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Re: [EnergyPlus_Support] Radiator mass
Another EnergyPlus team member offered another possible approach.
Try using LOW TEMP RADIANT SYSTEM:HYDRONIC radiant heating embedded in an extra
interior surface. The surface could have the mass of the contained water plus
aluminum casing. When the radiant heating shuts down, the thermal mass of this
surface would lose heat to the zone. One problem with this would be the split
between convective and radiant output. You may need to force the convection
coefficient on this surface to be rather high to simulate the convective flow
through the baseboard unit.
Mike
On 15 Dec 2006 at 9:18, Roberto Lollini wrote:
> Thank you for the suggestion. I am going to trying the chance. It would
> be interesting if it would be possible to model baseboard water content
> and relative heat loss as it was a water heater (object that already
> foreseen this).
> Roberto
>
> Michael J. Witte ha scritto:
> > There is no direct way to model this. The best I can suggest is to estimate
> > the rate of heat release from the idle baseboard and add this energy to the
> > zone using an OTHER EQUIPMENT or HOT WATER EQUIPMENT with a schedule that
> > models the decay. This is useful for determining is this quantity of heat is
> > enough to produce the expected zone temperature profile. But it will not be
> > very useful for a long-term simulation where this effect needs to be added only
> > if the heating system was operating at the end of the day. And it will not add
> > load to the boiler.
> >
> > Mike
> >
> >
> > On 14 Dec 2006 at 9:53, Roberto Lollini wrote:
> >
> >
> >> Dear alls, I am simulating a building with an heating plant made of a
> >> boiler and aluminum radiators. When I switch off the boiler the indoor
> >> air temperature decay is more fast than in the real working conditions
> >> (there is a very sharp initial decay and then the trend is quite similar
> >> between real data and simulated ones, but some degrees lower for the
> >> simulation). I would like to input in the simulation also the mass of
> >> the radiators and relative water content (that remain hot for a certain
> >> period after the boiler switching off), but I cannot find any suitable
> >> parameter in the baseboard object or others. Any suggestion?
> >>
> >> Thank you very much. Roberto
> >>
> >> ___________________________________________________________________________________
> >> ITC-CNR
> >> Istituto per le Tecnologie della Costruzione del Consiglio Nazionale delle Ricerche
> >> Construction Technologies Institute of the National Research Council
> >> www.itc.cnr.it
> >> via Lombardia, 49
> >> 20098 San Giuliano Milanese (MI), Italy
> >> tel +39 02 9806 215
> >> fax +39 02 9828 0088
> >> e.mail r.lollini@xxxxxxxxxx
> >>
> >>
> >>
> >>
> >> 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
> >
> >
> >
> >
> >
>
> --
> ___________________________________________________________________________________
> ITC-CNR
> Istituto per le Tecnologie della Costruzione del Consiglio Nazionale delle Ricerche
> Construction Technologies Institute of the National Research Council
> www.itc.cnr.it
> via Lombardia, 49
> 20098 San Giuliano Milanese (MI), Italy
> tel +39 02 9806 215
> fax +39 02 9828 0088
> e.mail r.lollini@xxxxxxxxxx
>
>
>
>
> 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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