Question 8.Q.13: How much heat is radiated from a surface 1.5 ft × 1.9 ft if ......
How much heat is radiated from a surface 1.5 ft × 1.9 ft if the surface temperatures is 125°F? The air temperature is 74°F and the radiation constant for the surface is 0.19 × 10^{−8} BTU/h ft²°F^{4}?
Step-by-Step
Q= 15 × 19 × 0.19 × 10^{-8}\left\{{(125 + 460)^{4} − (74 + 460)^{4}}\right\} = 0.5415 × 10^{-8} (11.712 − 8.131)10^{10}
Q = 194 BTU/h
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