A slab of concrete and an insulating board are in thermal contact with each other. The temperatures of their outer surfaces are 68°F and 50°F. Determine the rate of heat transfer (in BTU/ft2/h) if the R values are 1.93 and 8.7 ft2/°F/h/BTU, respectively

a. 9.7
b. 2.5
c. 5.3
d. 1.7
e. 28


d

Physics & Space Science

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