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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
12.91 Square plates freshly sprayed with an epoxy paint must be cured at 140°C for an extended period of time.
The plates are located in a large enclosure and heated A B
by a bank of infrared lamps. The top surface of each
plate has an emissivity of s = 0.8 and experiences
0.2
0
0 2 4 6 8 10
l (mm)
convection with a ventilation airstream that is at T00 = 27°C and provides a convection coefficient of h = 20 W/m2 · K. The irradiation from the enclosure walls is estimated to be Gwall = 450 W/m2, for which the plate absorptivity is awall = 0.7.
(a) Calculate the absorptivity of the sample.
(b) Calculate the emissivity of the sample.
(c) Determine the heat removal rate (W) by the coolant.
(d) The ratio of the radiation in the A direction to that in the B direction will give the reflectivity of the sample. Briefly explain why this is so.
Ventilation
airstream
T¥, h
Enclosure
Lamp
Glamp
Painted plate
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