Consider steady heat transfer between two large parallel plates at constant temperatures of t1 = 210 k and t2 = 150 k that are l = 2 cm apart. assume that the surfaces are black (emissivity ε = 1). determine the rate of heat transfer between the plates per unit surface area assuming the gap between the plates is filled with atmospheric air.

Explanation:

Given that

Emissivity of surfaces(∈) = 1

We know that heat transfer between two surfaces due to radiation ,when both surfaces are black bodies

So now by putting the values

So rate of heat transfer per unit area

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answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg