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Simple shading control in EnergyPlus

asked 2015-12-21 09:15:21 -0500

gerald's avatar

updated 2017-05-17 12:25:46 -0500

I want to model a simple shading control (input 0-1) - what would be a proper way to implement this in EnergyPlus: Do I need an object: WindowProperty: Shading Control? If so, it is possible to implement this without a "shading-layer"? Regarding shadingType: Are there differencens in the results If i use Interior/Exterior shades/blindes/screens? Thank you very much for your help

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answered 2015-12-21 10:36:22 -0500

You can look over the Shading Surfaces section of the Input/Output Reference for more info, but to give short answers to your questions:

NOTE: This object DOES NOT interact with the FenestrationSurface:Detailed object to model complex windows. You can define your window using individual glazing and gas material layers in a normal Construction object, model simple windows, or use EMS variables to control shades if you must keep the complex windows.

NOTE: The shading control will be applied to ALL windows with the construction you enter. If you only want want to implement shading control on specific windows, or look at different shading control strategies (setpoints, schedules, blind placement, etc.) across multiple windows in the same simulation, you will need to create multiple window constructions in your model.

  • Yes, you should see different results based on shading device placement and type. The shading device will still block direct light penetration through windows depending upon transmittance, but exterior devices will block solar radiation gains on the exterior window surface while interior devices will not. Also, there are some subtle differences between shades / blinds / and screens in EnergyPlus. For example, shades are perfect diffusers while reflective properties of blinds vary according to solar angle of incidence. The impacts these options have will depend upon your model (building use, location, operation schedule, etc.), so you'll have to test them out to see what impacts they have.
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Hello, i have a window material shade defined and i would like to associate/connect with the fenestration surface detailed. In a previous versions of energyplus, the FenestrationSurface:Detailed has a field called "Shading Control Name" which" has the possibility to make that association. But the new version don't have it. How can we make that association?

Thank you vey much. Ricardo

RicardoCordeiro's avatar RicardoCordeiro  ( 2021-09-08 06:41:13 -0500 )edit

@RicardoCordeiro that input field has now moved to the WindowShadingControl object referencing the fenestration surface object (and zone name) where the shade is applied.

Aaron Boranian's avatar Aaron Boranian  ( 2021-09-09 09:19:13 -0500 )edit

Hello again. So it's enough to have the field "Zone Name" filled? Because in the fields "Fenestration Surface Name" i don't have space to put all the surfaces. I filled just the first field, which i supose is mandatory. Thanks

RicardoCordeiro's avatar RicardoCordeiro  ( 2021-09-10 04:04:35 -0500 )edit

Hello again. did you understood my question? Thanks for your atention. Ricardo

RicardoCordeiro's avatar RicardoCordeiro  ( 2021-09-14 08:22:54 -0500 )edit

@RicardoCordeiro no, you need to set both the Zone Name and the Fenestration Surface Name(s). From the docs, "This Fenestration Surface Name(s) field can be repeated to apply the same shading control to more than one fenestration surface."

The WindowTests.idf example file that comes with EnergyPlus has an example WindowShadingControl object controlling 4 window surfaces in one zone.

Aaron Boranian's avatar Aaron Boranian  ( 2021-09-14 09:27:54 -0500 )edit

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Asked: 2015-12-21 09:15:21 -0500

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Last updated: Sep 08 '21