A shell-and-tube heat exchanger is to heat 10,000 kg/hr of water from 16 oC to 84 oC by hot engine oil flowing through the shell. The oil makes a single shell pass, entering at 160 oC and leaving at 94 oC, with an average heat transfer coefficient of 400 W/m2K. The water flows through 11 brass tubes of 22.9 mm inside diameter and 25.4 mm outside diameter, with each tube making 4 passes through the shell. Required:
a. Assuming fully developed flow determine the required tube length per pass.
b. For the tube length found in part (1), plot the effectiveness, fluid outlet temperatures, and water-side convection coefficient as a function of water flow rate for 5000 <=15,000 kg/h, with all other conditions remaining the same.

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

Assuming compressible flow of air and that the measurements are done at flagstaff a pitot static tube that gives the difference of total and static pressure measures 0.35 m of mercury. what is the velocity of air? assume the temperature to be 300k. (submit your excel or matlab calculation sheet)

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?