12 71 Square Plates Freshly Sprayed With An Epoxy Paint Must Be Cured At 140 C For An Extended Period Of Time The Plate 1 (221.47 KiB) Viewed 31 times
12.71 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 by a bank of infrared lamps. The top surface of each plate has an emissivity of E = 0.8 and experiences convection with a ventilation airstream that is at T = 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 awal = 0.7. = Ventilation airstream Enclosure -Lamp Th To, h = Anta Giamp Painted plate
(a) Determine the irradiation that must be provided by the lamps, Glamp. The absorptivity of the plate sur- face for this irradiation is Clamp = 0.6. (b) For convection coefficients of h = 15, 20, and 30 W/m².K, plot the lamp irradiation, Glamp, as a function of the plate temperature, Ty, for 100 T, < 300°C. (c) For convection coefficients in the range from 10 to 30 W/m². K and a lamp irradiation of Glamp = 3000 W/m², plot the airstream temperature To required to maintain the plate at T, = 140°C. =
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