ASHRAE 189.1, 8.4.1.2 requires us to have permanent shading devices. We are attempting to achieve the Daylighting credit 8.1. For the prescriptive method, does an interior or exterior shading device affect the sidelighting daylight zone of a window?

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TODD REED

Energy Program Specialist

PA DMVA

LEEDuser Expert

626 thumbs up

Mon, 09/12/2011 - 17:19

An interior shading device, such as light shelf or even a baffle would effect the window height. An interior light shelf is an interruption in the window head height, You would have to actually do tow zones for a space, one for the view window and and one for the daylight window. You would actually have a dead area in the zone if correctly using the formula, There is nothing that states that exterior shading devices must be considered with the prescriptive method. Simulation would be easier.

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