In a ship with a main engine of 8000 kW power and 30% thermal efficiency, 60% of the total waste heat is discharged through the chimney. It is desired to obtain hot water at 80 C from the exhaust gas. Distilled water is taken into the boiler at a temperature of 30 C. The main engine exhaust gas outlet temperature is 600 C and the chimney atmosphere outlet temperature is 220 C. The boiler working order is considered to be 2 passes - 2 stages of plate separation. Considering the body diameter as 150 cm, the inner pipe diameter 10 mm, the inner pipe wall thickness as 2 mm and the body length as 3 meters, a) Find the total heat transfer amount .b) Find the total heat transfer coefficient.. c) Find the number of pipes to be used. (2 passes = 1 pipe).