In a ship with a main engine of 8000 kW 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 as 2 stages - 2 stages of plate separation. When the body diameter is 150 cm, the inner pipe diameter is 10 mm, the inner pipe wall thickness is 2 mm and the body length is 3 meters, NOT: 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) When calculating the convection coefficient, ignore the area blocked by the internal pipes for the area on the body side. (Cpsu 4.18 kJ/kg.K, Cphava 1.006 kJ/kg.K, Kicboru 385 W/mK, k-0.65 W/mK, Knava=0.026 W/mK 1, Prsu 6.7, Prnava 0.7, Hsu 8.9 x 10, Air 1.85 x10s Pa.s, Psu-997 kg/m3, Pnava1.25 kg/m3