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the critical radius of insulation for this value of r c. Calculate the heat loss per m of pipe and the outer surface temperature. Neglect the resistance of the pipe material. Given N Ü 2 = 10 2 = 5 I= 0.05 I N 4 1 2 = 11 2 = 5.5 I= 0.055 I k =1 W/mK T i = 200 oC T ∞ =20 o C h 0 =8 W/m 2K Find (i) r c (ii) If r c =r o then Q/L

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Jan 02 2017 · 9. A 5-mm-diameter spherical ball at 50°C is covered by a 1-mm-thick plastic insulation (k 0.13 W/m · °C). The ball is exposed to a medium at 15°C with a combined convection and radiation heat transfer coefficient of 20 W/m2· °C. Determine if the plastic insulation on the ball will help or hurt heat transfer from the ball. 6.

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