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class 36 - Radiation Exchange Between Surfaces Click to...

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Click to edit Master subtitle style Radiation Exchange Between Surfaces: Chapter 13 Last lecture
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A cylindrical furnace for heat-treating materials in a spacecraft environment has a 90-mm diameter and an overall length of 180 mm. Heating elements in the 135-mm long section (1) maintain a refractory lining of ε = 0.8 at 800oC. The linings for the bottom (2) and upper(3) sections are made of the same refractory material but are insulated. What is the power required to maintain the furnace operating conditions with the surroundings at 23oC? ( 29 ( 29 1 1 1 / N i j bi i j i i i i ij J J E J A A F ε ε - = - - = -
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How many radiation balances can you make? a) 1 b) 2 c) 3 d) 4
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A cylindrical furnace for heat-treating materials in a spacecraft environment has a 90-mm diameter and an overall length of 180 mm. Heating elements in the 135-mm long section (1) maintain a refractory lining of ε = 0.8 at 800oC. The linings for the bottom (2) and upper(3) sections are made of the same refractory material but are insulated. What is the power required to maintain the furnace operating conditions with the surroundings at 23oC?
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What is q2?
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