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[EnergyPlus_Support] View Factors

I am modeling a small interior room with no windows--so no additional 
irradiation enters the space, and I have specified no thermal mass in the 
space.  I look at the calculation method for radiation exchange and appears to 
be an energy balance between all the surface.  I would expect from an energy 
balance that the heat transfer from some wall would be negative and some to be 
positive and, therefore, from a first law balance assuming steady-state 
conditions, the total heat exchange due to radiation would sum to zero.  
However, I have found that radiation exchange varies significantly (for this 
size of space) when I alter the thermal absorbtance.  Perhaps I am misinformed 
and am completely missing an assumption or not factoring in additional elements 
used in the algorithm, but how can this be?

Thanks in advance,
Peter Loutzenhiser

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