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Re: [EnergyPlus_Support] View Factors
The internal gain is electric equipment with no radiative component. This may
help though. I am letting the temperature float and controlling the boundary
conditions with outside surface temperatures. Would that have any impact? I
guess what I am seeing is a change in the zone temperature when adjusting the
thermal absorbtance. Does that provide enough information?
Peter
>
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> <tt>
> Are there any internal gains (people, lights, etc.) that have a radiant <BR>
> component? How are you reporting or inferring the amount of radiant
exchange. <BR>
> While it is true that the total radiant exchange should sum to zero, the <BR>
> magnitude should change. Lower absorptances become a resistance to radiant
<BR>
> heat exachange. So, I would expect to see more heat flowing from warm to
cool <BR>
> surfaces when the absorptance is high, and less flow when the absorptance is
<BR>
> low. Is that consistent with the results you are getting?<BR>
> <BR>
> Mike<BR>
> <BR>
> <BR>
> On 21 Oct 2004, at 6:46, Peter G. Loutzenhiser wrote:<BR>
> <BR>
> > <BR>
> > I am modeling a small interior room with no windows--so no additional <BR>
> > irradiation enters the space, and I have specified no thermal mass in the
<BR>
> > space. I look at the calculation method for radiation exchange and
appears to<BR>
> > be an energy balance between all the surface. I would expect from an
energy<BR>
> > balance that the heat transfer from some wall would be negative and some to
be<BR>
> > positive and, therefore, from a first law balance assuming steady-state<BR>
> > conditions, the total heat exchange due to radiation would sum to zero.
<BR>
> > However, I have found that radiation exchange varies significantly (for
this<BR>
> > size of space) when I alter the thermal absorbtance. Perhaps I am
misinformed<BR>
> > and am completely missing an assumption or not factoring in additional
elements<BR>
> > used in the algorithm, but how can this be?<BR>
> > <BR>
> > Thanks in advance,<BR>
> > Regards,<BR>
> > Peter Loutzenhiser<BR>
> > ISU <BR>
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> ========================================================<BR>
> Michael J. Witte, GARD Analytics, Inc.<BR>
> EnergyPlus Testing and Support <BR>
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