HEAT TRANSFER SHOW SOLUTION 5. The roof of an electrically heated home is 6 m long, 8 m wide, and 0.25 m thick, and is made of a flat layer of concrete whose thermal conductivity is k 0.8 W/m · °C .The temperatures of the inner and the outer surfaces of the roof one night are measured to be 15°C and 4°C, respectively, for a period of 10 hours. Determine (a) the rate of heat loss through the roof that night b. heat flux though the roof a. 35.21 W/m2, 1690 W b. 1690 W, 35.21 W/m2 c. 1960 W, 53.21 W/m2
HEAT TRANSFER SHOW SOLUTION 5. The roof of an electrically heated home is 6 m long, 8 m wide, and 0.25 m thick, and is made of a flat layer of concrete whose thermal conductivity is k 0.8 W/m · °C .The temperatures of the inner and the outer surfaces of the roof one night are measured to be 15°C and 4°C, respectively, for a period of 10 hours. Determine (a) the rate of heat loss through the roof that night b. heat flux though the roof a. 35.21 W/m2, 1690 W b. 1690 W, 35.21 W/m2 c. 1960 W, 53.21 W/m2
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HEAT TRANSFER
SHOW SOLUTION
5. The roof of an electrically heated home is 6 m long, 8 m wide, and 0.25 m thick, and is made of a flat layer of concrete whose thermal conductivity is k 0.8 W/m · °C .The temperatures of the inner and the outer surfaces of the roof one night are measured to be 15°C and 4°C, respectively, for a period of 10 hours. Determine (a) the rate of heat loss through the roof that night b. heat flux though the roof
a. 35.21 W/m2, 1690 W
b. 1690 W, 35.21 W/m2
c. 1960 W, 53.21 W/m2
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