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Heat of freezing ?
02-26-2015, 05:47 AM
Post: #4
RE: Heat of freezing ?
After Gary (ITC) valuable consultation, I can proudly say that the Flir "Tools +" amazing "local parameters" feature - finaly helped me understand strange anomalies in the IR picture.
   
What we can see the "colder", actually is warmer (-3C) than what we see as "warmer" (actually -5C). And it is mainly because of varying emissivity : roofing sheet (polyester coating, e = 0.6) and Frost (e = 0.97) , at Tref=-50C.
What I thought : the frost settles directly from water vapor (desublimation) giving off heat, which for some time (temporarily !) even more increases the temperature as seen in IR. (but it is only for transit time - then picture stabilises on what we see here).


Thank You Gary, for invaluable help !

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Messages In This Thread
Heat of freezing ? - Wieslaw - 02-19-2015, 09:48 AM
RE: Heat of freezing ? - Gary Orlove - 02-19-2015, 11:03 AM
RE: Heat of freezing ? - Wieslaw - 02-19-2015, 11:27 AM
RE: Heat of freezing ? - Wieslaw - 02-26-2015 05:47 AM

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