Question

A one-dimensional slab without heat generation has a thickness of 20 mm with surfaces main- tained at temperatures of 275 K and 325 K. Determine the heat flux through the system if it is constructed from (a) pure aluminum, (b) AISI 316 stainless steel, and (c) concrete.

Answer 1

Answer:

a) 512.5 KW/m2

b) 40.75 KW/m2

c) 2 KW/m2

Explanation:

Given data;

T_2 = 325 K

T_1 = 275 K

dx = 0.20 mm

a) for aluminium   K = 205 W/m k

heat flux $= k \frac{dt}{dx}$

               $= 205 \frac{325 - 275}{0.02}$

               = 512.5 KW/m2

b) for AISI 316 stainless steel

k = 16.3 W/ m k

heat flux $= k \frac{dt}{dx}$

               $= 16.3 \frac{325 - 275}{0.02}$

               = 40.75 KW/m2

C) for Concrete

k = 0.8 W/ m k

heat flux $= k \frac{dt}{dx}$

               $= 0.8 \times \frac{325 - 275}{0.02}$

               = 2 KW/m2