[EnergyPlus_Support] Re: Output analysis : Zone Air Balance Surface Convection Rate

["le_carambar" <le_carambar@xxxxxxxx>]

Ok,

Thank you for the answer. 
I would probably never find it alone !

Camille T.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Lixing Gu <gu@...> wrote:
>
> Camille:
> 
> Your observation is correct. The difference is caused by time lag. The zone 
> temperatures used in the Surface Int Convection Heat Rate calculations are 
> the values at the previous zone time step. The zone temperatures used in the 
> Zone Air Balance Surface Convection Rate calculations are the values at the 
> current time step.
> 
> Lixing Gu
> ----- Original Message ----- 
> From: "le_carambar" <le_carambar@...>
> To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
> Sent: Tuesday, July 14, 2009 8:51 AM
> Subject: [EnergyPlus_Support] Re: Output analysis : Zone Air Balance Surface 
> Convection Rate
> 
> 
> >I did new comparaison and sometimes it matches sometimes it doesn't 
> >matches...
> >
> > In fact, it matches when the temperature of the zone is constant, and as 
> > soon as there is temperature variation values become differents.
> >
> > In order to simplify the problem, I study a zone without any windows :
> > - 4 interzone surfaces : N, E, S, O.
> > - 1 floor
> > - 1 roof
> >
> > And I compared the sum of each "surface int convection heat rate" to the 
> > "zone air balance surface convection rate"...
> >
> > According to the definition of "zone air balance surface convection rate" 
> > (The Zone Air Balance Surface Convection Rate is the sum, in watts, of 
> > heat transferred to the zone air from all the surfaces), I though it 
> > should match.
> >
> > There is probably a point I misunderstand !
> >
> > Thanks,
> >
> > Camille T.
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad <RRaustad@> 
> > wrote:
> >>
> >> I should have also told you that convection from window frames and
> >> dividers ARE ALSO included in the Zone Air Balance Surface Convection
> >> Rate report variable (but not the glazing). So the comparison you are
> >> making would not add up exactly if window frames and dividers are used.
> >> If there are no window frames or dividers (or no windows at all), I
> >> would think the numbers should match.
> >>
> >> Richard Raustad wrote:
> >> >
> >> >
> >> > If you want to know the definition of any report variable, search for 
> >> > it
> >> > in the Input Output Reference document. Here is what I found:
> >> >
> >> > The Zone Air Balance Surface Convection Rate is the sum, in watts, of
> >> > heat transferred to the zone air from all the surfaces. This field is
> >> > not multiplied by zone or group multipliers.
> >> >
> >> > I don't think that Window Convection Heat Gain from Glazing to Zone is
> >> > included in the Zone Air Balance Surface Convection Rate. Leave the
> >> > glazing gain out and see if the numbers match up better.
> >> >
> >> > le_carambar wrote:
> >> > >
> >> > >
> >> > > Dear users,
> >> > >
> >> > > I try to understand what is include in the output variable : Zone Air
> >> > > Balance Surface Convection Rate.
> >> > >
> >> > > I did the sum of the "Surface Int Convection Heat Rate" for every
> >> > > surfaces (1 ext wall, 3 interzone surfaces, 1 roof, 1 floor) and
> >> > > "Window Convection Heat Gainfrom Glazing to Zone". And the result is
> >> > > not the same value than "Zone Air Balance Surface Convection Rate".
> >> > >
> >> > > I check output variable "Window Gap Convective Heat Flow" and "Window
> >> > > Convection Heat Gain from Gap between Shade and Glazing to Zone " but
> >> > > they are equal to 0.
> >> > >
> >> > > Can you help me ?
> >> > >
> >> > > thanks,
> >> > >
> >> > > Camille T.
> >> > >
> >> > >
> >> >
> >> > -- 
> >> > Richard A. Raustad
> >> > Senior Research Engineer
> >> > Florida Solar Energy Center
> >> > University of Central Florida
> >> > 1679 Clearlake Road
> >> > Cocoa, FL 32922-5703
> >> > Phone: (321) 638-1454
> >> > Fax: (321) 638-1439 or 1010
> >> > Visit our web site at: http://www.fsec.ucf.edu 
> >> > <http://www.fsec.ucf.edu>
> >> >
> >> > UCF - From Promise to Prominence: Celebrating 40 Years
> >> >
> >> >
> >>
> >> -- 
> >> Richard A. Raustad
> >> Senior Research Engineer
> >> Florida Solar Energy Center
> >> University of Central Florida
> >> 1679 Clearlake Road
> >> Cocoa, FL  32922-5703
> >> Phone:   (321) 638-1454
> >> Fax:     (321) 638-1439 or 1010
> >> Visit our web site at: http://www.fsec.ucf.edu
> >>
> >> UCF - From Promise to Prominence: Celebrating 40 Years
> >>
> >
> >
> >
> >
> > ------------------------------------
> >
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> > http://www.energyplus.gov
> >
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> >
> > 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.pdf under the 
> > Documentation link and press the "search" button.
> > Yahoo! Groups Links
> >
> >
> >
> >
>




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