Question-4: A room in a building in New York City has a 12 ft W by 6 ft H window facing south. The building is of medium weight construction. The window is Solution We know that solar cooling load is given as QS = A (T It + NpIt) Where A is area , T is transmittivity of glass , It is total radiation incident on surface, p is absorptivity of glass , N is fraction of absorbed radiation transferred to the indoor by conduction and convection. These all are standard values on putting these values we can find the value of Q. then for load we can find out it by dividing the 3.5 which give us the value in tons. We have all the values A = 12*6 ft2.