A basement is 20 x 20 ft (6 x 6 m) and 7 ft (2.13 m) below grade. The walls have R-4.17(R-0.73) insulation on the outside. (a) Estimate the overall

heat-transfer coefficients for the walls and floor. (b) Estimate the heat loss from the basement assuming it is located in Chicago,IL. Assume a heated basement at 72 F (22 C).5-23.