the composite pipe of 5m long are covered with double layers of insulators and used for pumping heated fruit puree of 85 celcius in a room at 23 celcius. The ID and OD of the pipe is 5cm and 5.4cm, respectively. The thickness of insulator A is 5.3cm and that of insulator B is 1cm. Thermal conductivities of the pipe, and insulator A and B are 45, 0.0389 and 0.0228 W/mK respectively. The heat transfer coefficient on the inner surface of the pipe is 100 W/m^2K while that on the outer surface of layered pipe is 5 W/m^2K. Calculate the rate of heat transfer.