Note: The ASME document may not describe the coating used at Ivanpah. However, I read an article about the glass there some time ago that said it has some similar coating. It resembles Teflon. Water and dust do not easily adhere to it; they blow right off again.
I wish they would invent something like that for eye glasses. The ASME document describes heat transfer fluid and many other aspects of CSP that are at the cutting edge, and that may be useful in other technology. - Jed
