Ahigh temperature muffle furnace uses a composite wall of three materials to manage heat transfer. inside the furnace, the air temperature is 800°c and the convection coefficient is 25 w/m2∙k. the inside surface temperature is 600°c. next, layer a has a thickness of 0.30 m and a conductivity of 20 w/m∙k. layer b has a thickness of 0.15 m. layer c has a thickness of 0.15 m and a conductivity of 50 w/m∙k. the outer surface temperature at steady state is 20°c. using an energy balance and a thermal circuit, determine the thermal conductivity of layer b.

Agas contained within a piston-cylinder assembly e end nation about same energy states, 1 and 2, where pi 10 bar, v undergoes two processes, a and b, between the sam 0.1 m3, ui-400 kj and p2 1 bar, v2 1.0 m2, u2 200 kj: process a: process from 1 to 2 during which the pressure- volume relation is pv constant process b: constant-volume process from state 1 to a pressure of 2 bar, followed by a linear pressure-volume process to +20 0 state 2 kinetic and potential energy effects can be ignored. for each of the processes a and b, (a) sketch the process on p-v coordinates, (b) evaluate the work, in kj, and (c) evaluate process the heat transfer, in kj