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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

Ok, but if i have like 20 windows... the space fields doesn't allows me to put all the window surfaces there, right? Beacause i only have 10 Fenestraion Surface Names versus 20 windows. (It's a single familiy house with just one zone). Is possible to put prints here? It's easier to explain, maybe. Thanks

RicardoCordeiro's avatar RicardoCordeiro  ( 2021-09-14 09:49:48 -0500 )edit

@RicardoCordeiro If you are limited to 10 fenestration surface references with each WindowShadingControl object, then you can make multiple WindowShadingControl objects where all input fields are the same EXCEPT the window shading control name and name of the fenestration surfaces that are controlled (assuming they are all controlled with the same approach/strategy).

Aaron Boranian's avatar Aaron Boranian  ( 2021-09-14 10:20:43 -0500 )edit

You are actually not limited to 10 fenestration surfaces (typically FenestrationSurface:Detailed names) within the WindowShadingControl object for EnergyPlus, you can add more if you want. If you are using a text editor to edit your IDF file, you can just keep adding more fenestration input objects at the end of the object since it is "extensible." If you are using IDF Editor you will need to edit the Energy+.idd file to show additional fields (copy the field A23 in the Energy+.idd file for WindowShadingControl for as many fields as you need and make sure it ends with a semicolon).

JasonGlazer's avatar JasonGlazer  ( 2021-09-14 11:37:18 -0500 )edit

First of all thanks everyone for your help. I have a little pratice with the program, so all the help is wellcome.

@JasonGlazer i've tried using the text editor, adding more fields but when i opened the energy + idf file, a message apears, telling me that: "Too many field of object window shading control... This error maybe caused by a missing semi-colon at the end of an object..." (which i checked and real have the semi-colon). And these message appears for each field i've added (its 4 more field that i need). So, can you tell me, please, exactly how can i add more fields. Thanks again.

RicardoCordeiro's avatar RicardoCordeiro  ( 2021-09-15 11:39:51 -0500 )edit

@JasonGlazer, is it possible to meet you at some chat, or have your email, or something like that? Just beacuse i think it's easier to share prints which are better to understand/explain.

RicardoCordeiro's avatar RicardoCordeiro  ( 2021-09-15 11:42:15 -0500 )edit

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

Seen: 2,573 times

Last updated: Sep 08 '21