Thermal Envelopes – Part 2 Quiz

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1. According to the lesson, R-value is:
- A. The resistance to heat flow through a material
- B. The rate of heat flow in Btu/h through one square foot when there is a 1 degree F temperature difference (US units)
- C. The “overall heat transfer coefficient”
- D. Both B and C
2. Use the conductive heat flow equation to determine Q across a 500 ft2 wall with combined insulation level of R-19 where inside temperature is 70ºF and outside is 40ºF.Q = U x A x ∆T
- 9,500 Btu/hr
- 789 Btu/hr
- 285,000 Btu/hr
- 1,842 Btu/hr

1. According to the lesson, R-value is: