It is desired to air-condition a small one-room store located onthe first floor of a building several stories in height. The storeis 20' wide and 40' deep, and the ceiling height is 12'.The frontwall, which faces north, may be condidered as 100% glass. Thepartitions between this store and the stores on either side are 4\"cinder tile, platered on both sides; and the rear wall, whichcontains 40 sq ft of glass, is of 4\" brickbacked by 8\" concreteblocks with furred metal lath and plaster on the inside surface.The floor construction consists of a 6\" concrete slab with 1/8\"asphalt tile flooring laid directly on the conconcrete. There is noceiling in the basement. The store ceiling constructin consists ofa 3\" concrete slab with a suspended metal-lath and plaster ceilingbelow the supporting steel joist, and a double wood floor onsleepers above the slab. The store is to be kept at 80F and 50%relative humidity when the outside temperature is 95F and therelative humidity is 50%. The stores on either side are notairconditioned, nor are the offices on the floor above. Thetemperature in the basement may be assumed to be 7 1/2 deg warmerthan the store. Assume that there will be an average of 20 personsin the store and that about 2,000 watts of fluorescent lightingwill be used.

What are the coefficients of heat transmission for walls,ceiling, floor, and partitions?

Calculate the sensible heat gain of the store described . Do notinclude infiltration.

For the same store, find the number of pounds of fresh airneeded per minute if 75% of the air is recirculated and 25% isfresh air.

Compute the number of tons of refrigeration required toair-condition the store.