Slat thermal conductivity issue

asked 2021-11-13 02:48:33 -0500

updated 2022-02-22 18:00:16 -0500

i am using design builder to simulate exterior window shading. the shading type is a slat type that is designed to be vertical with no gaps in between.

once i input lower thermal conductivity (w/m-k), for instance 0.005 it gives worse results than the a higher material with higher thermal conductivity, for example 1.00 w/m-k.

is this a built in problem within design builder ?

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Comments

@Abdullah zong we need more information to provide better help:

location or weather file
how much of the windows use the exterior slat shades
what directions the windows face (North, South, East, West)
is conductivity the only input that changed (could have also changed reflectance/absorptance properties)?
what results are "worse" for the higher-conductivity case (total annual energy, annual heating/cooling energy, etc.)?