Which step in the engineering design process did Thomas Edison apply in the following scenario? Thomas Edison improved the light bulb by designing and testing a light bulb with a filament that was much longer-lasting than the carbon filament used by Henry Woodward and Mathew Evans.

identify the problem
communicate the results
conduct background research
modify the prototype based on test results

The catalogue for a refrigerant 22, four-cylinder, hermetic compressor operating at 29 r/s. a condensing temperature of 40°c and an evaporating temperature of -4°c shows a refrigeration capacity of 115 kw. at this operating point, the motor (its efficiency is 90 percent) draws 34.5 kw. the bore of the cylinders is 87 mm and the piston stroke is 70 mm. the performance data are based on 8°c of sub-cooling of the liquid leaving the condenser. compute (a) the actual volumetric efficiency and (b) the compression efficiency.