Question: P 3 - 8 An L - shaped extrusion made of aluminum alloy 2 0 2 4 - T 6 is well insulated on all

3 - 8

An L

-

shaped extrusion made of aluminum alloy

2024 -

6

is well insulated on all sides, as shown in the figure. Heat flows

by radiation with the night sky

,

which is at

- 40 C .

Air at

- 10 C

flows over the top of the plate, cooling it with a heat transfer coefficient of

42 \frac{W}{m^{2}} * K .

The plate is insulated on its underside and heated by an electric resistance heater. How much electric power must be supplied to maintain the plate at

55 C ?

P 3 - 8 An L - shaped extrusion made of aluminum

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