[EnergyPlus_Support] Evaluation Sunshading device

["sofie_mols" <sofie_mols@xxxxxxxxxxx>]

Hello everyone,

I am doing research on sunshading devices and I am facing some
problems. I have developed a preprocessor that builds a solar shading
device with slats using the Surface:Shading:Attached model to define
the slats as individual surfaces. I would like to compare the results
of my sunshading with the results I get from the Material:Window:Blind
object to simulate venetian blinds. All the dimensions in both objects
are similar, yet the inside temperatures resulting from the two models
differ 1 to even 2°C. Running through the engineering reference I
can't really find what causes this difference:

1.could it be that in the Surface:Shading:Attached model the surfaces
are subdevided in multiple nodes to calculate the reflections, so the
reflections from this model are more accurate as the ones from
Material:Window:Blind?

2. In the Material:Window:Blind object E+ takes the air gap between
the solar shading and the glass into account, which causes a
convection airflow and results in higher solar gains and this is not
the case in the Surface:Shading:Attached model?

Thanks in advance for your help!

Sofie Mols



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