Ask Your Question

1

How to define fully opaque shades?

energyplus
shading
cooling-load
retag add tags

Hi,

I modelled two scenarios with fully opaque shades (the first with five facade shades and the second with only one shade at 40 degrees). I expected to have the same cooling energy. But the first scenario in Zone A is 424 kWh, while the second one is 478 kWh. Why are the results different for one shade above another shade? They should be the same. image description

Thanks, Berrak

asked 2023-05-18 04:51:27 -0500, updated 2023-05-19 01:19:41 -0500

edit flag offensive 0 remove flag close merge delete

Comments

@Berrak it looks like your image didn't attach correctly. Can you please try to attach the image again?

Aaron Boranian (2023-05-18 08:34:36 -0500) edit

Hi @aaron, Thank you for your reply. I have edited the image. I think you can see it now.

Berrak (2023-05-19 01:23:49 -0500) edit

add a comment see more comments

1 Answer

Sort by

1

Not a definitive answer - yet possibly an answer.

Assuming you're using EnergyPlus (although comparable engines would likely behave similarly), differences in results could come from reduced solar-ground reflections in Scenario 1. Both sky and beam solar contributions, diffusively reflected from the ground towards receiving surfaces, are diminished (vs Scenario 2). You could look into detailed output, or simply tweak the site ground reflectance for a quick assessment.

Denis Bourgeois

answered 2023-05-21 16:17:34 -0500, updated 2023-05-21 16:58:28 -0500

edit flag offensive 0 remove flag delete link

Comments

add a comment see more comments