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Water flows at 112°C through a steel pipe (k=90 W/m °C) which has a 6 cm...

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Mechanical Engineering

Water flows at 112°C through a steel pipe (k=90 W/m °C) whichhas a 6 cm inside diameter and 8cm outside diameter. Such that, hi=346 W/m2 °C and ho =6.0 W/m2 °C. Surrounding air temperature is20°C. To reduce heat loss to the surroundings the pipe is coveredwith an insulation insulation having the thickness of 4.0 mm andk=0,5W/m°C . Calculate;
a.    The heat loss by convection per unit length fromthe bare pipe (before insulation).
b.    The heat loss from the insulated pipe,
c. The critical radius. And discuss the result.

Answer & Explanation Solved by verified expert
3.8 Ratings (535 Votes)
a The heat loss by convection per unit length fromthe bare pipe before insulation 1355 Wb The heat loss from the insulated pipe 1418 Wc The critical radius 00833 mresults discussionWe know that adding more insulation to a wall always decreasesheat transfer The thicker the    See Answer
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