compressed air system
1) A production line uses 10 copper tubes with nominal diameters of 1/8-inch and inside diameters of 0.125 inch to blow moisture off a product. Air-saver nozzles that consume 10 scfm of compressed air are found to perform just as well as the open tubes. Calculate the annual cost savings from installing air-saver nozzles on the open tubes. Assume the compressed air pressure is 100 psig at the tubes and ambient pressure is 15 psia.
2) Six 1/16-inch air leaks are identified in the compressed air system. Calculate the annual cost savings from fixing these leaks. Assume the compressed air pressure is 100 psig at the leaks and ambient pressure is 15 psia.
3) The average current draw of the three-phase compressor operating at 480 V is 88 A per leg when loaded and 53 A per leg when unloaded. The power factor remains constant at 84%. The compressor control panel reports a total runtime of 10,832 hours and loaded runtime of 4,126 hours. The temperature outside air temperature is 35 F and the temperature in the compressor room is 55 F. The average annual outdoor air temperature in Dayton is 50 F. Assuming that the temperature difference between the compressor room and outside air stays constant, calculate the annual cost savings from compressing outside air instead of inside air.