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Re: [EnergyPlus_Support] The question about the internal thermal m ass
1. No, the air volume is not adjusted. If you want to reduce the capacitance
of the zone air, change the volume in the ZONE object. But the contribution of
air mass is very tiny compared to the thermal mass of surfaces, so this should
produce negligible changes in results.
2. The only limit on internal mass area is that the radiant heat transfer
calculations require that any one surface must have an area less than or equal
to the sum of all other surfaces in the same zone. You can have multiple
internal mass objects in the same zone.
3. In your intial post, you stated "I know this thermal mass only consider the
convection heat transfer with zone air." This is incorrect. Internal mass
surfaces participate fully in all zone heat transfer mechanisms, including
convection with the zone air, thermal radiant (receiving radiant internal gains
and exchanging with other surfaces), and solar gains (diffuse, and direct if
the solar distribution is set to MinimalShadowing). It is just like a regular
heat transfer surface except that is has no geometric position in the zone.
Mike
On 30 Jan 2007 at 8:35, wanglei wrote:
>
> Dear Linda
> Thank you very much for your reply.
> I have two question about the internal mass.
> 1. If I add a thermal mass in a zone , the volume of the air is subtract by this thermal mass
> 2. what is the maximum thermal mass area, which I can input to the area field.
> Thank you ,verymuch!
>
>
>
>
> From: "Linda Lawrie" <linda@xxxxxxxxxx>
> To: energyplus_support@xxxxxxxxxxxxxxx
> Date: Mon, 29 Jan 2007 23:04:22 +0800 (CST)
> Subject: Re: [EnergyPlus_Support] The question about the internal thermal m ass
>
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>
>
>
> Remember that the internal mass will absorb heat and retain that
> temperature. "when I increasing the area of thermal mass above 50, <BR>the average temperature is high than less thermal mass. I think there <BR>is some problem." -- I would be looking at the significance of area
> "50" is with the rest of your zone.
>
> A more definitive answer will come if you upload your input file to
> the support group area.
>
> Linda
>
> EnergyPlus WebSite: http://www.energyplus.gov
> Owner: EnergyPlus_Support list
> Member: EnergyPlus Development Team
>
> [Non-text portions of this message have been removed]
>
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> [Non-text portions of this message have been removed]
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> 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.
>
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>
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>
>
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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