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Engineering · Mechanical Engineering
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2.26
(2.24) A stream of ethylene glycol having a flow rate of 1.6kg/s is to be cooled from 350 to 310K by pumping it through a 3-cm ID tube, the wall of which will be maintained at a temperature of 300 K. What length of tubing will be required? Ans. 49 m. (2.25) A small steam superheater will be made of3 in. schedule 80 stainless steel pipe which will be exposed to hot flue gas from a boiler. 50lbm/h of saturated steam at 320 will enter the pipe and be heated to 380°F Assuming that the pipe wall temperature will vary from 375 F at the steam inlet to 415 F at the outlet, calculate the length of pipe required for the superheater. Ans. 6.1 ft. CONVECTIVE HEAT TRANSFER 2179 (2.26 Suppose that the steam superheater of Problem 2.25 has a length of 10 ft and the wall temperature is constant at 415°F over the entire length of the pipe. Using the value of the heat-transfer coefficient calculated in Problem 2.24, estimate the temperature of the steam leaving the superheater. Ans. 405 E
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