Slat thermal conductivity issue

asked 2021-11-13 02:48:33 -0600

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.)?
Aaron Boranian gravatar image Aaron Boranian  ( 2021-11-16 16:27:18 -0600 )edit