The sun protection profile is only effective in rooms with windows that have sun protection. This can be entered separately for each window under Building Data. Here the sun protection control for the individual zones is defined separately. The following three operating modes are available for sun protection control:
- Automatic (default) - in this mode the sunshade will close automatically if the solar radiation entering the room through the window exceeds the entered threshold. The threshold value is entered in W/m², so the sun protection profile can be used for different windows (or rooms). The threshold value for the activation of the sun protection can be entered in W/m² as well as in Lux.
- Manual - the sunshade closes according to the daily profile, the threshold is not used. If you want the sun protection to close in the respective hour, activate the corresponding checkbox. The diagram bar is also displayed. So if the bar is displayed, the sunshade is closed in this hour
- Open (no sun protection) - Sun protection is always open or missing
If the sun protection is open, most of the solar radiation enters the room and has a delayed effect. If the sun protection is closed, only a small part of the solar radiation enters the room. The amount of solar radiation entering the room depends on the window type when the sun protection is open and on the window type and the type of sun protection when the sun protection is closed. The amount of solar radiation entering the room determines the criterion used for automatic lighting control. If the lighting control is set to "Automatic On/Off", the lighting is switched on as soon as too little solar radiation enters the room. Therefore, if the sunshade is closed, this will in most cases cause the lighting to switch on, provided that it is in Automatic On/Off mode. However, if a room has several windows, the sunlight can enter the room through another window (e.g. in another outside wall). In this case it is not mandatory that the lighting is switched on. When evaluating the solar load caused by the solar radiation in the room, it should not be forgotten that the threshold value is a relative, area-related quantity.
Example
A window has a surface of 2m², the solar radiation is 150W/m², the threshold is 200W/m² (solar losses are neglected). The resulting solar load is then 300W; the solar protection is still open. The solar shading will only close when the resulting solar load exceeds 400W (2m²*200W/m²).