(Solved): SULIT (MMJ32603) Question 1 (Soalan 1] (a) What is the driving force for heat transfer, electric cu ...

SULIT (MMJ32603) Question 1 (Soalan 1] (a) What is the driving force for heat transfer, electric current flow and fluid flow? Apakah daya (3 Marks/ Markah) (b) Consider a 30 cm long, 10 cm wide and 0.5 cm thick plate (Figure 1) made of a sample material whose thermal conductivity is equal to 15 W/m-K. The top surface of the plate is exposed to the ambient of 20°C. The bottom surface of the plate is connected to a 1200 W resistance heater. The bottom surface of the resistance heater is assumed as adiabatic surface and no heat loss by radiation. [Pertimbangkan plat 30 cm panjang, 10 cm lebar dan 0.5 cm tebal (Gambarajah 1) yang diperbuat daripada bahan contoh yang keberkondukan haba bersamaan dengan 15 W/m-K. Permukaan atas plat terdedah kepada ambien 20°C. Permukaan bawah plat disambungkan kepada pemanas rintangan 1200 W. Permukaan bawah pemanas rintangan diandaikan sebagai permukaan adiabatik dan tiada kehilangan haba oleh sinaran.] i) Sketch the thermal resistance network for heat transfer through the plate. [Lakarkan rangkaian rintangan haba untuk pemindahan haba melalui plat tersebut.]. (4 Marks/ Markah) ii) Derive the general solution for temperature distribution in the plate. [Terbitkan selesaian am untuk taburan suhu dalam plat tersebut.] (8 Marks/ Markah) 111) If the coefficient associated with free convection heat transfer from the surface to the ambient is 80 W/m²-K, determine the temperatures at the bottom and top surfaces of the plate. [Jika pekali yang berkaitan dengan pemindahan haba perolakan bebas dari permukaan ke ambien ialah 80 W/m² K, tentukan suhu di permukaan bawah dan permukaan atas plat tersebut.] (5 Marks/ Markah) T?-20°C h Convection Plate L-0.5cm Resistance heater 1200 W (Gamb Figure 1 Lu 30 cm