Just looking for some further clarification on this problem, found on page 131 of the Handbook:
I got this one mostly correct, except that I would have selected "Remove the low-e coating of the window glazing" instead of "Change the tint of the windows from brown to grey."
My thinking was that low-e reflects radiant solar energy, which could otherwise passively warm the building in a cold climate. Changing the tint, on the other hand, would change the design. (Plus, the savings were higher.)
Either I don't understand how low-e windows work, or I'm not "thinking ARE." (Probably both!) The explanation simply says that low-e coatings increase thermal performance. Is there something I'm missing? I thought low-e was only about thermal gains, not losses. Is it that low-e glass simply has a low U-Value? At the same time, the U-Value measures heat flow in either direction - and there's no infrared that could "leak" from the building...right?
Please clarify, this will help me understand the test much better. Thanks in advance!
Please sign in to leave a comment.