Steam enters the condenser of a steam power plant at 30 kpa, a quality of 91 % and a mass flow rate (m˙) of 301 kg/min . it leaves the condenser as saturated liquid at 30 kpa. it is to be cooled with water from a nearby river by circulating the water through the tubes within the condenser. to prevent thermal pollution, the river water is not allowed to be heated to a temperature above 5 ∘c. determine the entropy generation rate (sgen) in the heat exchanger.

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.

Slip occurs via two partial dislocations because of (a) the shorter path of the partial dislocation lines; (b) the lower energy state through partial dislocations; (c) the charge balance.

Atmospheric air has a temperature (dry bulb) of 80° f and a wet bulb temperature of 60° f when the barometric pressure is 14.696 psia. determine the specific humidity, grains/lb dry air. a. 11.4 c. 55.8 d. 22.5 b. 44.1