Your boss has been tracking cost of construction. He created cost index to track these costs. Costs during the first year of the index were $8 per square foot of space and the index value was set for 00 for that first year. Past year survey costs were $120 per square foot. What index number will your boss publish in his report for this year? If we are then told that the index value was 925 last year, what was the cost per square foot last year?

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.