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Homework_2_Solution

# Homework_2_Solution - 1-61 An electric thermofoil heater is...

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1-61 An electric thermofoil heater is sandwiched between two identical rectangular samples of the same material. The top and bottom are insulated, and the heater reaches steady operation. The temperature drop across each sample is given. The thermal conductivity of the material at the average temperature of the material is to be determined. Assumptions Steady operating conditions exist. There is no heat transfer through the insulated regions. There is thermal symmetry laterally. Known = = = = Δ 2 . o m 01 . 0 m 005 0 W 25 C 8 A . L W T e Unknown k Q , . Property Relations & Laws W 5 . 12 W) 25 ( 2 1 2 1 . . = = = e W Q Conclusion This number makes sense based on the ratios. The problem is similar to example 1-6 in Çengel. C W/m 78 0 o = = Δ = Δ = . C) 8 )( m 01 . 0 ( ) m 005 . 0 ( W) 5 . 12 ( o 2 . . T A L Q k L T kA Q

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0.3 m 1.7 m . Q 0.3 m 1-117 A standing man is modeled as a vertical cylinder insulated at the top and bottom. The rate of heat loss for the man is to be determined for two different convection heat transfer coefficients. The wind chill factor is to be determined for the second convection heat transfer coefficient. Assumptions
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Homework_2_Solution - 1-61 An electric thermofoil heater is...

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