Comparing Solar Heat Gain Coefficients (SHGC) and Shading Coefficients (SC)

Green Building

Comparing Solar Heat Gain Coefficients (SHGC) and Shading Coefficients (SC)

Originally published on May 18, 2015 by BNP Media through the Walls & Ceilings Blog.

I was recently discussing glazing properties with a mechanical engineer for an energy model of a corporate headquarters we are working on.

We discussed U-factors first and then moved on to shading properties. We had this awkward moment where he asked me what the shading coefficients were.

“You mean the solar heat gain coefficients?”

“No, the shading coefficients,” he responded.

This caught me off guard. He couldn’t care less about my solar heat gain coefficient values at that particular moment.

But this is not an issue of semantics. It actually brings up a point of confusion among design and construction professionals. While the solar heat gain coefficient and the shading coefficient address the same concept, they are significantly different.

Read more…