daylighting controls and arrows
So, I am continuing to try to figure out how to use daylighting controls. In a particular, I am running one model with and another without daylighting controls in each exterior windowed zone. I created the one with form the one without by using the "Add Daylight Sensor at the Center of Space" measure. By the the way, that alone was not sufficient, I then also had to manually add illuminance maps for each daylighting controlled zone, because OpenStudio would show an error without them - is that intended behavior?
Anyway, it turns out, with an Illuminance Setpoint of 45 fc, I use MORE electricity with daylighting controls than without daylighting controls, and I am puzzled by that. My windows have U-0.7, SHGC-0.25 and VT-0.275, so granted there is not much daylight to begin with. Also, my Minimum Light Output Fraction is 0.2, with a Minimum Input Power Fraction of 0.3. Furthermore, I have selected Continuous/Off for the Lighting Control Type, plus 1 as the Number of Stepped Control Steps, 1 as the Probability Lighting will be Reset and 1 as the Number of Daylighting Views.
Any thoughts on why daylighting controls might cause more energy usage in this scenario?
Furthermore, I noticed that the daylighting controls in the SketchUp plugin have little arrows associated with them. Is there a particular direction these arrows should point in - towards the windows, perhaps? Could misaligned daylighting controls be the reason for the above observations?
