Consider a house in Atlanta, Georgia, that is maintained at 22C and has a total of 20

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Consider a house in Atlanta, Georgia, that is maintained at 22°C and has a total of 20 m2 of window area. The windows are double-door type with wood frames and metal spacers and have a U-factor of 2.5 W/m· K (see Prob. 1–125 for the definition of U-factor). The winter average temperature of Atlanta is 11.3°C. Determine the average rate of heat loss through the windows in winter.

Data From Problem 125

The rate of heat loss through a unit surface area of a window per unit temperature difference between the indoors and the outdoors is called the U-factor. The value of the U-factor ranges from about 1.25 W/m· K (or 0.22 Btu/h · ft· °F) for low-e coated, argon-filled, quadruple-pane windows to 6.25 W/m· K (or 1.1 Btu/h · ft· °F) for a single-pane window with aluminum frames. Determine the range for the rate of heat loss through a 1.2-m × 1.8-m window of a house that is maintained at 20°C when the outdoor air temperature is 28°C.

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