Problem # 2 Exam 1 Process Heuristics and Developing Flowsheets

# Problem # 2 Exam 1 Process Heuristics and Developing Flowsheets

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Print Name:___________________________________________ Problem # 2 (15%) Process Heuristics (1) (2%) What is the inlet temperature in o F to assume for cooling water used for cooling or condensing a process stream? (2) (2%) Generally for most systems operating at ambient to several hundred o C, is it better to compress a gas/vapor from a lower pressure to a higher one, or to condense the gas to a liquid, pressure the liquid with a pump and then re-vaporize the liquid to a gas/vapor? (3) (2%) For a shell and tube heat exchanger operating nominally in the temperature range of 200 to 250 o F, what it’s the suggested minimum approach temperature, i.e. tube in – shell out or tube out – shell in , in o F for the heat exchanger? (4) (2%) What type of distillation column is recommended for separations involving corrosive

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Unformatted text preview: constituents? (5) (2%) For liquid flow in a pipe, what is the rule of thumb P in psi, to assume across a control valve? (6) (5%) Specify the preferred rule of thumb for a low cost shell and tube heat exchanger configuration, i.e. x-y, where x is the number of shell passes and y is the number of tube passes, for a heat exchanger in which a hot stream entering at 300 o F will be cooled to 210 o F by a cold stream entering at 200 o F and leaving at 245 o F. Show all work. Use the figures on the next page; R and S factors are as follows: R = (T hot in T hot out )/(T cold out T cold in ); T is in o F S = (T cold out T cold in )/( T hot in T cold in ); T in o F Print N ame:___ _______ _______ ________ _______ _______ _____...
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## This note was uploaded on 11/14/2011 for the course CHEN 4520 taught by Professor Wiemer during the Fall '11 term at Colorado.

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Problem # 2 Exam 1 Process Heuristics and Developing Flowsheets

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