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Re: [EnergyPlus_Support] Re: Internal Partitions do not participate in blocking solar radiation?



You gotta be careful, as those stacked interior surfaces could be "double-counting" the solar radiation, and thus exaggerating the load in the space.  I gave a presentation in Dallas at ASHRAE which touched on this for a different application, though I am unable to access those files right now.  For my specific work I had to modify the source to block some surfaces.  Perhaps some other users have better workarounds.

Edwin


On Fri, Jun 14, 2013 at 1:11 PM, Niraj Poudel <nirajpdl@xxxxxxxxx> wrote:
 

Attached is a portion of the plot for the west wall.

On Fri, Jun 14, 2013 at 3:09 PM, Niraj Poudel <nirajpdl@xxxxxxxxx> wrote:
Dear All,

I am testing the placement of PCM in specific locations inside a room. So in that process I am placing partitions in front of a particular wall (equipped with PCM) to test to see is it is the direct beam solar radiation that is melting the PCM as opposed to conduction + convection effects. Now in that process I developed a 35' X 35' building and placed an interior partition (with boundary condition set to adiabatic) through the center of the room and then placed an additional partition dividing the room in 4 cubicles. So now I have 3.idf files.

a) No Partition
b) With 1 partition
c) With 2 partitions

The output I requested was "Surface Inside Face Exterior Windows Incident Beam Solar Radiation Rate per Area [W/m2]" for each wall. Now when I plot the results for say west wall 1 (i.e a portion of west wall) I get this:


All the cases receive the same amount of beam solar radiation through the windows. Shouldnt the interior partition block the beam radiation from reaching the west surface?

P 198. Engineering Reference states that:
"Note however, DElight does not account for interior surface obstructions (e.g., partitions) in this initial interior illuminance/luminance distribution."

Is this the case for beam solar radiation as well? Any thoughts or comments will be appreciated.

Sincerely yours'
Niraj
--
Niraj Poudel, Architectural Engineer.
PhD student, PDBE Program.
Clemson University, Clemson, SC.




--
Niraj Poudel, Architectural Engineer.
PhD student, PDBE Program.
Clemson University, Clemson, SC.




--
Edwin Lee, PhD
Engineer, Commercial Buildings Research Staff
National Renewable Energy Laboratory



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