[EnergyPlus_Support] Internal Windows

["dan_grunbaum" <dan_grunbaum@xxxxxxxxx>]

Hi

Just wanted to elaborate a little on my previous question. 
I am attempting to model a commercial building which has a glazed 
atrium surrounding it. It is intended for the office space to open to 
the atrium or there may be a glazing layer sperating the office and 
the atrium and therefore I need solar radiation to transmit from the 
exterior, through the atrium and into the office space. 

If I model this with no partition seperating the atrium and office 
space, the office space receives no solar radiation (using a solar 
distribution of full exterior and interior). I have therefore tried 
to model the partion with glass attached which is nearly 100% 
transparent for all wavelengths and highly conductive. I am assuming 
that internal windows seperating zones need to be specified twice for 
the same reason that partitions seperating zones need to be.

While this allows solar penetration, on a hot day the temperature of 
the glass assigned to the partition of the atrium is a lot hoter than 
the temperature of the corresponding glass associated with the office 
space (41 degrees compared to 29 degrees. at this time the atrium is 
at 47 and the office space is being conditioned to 24). As the glass 
is theoretically one layer, I would have expected there temperatures 
to be close or the same due to the conductivity of glass. 

This is resulting in a much lower cooling load for the office than 
expected.

Am I modelling this scenario wrongly or is EP unable to model it 
correctly.

Cheers,

Dan




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