A long wire 0 03 inches in diameter with an emissivity of 0 9 is placed in a large quiescent air space at 20 F If the wire is at 1000 F, calculate the net rate of heat loss Discuss your assumptions GIVENLong wire in still airWire diameter (D) 0 03 in Wire temperature (Ts) 1000 F 1460 REmissivity () 0 9Air temperature (T ) 20 F 480 RASSUMPTIONSThe enclosure around the wire behaves as a blackbody enclosure at the temperature of the airThe natural convection heat transfer coefficient is 3 Btu (h ft2 F) (From Table 1 4)Steady state conditionsprevail T 480 R Wire Surface Temp (T) 1460 R Length L

Question: A long wire 0.03 inches in diameter with an emissivity of 0.9 is placed in a large quiescent air space at 20?F. If the wire

A long wire 0.03 inches in diameter with an emissivity of 0.9 is placed in a large quiescent air space at 20?F. If the wire is at 1000?F, calculate the net rate of heat loss. Discuss your assumptions.GIVENLong wire in still airWire diameter (D) = 0.03 in.Wire temperature (Ts) = 1000?F = 1460 REmissivity (ε) = 0.9Air temperature (T??) = 20?F = 480 RASSUMPTIONSThe enclosure around the wire behaves as a blackbody enclosure at the temperature of the airThe natural convection heat transfer coefficient is 3 Btu/(h ft2 ?F) (From Table 1.4)Steady state conditionsprevail

T.= 480 R Wire Surface Temp (T) = 1460 R Length - L

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