Question

A large plane wall has a thickness L = 50 cm and thermal conductivity k = 25W/m·K. On the left surface (x = 0), it is subjected to a uniform heat flux ?̇₀ while the surface temperature T₀ is constant. On the right surface, it experiences convection and radiation heat transfer while the surface temperature is TL = 225°C and the surrounding temperature is 25°C. The emissivity and the convection heat transfer coefficient on the right surface are 0.7 and 15 W/m² ·K, respectively.

2-2) Calculate the heat flux ?̇₀ on the left face of the wall.

a) 5430 W/m²

b) 3340 W/m²

c) 4780 W/m²

d) 6220 W/m²

e) 6110 W/m²

f) 5130 W/m²

2-3) Determine the temperature of the left surface of the wall at x = 0.

a) T₀ = 320 °C

b) T₀ = 328 °C

c) T₀ = 336 °C

d) T₀ = 344 °C

e) T₀ = 346 °C

f) T₀ = 356 °C

Answer 1