emanuel

----- Original Message ----- 
From: "Michael J. Witte" <mjwitte@xxxxxxxx>
To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Tuesday, October 04, 2005 9:33 PM
Subject: Re: [EnergyPlus_Support] air flow limit


Where did you get the cooling capacity from?

The curves in any of the DX coil example files can be used as generic 
curves.

Mike

On 4 Oct 2005, at 17:45, Emanuel Sá wrote:

> This is a Close control equipment that provides a unferfloor flow. the
> catalog says that for standard conditions (24ºC and 50% RH) the air flow
> through the close control unit is 0.8 m3/s. And I dont have anymore
> information.
> One other question; is there any kind of curves required in the
> COIL:DX:coolingBypassFactorEmpirical that could be used in a standard way?
> Because I dont have any information about the coil performance.
>
> Thank you very much, Emanuel
>
> ----- Original Message ----- 
> From: "Michael J. Witte" <mjwitte@xxxxxxxx>
> To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
> Sent: Tuesday, October 04, 2005 5:23 PM
> Subject: Re: [EnergyPlus_Support] air flow limit
>
>
> > The DX coil model warns when the airflow rate to capacity ratio is 
> > outside the
> > typical range, because this may impact the results.  If the airlfow is 
> > only a
> > little out of range, the results are probably acceptable.  What type of
> > equipment is this?  The reported airflow rate is higher than the upper 
> > limit
> > on the warning check, so this system will not dehumidify very well.  For 
> > the
> > DX coil capacity, check to see if the catalog data is the gross coil 
> > capacity
> > or the net capacity (including the heating effect of the fan).  The DX 
> > coil
> > input should be the gross capacity, which for cooling is the larger of 
> > the two
> > values.
> >
> > Mike
> >
> >
> > On 3 Oct 2005, at 1:25, dust_broom wrote:
> >
> >> Dear all:
> >>
> >> During the simulation this error came up, but I dont understand the
> >> purpose!
> >>
> >> ** Severe  ** Sizing: COIL:DX:COOLINGBYPASSFACTOREMPIRICAL "COIL
> >> SISTEMA UNDERFLOW": Rated air volume flow rate per watt of rated
> >> total cooling capacity is out of range. See Input-Output Reference
> >> Manual for valid range.
> >>    ** Warning ** COIL:DX:COOLINGBYPASSFACTOREMPIRICAL "COIL SISTEMA
> >> UNDERFLOW" - Air volume flow rate per watt of rated total cooling
> >> capacity is out of range at   7.120244238500870E-005 m3/s/w.
> >>    **   ~~~   **  ...VolumeFlowperRatedTotCap=7.120E-005 Occurrence
> >> info=SUMMER DESIGN DAY IN TITLE, 07/21 01:00 - 02:00
> >>    **   ~~~   ** Expected range for VolumeFlowperRatedTotalCapacity=
> >> [  3.356000000000000E-005--  6.713000000000000E-005]
> >>    **   ~~~   ** Possible causes include inconsistent air flow rates
> >> in system components,
> >>    **   ~~~   ** inconsistent supply air fan operation modes in coil
> >> and furnace/unitary objects,
> >>    **   ~~~   ** or variable air volume [VAV] system using incorrect
> >> coil type.
> >>
> >>
> >>
> >>
> >>  The air flow used in this simulation was took from the catalog, so
> >> I should not change it. I would like to know if there is any way to
> >> avoid this error without changing the flow rate, or if I keep the
> >> air flow rate, will this result in substancial errors?
> >>
> >> Thank you, Emanuel
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> 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
> >
> >
> >
> >
> >
> > 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
> >
> >
> >
> >
> >
> >
> >
> >
>
>
>
>
>
> 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
>
>
>
>
>
>
>
>







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References:
- Re: [EnergyPlus_Support] air flow limit
  - From: Michael J. Witte

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