A 30 x 8 ft wall consists of 4 in of face brick (150 lb/ft), in of cement mortar, 8 in. hollow clay tile, an airspace 1% in wide, and wood lath and plaster totaling 4 in. (a) Find the U-factors for both winter and summer (b) Estimate the heat loss and gain from the wall assuming a location in Chicago, IL. Assume the inside condition design at 72 F.