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Is the OnIfHighSolarOnWindow shading control type too low to be useful?

This value seems to be un-editable in the OpenStudio interface and does not seem to even appear in the .osm file (?). The value can be found in the .idf file. Here it is expressed as 27 (presumably W/m2). Which means that anytime incident solar radiation is greater than 27 W/m2, shades, blinds, or darker glazing are deployed. At this threshold how is this useful? Minimum radiation during daylit hours on East, South, and West facades in most locales are substantially higher than this, meaning that shades may as well be scheduled to be down during the day and up at night. Am I missing something? Are the units not actually W/m2?

Thanks!

Is the OnIfHighSolarOnWindow shading control type too low to be useful?

This value seems to be un-editable in the OpenStudio interface and does not seem to even appear in the .osm file (?). The value can be found in the .idf file. Here it is expressed as 27 (presumably W/m2). Which means that anytime incident solar radiation is greater than 27 W/m2, shades, blinds, or darker glazing are deployed. At this threshold how is this useful? Minimum radiation during daylit hours on East, South, and West facades in most locales are substantially higher than this, meaning that shades may as well be scheduled to be down during the day and up at night. Am I missing something? Are the units not actually W/m2?

Thanks! image description