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A fluid at a temperature T$\infty_1$, with a heat transfer coefficient h1 flows on one side of a slab at  x = 0 and another fluid at a temperature T$\infty_2$ with a heat transfer coefficient h2 flows on the other side of the slab at x = L. Both the fluids flow in opposite directions. Develop an expression for the heat flow Q through an area ‘A’ of the slab.

Calculate the heat transfer rate through an area of one square metre of the slab for the following data:

T$\infty_1$= 1500 C, h1 = 300 W/m2 K, T$\infty_2$ = 500 C.

H2 = 600 W/m2 K, thickness of slab = 5 cm and K = 20 W/m K.

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