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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 in of fiberglass, has R = 40 ft2 °F h/BTU. (a) Determine the thermal resistance in SI units. m2 K/W (b) Find the heat flow per square meter through a wall that has insulation with an R factor of 40, with an outside temperature of ?33 °C and an inside temperature of 20 °C. W/m^2

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