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A calandria (another term for a thermosyphon reboiler, see McCabe Chapter 13) is used to vaporize...

A calandria (another term for a thermosyphon reboiler, see McCabe Chapter 13) is used to vaporize 5000 kg/hr chlorobenzene (1 atm pressure, 131oC) using 65 psia saturated steam. The heat of vaporization of chlorobenzene is 324.6 J/g. Use Table 13.2 to estimate the overall heat transfer coefficient. a) calculate the heat exchanger surface area required (m2) and b) determine the mass flow rate of steam required (kg/hr).

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Answer #1

The value of the overall heat transfer coefficient(U) has not been provided here. it is stated in the question that we should use an attached table to find out the value, but the table in question has not been provided. In case of an evaporator, we have to determine the U value either experimentally, or from charts and tables. Hence that is a vital piece of information. The solution is given in terms of variables in such a manner that if the value of U is known, then the problem can be solved simply by substituting that value into the final form for part a

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