Change in results between version then using a ComplexShade

asked 2022-06-14 06:38:46 -0500

rn's avatar

updated 2022-06-14 08:31:37 -0500

I have a question regarding a change in results from running the same .idf in EnergyPlus version 8.9 vs. version 22.1.0. I discovered the difference then I tried to update the file to the newest version. Though some testing has, I found that change happening after version 9.0.1, which means it is probably a change in that update. Furthermore, did I test several .idf files with different window construction where I noticed that the big difference in results is only happening, then I use a BSDF Complexshade. I read in the changelog for version 9.0.1 that "BSDF Venetian Blinds - Add option for vertical blinds and correct surface emissivity calculation" has been updated, but as my BSDF that describes my shading layer is not a Venetian Blind. Therefore I can not figure out that could be the reason for my change in results?

My Window construction is directly outputted from LBNL Window, and the shading layer is thin foil between the window layers. I have runned an example file in in version 8.9.0 and version 22.1, with the same idf: https://microshade-my.sharepoint.com/...

The change in results:

################# 22.1 ########################################

Zone Ideal Loads Supply Air Total Cooling Energy (Yearly) - kWh : 677.8121545

Zone Ideal Loads Supply Air Total Heating Energy (Yearly) - kWh : 404.2115521

Peak Cooling load : 718.794587

Peak Heating load : 1316.366508

################# 8.9.0

Zone Ideal Loads Supply Air Total Cooling Energy (Yearly) - kWh : 591.8406828

Zone Ideal Loads Supply Air Total Heating Energy (Yearly) - kWh : 194.2980343

Peak Cooling load : 1197.342589

Peak Heating load : 606.8653816

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