- #1
yossup
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Homework Statement
Suppose the insulating qualities of the wall of a house come mainly from a 4.0-in. layer of brick and an R-19 layer of insulation, as shown in the figure. What is the total rate of heat loss through such a wall, if its total area is 190ft^2 and the temperature difference across it is 10F?
Homework Equations
dQ/dt = -kA dT/dx
The Attempt at a Solution
uh...so i don't know the thermal conductivity of "r-19" (w/e that is) and it says the temperature difference across both the brick and the r-19 layer is 10F which baffles me on how to solve this problem. :(