The wall of an industrial furnace is constructed from 0.15-m-thick, fireclay brick having a thermal conductivity of lz w/m. k. measurements made during steady state operation reveal temperatures of 1400 and 1150 k at the inner and outer sur- faces, respectively. what is the rate of teat loss through a wall that is 0.5 m by 1.2 m on a side?

it means there are 3 atoms of oxygen

the correct answer would be d. hope this !

the answer is c

tell me if wrong

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.