Hello everyone

I try to understand the different control strategies and the role the sensors play within them.

Although I read some threads on this webpage about it, I have still some difficulties to understand it.

Automated thermal Control:

For this case it is assumed that the reference sensor for the system is either an internal and / or external illuminance sensor (reference: daysim.ning.com).

The external sensor is outside, the internal sensor is placed inside and looks more or less  outside the window.

Question: are the workplane sensors used to control the shading? Which sensor (workplane / reference sensor) has the authority?

In another presentation (J.A. Jakubiec, C.F. Reinhart, DIVA 2.0: integrating daylight and thermal simulations using Rhinoceros 3D, DAYSIM and EnergyPlus. Proceedings of Building Simulation 2011, Sydney.) for example there is NO external sensor defined (which would be logical to me).

Automated Glare Control

The role of the exterior sensor is to avoid glare. Are the work plane sensors used to control the shading?

Thank you for some explanations on the "mystical" sensors.

Regards

Caroline

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Hello Caroline,

Question: are the workplane sensors used to control the shading? Which sensor (workplane / reference sensor) has the authority?

In the automated thermal control mode (and every shading control type except automated glare), Daysim doesn't create a hierarchy between interior or exterior illuminance sensors. If your sensor is exterior, it is probably most important to define the lux range which activates it in a sensible fashion. This is up to your control strategy: do you keep illuminance below 2000 lx inside or do you close the blinds when there is >10000 lx on the facade? The automated thermal name comes from the ability to set a schedule where blinds are closed during unoccupied hours during the cooling period, for example. This doesn't effect the daylight results at all, but it does matter if you are importing the shading schedule into a thermal simulation program.

Automated Glare Control

The role of the exterior sensor is to avoid glare. Are the work plane sensors used to control the shading?

Yes. This is modeled on a real control system. Basically the shades close if the interior illuminance sensor is too bright OR if the sun is within the geometric range and brighter than the 'glare control threshold.'

This presentation should also be useful to you.

Best,

Alstan

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