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Author Question: A slab of concrete and an insulating board are in thermal contact with each other. The temperatures ... (Read 318 times)

corkyiscool3328

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on: Jul 28, 2018
A slab of concrete and an insulating board are in thermal contact with each other. The temperatures of their outer surfaces are 68F and 50F. 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

Question 2

The R value of fiberglass batting, 3.5 inches thick, is 11 ft2/F/h/BTU. What is the thermal conductivity (in BTU/ft/F/s)?
 a. 7.4  106
  b. 2.7  102
  c. 8.9  105
  d. 1.4  104
  e. 3.6  103


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gabrielle_lawrence

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Reply #1 on: Jul 28, 2018
Answer to Question 1

d

Answer to Question 2

a


corkyiscool3328

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  • Posts: 539
Reply 2 on: Jul 28, 2018
YES! Correct, THANKS for helping me on my review

alvinum

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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