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An electric heater with the total surface area of 0 25 m2 and emissivity 0 75 is in a room where the air has a temperature of 20°C and the walls are at 10°C When the heater consumes 500 W of electric

An electric heater with the total surface area of 0.25 m2 and emissivity 0.75 is in a room where the air has a temperature of 20°C and the walls are at 10°C. When the heater consumes 500 W of electric power, its surface has a steady temperature of 120°C. Determine the temperature of the heater surface when it consumes 700 W. Solve the problem

(a) assuming negligible radiation and

(b) taking radiation into consideration. Based on your results, comment on the assumption made in part (a).

 

 

 

Jul 22 2020 View more View Less

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