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Consider the cylindrical 012 m diameter radiation shield of Example 9 5 that is installed concentric with a 010 m diameter tube carrying steam The spacing provides an air gap of

Consider the cylindrical, 0.12-m-diameter radiation shield of Example 9.5 that is installed concentric with a 0.10-m-diameter tube carrying steam. The spacing provides an air gap of L = 10 mm.

 

(a) Calculate the heat loss per unit length of the tube by convection when a second shield of 0.14-m diameter is installed, with the second shield maintained at 35°C. Compare the result to that for the single shield of the example.

(b) In the two-shield configuration of part (a), the air gaps formed by the annular concentric tubes are L = 10 mm. Calculate the heat loss per unit length if the gap dimension is L = 15 mm. Do you expect the heat loss to increase or decrease?

Jul 23 2020 View more View Less

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