A series composite wall of a furnace consists of 20 cm of fire brick (thermal conductivity 1.4 W/m-K), 10 cm of insulating material (0.22 W/m-K), 10 cm of ordinary brick (0.90 W/m-K), and 10 cm of asbestos cement board (0.39 W/m-K). The inside of the furnace wall is 560C and temperature of the outside wall is 80C. The heat transfer rate through the wall per area is most nearly:

A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.