Acompany would like to evaluate two incentive schemes that take effect once the worker exceeds standard performance. in the first case the benefits are split 30% to the worker and 70% to the company up to 120% performance. if the worker exceeds 120% performance, all of the earnings go to the worker. in the second case, all earnings beyond standard performance are split 50/50 between the worker and the company.

a. plot the earnings for each scheme.
b. derive the equations for worker earnings and normalized unit labor costs for each scheme

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?