[EnergyPlus_Support] Re: The question about the internal thermal m ass

["eric_zhou1223" <eric_zhou1223@xxxxxxxxx>]

Mike,

For the third question, if there is no geometric position in the 
zone, then how is the radiation with other surfaces able to be 
considered(and further the solar radiation)? I feel this calulation 
could be related to the object's place.

Eric

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
<mjwitte@...> wrote:
>
> 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@...>
> > 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
> > 
> > 
> > 
> > 
> > 
> > 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]
> > 
> >  
> > 
> > 
> > 
> > 
> > 
> > [Non-text portions of this message have been removed]
> > 
> > 
> > 
> > The primary EnergyPlus web site is found at:
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> > 
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> > 
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> > 
> 
> 
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support      
> EnergyPlus-Support@...
>




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