(Solved): 3.45 3-45 A sphere of outside diameter D=10cm maintained at a uniform temperature Ti=225C is ...
3.45
3-45 A sphere of outside diameter D=10cm maintained at a uniform temperature Ti?=225?C is exposed to an ambient at T??=25?C with a heat transfer coefficient for convection of h=50W/(m2??C). Calculate the thickness of the insulation [k=0.08W/(m??C)] required to reduce the rate of heat loss by 83 percent while the sphere is maintained at Ti?=225?C. Answer: 0.5cm