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change the solar absorptance of roof outermost layer based on outdoor dry bulb temperature

I want to change the solar absorptance/reflectance of roof outermost layer based on outdoor temperature Dry bulb Condition is Solar reflectance = 0.85 for DBT >30 Solar reflectance 0.1 for DBT <30. Based on research, I've a little idea that it is to be done using EMS. But I really don't know how to use it. I've to use it on a DOE prototype strip mall building in open-studio. Any help in this regard is highly appreciated.

change the solar absorptance of roof outermost layer based on outdoor dry bulb temperature

I want to change the solar absorptance/reflectance of roof outermost layer based on outdoor temperature Dry bulb Condition is Solar reflectance = 0.85 for DBT >30 Solar reflectance 0.1 for DBT <30. Based on research, I've a little idea that it is to be done using EMS. But I really don't know how to use it. I've to use it on a DOE prototype strip mall building in open-studio. Any help in this regard is highly appreciated.