CHG 2314 Midterm: CHG 2314 MidtermWinter04
31 Jan 2019
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Do any 2 problems; the exam will be marked out of 20. Two identical spherical reactors are insulated with different materials. 10 cm layer of fused silica (k1 = 1. 38 w/m k). The inner and outer surface temperatures of the silica insulation are 85oc and 35oc, respectively. The second reactor is covered with an 8 cm thick layer of borosilicate (k2 = 1. 09 w/m k), and the temperature drop across the borosilicate insulation is 55oc. If both reactors are in the same environment (te1 = te2 = 25oc) with the same outside heat transfer coefficient (ho1 = ho2), what are the inner and outer surface temperatures of the borosilicate insulation? (10) problem 2. Consider two slender rods of the same length and diameter but different materials. One end of each rod is attached to a base surface maintained at 100oc, while the surface of the rods are exposed to ambient air at.
