Question

1. Saturated steam at 4 bars absolute pressure with a mean velocity of 3 m/s flows through a horizontal SS304 stainless-steel pipe whose inner and outer diameters are 55 and 65 mm, respectively. The heat

asked Apr 22, 2021 38.2k views

1. Saturated steam at 4 bars absolute pressure with a mean velocity of 3 m/s flows through a horizontal SS304 stainless-steel pipe whose inner and outer diameters are 55 and 65 mm, respectively. The heat transfer coefficient for the steam flow is known to be 11,000 W/m2 -K. (a) If the pipe is covered with a 25-mm-thick layer of 85% magnesia insulation and is exposed to atmospheric air at 25°C in cross-flow with U[infinity]=15 m/s, determine the rate of heat transfer by forced convection to the room per unit length of the pipe. (b) If the steam is saturated at the inlet of the pipe, estimate its quality at the outlet of a pipe 30m long. (c) Determine the temperature of the outer surface of the insulation. Is it safe to touch?