Aheat exchanger receives a "hot side" 1 kg/s flow of combustion gases with an inlet temperature of 600°c and an outlet temperature of 400°c. the "cold" side flow is compressed air with a mass flow rate of 0.5 kg/s and an inlet temperature of 200°c. assuming room temperature specific heats and an adiabatic heat exchanger, find the rate of heat transfer between the two flows 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.