If the R-value of a wall is 10 ft2-˚F-hr/Btu, then the rate of heat transfer through a 2 ft - 3 ft section of wall, with $\Delta$T = 50 $\degree$F, will be:
A) 10
B) 30
C) 500
D) 3000
E) 10,000 Btu/hr

Question

Quizplus · Accepted Answer

The rate of heat transfer through a wall is given by the formula Q = (A * ΔT) / R, where Q is the heat transfer rate in Btu/hr, A is the area of the wall in square feet, ΔT is the temperature difference across the wall in degrees Fahrenheit, and R is the R-value of the wall in ft^2-˚F-hr/Btu. Here, A = 2 ft * 3 ft = 6 ft^2, ΔT = 50°F, and R = 10 ft^2-˚F-hr/Btu. Plugging these values into the formula gives Q = (6 * 50) / 10 = 300 / 10 = 30 Btu/hr.

If the R-Value of a Wall Is 10 Ft2-˚F-Hr/Btu, Then Δ\DeltaΔ

If the R-Value of a Wall Is 10 Ft2-˚F-Hr/Btu, Then $\Delta$