****I hope that the solution is written on the computer and not written so that I can transfer it and understand it more quickly A composite wall of a refrigerator consists of three different materials; A, B, and C. Two of the used materials have known thermal conductivity, kA = 30 W/m. K and kC=45 W/m. K, and known thickness, LA=0.20 m and LC = 0.15 m. The third material, B, which is sandwiched between materials A and C, is of known thickness, LB = 0.15 m, but unknown thermal conductivity kB. Under steady-state operating conditions, measurements reveal an outer surface temperature of Ts,o = 20°C, an inner surface temperature of Ts,i = 600°C, and a refrigerator air temperature of T∞ = 800°C. The inside convection coefficient h is known to be 25 W/m2 .K. (a) First, draw the thermal circuit for this wall. (b) What is the value of thermal conductivity for material B?
****I hope that the solution is written on the computer and not written so that I can transfer it and understand it more quickly
A composite wall of a refrigerator consists of three different materials; A, B, and C. Two of the used
materials have known thermal conductivity, kA = 30 W/m. K and kC=45 W/m. K, and known thickness,
LA=0.20 m and LC = 0.15 m. The third material, B, which is sandwiched between materials A and C, is of
known thickness, LB = 0.15 m, but unknown thermal conductivity kB. Under steady-state operating
conditions, measurements reveal an outer surface temperature of Ts,o = 20°C, an inner surface temperature of
Ts,i = 600°C, and a refrigerator air temperature of T∞ = 800°C. The inside convection coefficient h is known
to be 25 W/m2
.K. (a) First, draw the thermal circuit for this wall. (b) What is the value of thermal
conductivity for material B?
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