In an ice-making plant, water at o'c is frozen at atmospheric pressure by evaporating saeated r-134a liquid at -16c. the refrigerant leaves this evaporator as a satu- rated vapor, and the plant is sized to produce ice at 0'c at a rate of 2500 kg/h. determine the rate of entropy generation in this plant.

Aturning operation is performed with following conditions: rake angle of 12°, a feed of 0.35 mm/rev, and a depth of cut of 1.1 mm. the work piece is aluminum alloy 6061 with t6 heat treatment (a16061-t6). the resultant chip thickness was measured to be 1.0 mm. estimate the cutting force, fc. use shear stress of 207 mpa and coefficient of friction on the tool face of 0.6.