20 cm dia, 1.2 m long cylinder loses heat from its periphery surface by convection. Surface temperature is constant at 100°C and the field temperature is constant at 20°C. The average convection heat...

20 cm dia, 1.2 m long cylinder loses heat from its periphery surface by convection. Surface temperature is constant at 100°C and the field temperature is constant at 20°C. The average convection heat transfer coefficient over the surface of the cylinder is 20W/m2K. The heat transfer.

(a) 120 ir W                         (b) 240K W

(c) 320 ir W                          (d) 480K W