A heat exchanger is operated to heat water entering the tubes with two shell passes and 23 tube passes at 3 kg/s and 14 °C. The exhaust oil enters the shell at 3 kg/s and 200 °C. Determine the rate of heat transfer using (1) the LMTD method and (2) NTU method. The heat capacity for the water and oil are 4180 and 2200 J/kg·K, respectively. The overall heat transfer coefficient and surface area of tube are 300 W/m2 ·K and 20 m2

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.