The R factor for housing insulation gives the thermal resistance in units of ft2 °F h/btu. A good wall for harsh climates, corresponding to about 10.0 in of fiberglass, has R = 40.0 ft2 °F h/btu.
a) Determine the thermal resistance in SI units.
b) Find the heat flow per square meter through a wall that has insulation with an R factor of 40.0, with an outside temperature of -22.0 °C and an inside temperature of 23.0 °C.
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