Determine the rate of net heat gain (or loss) through a 9-ft-high, 15-ft-wide, fixed -in s...

Determine the rate of net heat gain (or loss) through a 9-ft-high, 15-ft-wide, fixed -in single-glass window with aluminum frames on the west wall at 3 pm solar time during a typical day in January at a location near 40° N latitude when the indoor and outdoor temperatures are 70°F and 20°F, respectively.