An insulated frame wall of a house has an average thermal conductivity of 0.0318 Btu/h-ft^2-R degrees. The wall is 6 in thick and it has an area of 160 ft^2. The inside air temperature is 70 degrees F and the heat transfer coefficient for convection between the inside air and the wall is 1.5 Btu/h-ft^2-R degrees.
On the outside of the wall, the convection heat transfer coefficient is 6 Btu/h-ft^2-R degrees and the air temperature is -10 degrees F. Ignoring radiation, determine the rate of heat transfer through the wall at steady-state in Btu/h