CHG 2314 Midterm: CHG 2314 MidtermSummer04
31 Jan 2019
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Do any 2 problems; the exam will be marked out of 20. Water at 50oc is passed through a pipe having thermal conductivity of 0. 17 w/m k. the internal and external diameters of the pipe are 5 and 7 cm, respectively. The pipe is located in the environment at. If the resistances to the internal and external convection are negligible, determine the rate of heat loss per unit length of the pipe. An electrical current is passed trough a horizontal copper wire 1 mm in diameter and 30 cm long, located in an air stream at 20oc. For the copper wire take: k = 386 w/m k and the electrical resistance per unit length, r = 5. 467 x 10-3. The volumetric rate of heat generation resulting from passing of the electrical current, qv/l = i2. R, where i is the electrical current in amperes. A stainless steel ball, which is initially at 10oc, passes through an oven maintained at 300oc.
