Question: Consider a thin 2 4 - cm - long and 2 0 - cm - wide horizontal plate suspended in air at 2 0 C

Consider a thin

24 -

-

long and

20 -

-

wide horizontal plate suspended in air at

20

.

The plate is equipped with elec

-

tric resistance heating elements with a rating of

20

.

Now the heater is turned on and the plate temperature rises. Determine the temperature of the plate when steady operating conditions are reached. The plate has an emissivity of

0.90,

and the sur

-

rounding surfaces are at

17

.

As an initial guess, assume a surface temperature of

50

.

Is this a good assumption?

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