Homework #5

Questions:

The following refer to the book Introduction to Chemical Engineering: Tools for Today and Tomorrow (5th Edition).

1. Reading Question 1 from Chapter 10 on page 185

2. Homework Problem 5 from Chapter 10 on page 186

3. Homework Problem 7 from Chapter 10 on page 186

   Do this problem first ‘by hand’. Then, write a function with the following signature:

   function [conv_hot, cond, conv_cool] = calc_resistances(ri, ro)

   where

   • conv_hot is the fraction of the total resistance attributable to convective heat transfer resistance for the hot fluid

   • cond is the fraction of the total resistance attributable to conductive heat transfer resistance in the tube wall

   • conv_cold is the fraction of the total resistance attributable to convective heat transfer resistance for the cold fluid

   • ri is the inner tube diameter

   • ro is the outer tube diameter

   Test your function with your answer from the ‘by hand’ analysis.

4. Consider the manufacture of xylenes case study beginning on page 221.

   Find the following:

   1. the rate \((\si{lb_{m}/hr})\) at which saturated steam must be supplied to the first heat exchanger

   2. the rate \((\si{lb_{m}/hr})\) at which saturated steam must be supplied to the jacket around the reactor to maintain the reactor contents at constant temperature.

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Review your responses to all of the homework questions before class so that you are prepared for the quiz on Tuesday!