Ashell-and-tube heat exchanger with two shell passes and eight tube passes exchanges heat between water and hot air. the air flows in the shell, entering with a temperature of 350°c and leaves the heat exchanger at 175°c. water flows in the tubes at the rate of 45,500 kg/hr., entering with a temperature of 80°c and leaving at 150°c. the total surface area for the heat exchange is 925 m2. if the specific heat of water is 4,236 j/kg °c, calculate the overall heat transfer coefficient.

Agas contained within a piston-cylinder assembly e end nation about same energy states, 1 and 2, where pi 10 bar, v undergoes two processes, a and b, between the sam 0.1 m3, ui-400 kj and p2 1 bar, v2 1.0 m2, u2 200 kj: process a: process from 1 to 2 during which the pressure- volume relation is pv constant process b: constant-volume process from state 1 to a pressure of 2 bar, followed by a linear pressure-volume process to +20 0 state 2 kinetic and potential energy effects can be ignored. for each of the processes a and b, (a) sketch the process on p-v coordinates, (b) evaluate the work, in kj, and (c) evaluate process the heat transfer, in kj