The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m2. The flux, when the element temperature is increased to 1000°C for the same furnace temperature is_____________________?
Correct answer: D. 16.5 kW/m2
- A. 11.2 kW/m2
- B. 12.0 kW/m2
- C. 14.6 kW/m2
- D. 16.5 kW/m2
Explanation
For the same furnace temperature, net radiation varies as T_element⁴ − T_furnace⁴, with temperatures in kelvin. Using 1073 K, 1273 K and 573 K gives a flux of approximately 16.5 kW/m².
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