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Saturated steam at a gauge pressure of 2.0 bar is to be

Elementary Principles of Chemical Processes | 3rd Edition | ISBN: 9780471687573 | Authors: Richard M Felder ISBN: 9780471687573 143

Solution for problem 7.28 Chapter 7

Elementary Principles of Chemical Processes | 3rd Edition

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Elementary Principles of Chemical Processes | 3rd Edition | ISBN: 9780471687573 | Authors: Richard M Felder

Elementary Principles of Chemical Processes | 3rd Edition

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Problem 7.28

Saturated steam at a gauge pressure of 2.0 bar is to be used to heat a stream of ethane. The ethane enters a heat exchanger at 16C and 1.5 bar gauge at a rate of 795 m3/min and is heated at constant pressure to 93C. The steam condenses and leaves the exchanger as a liquid at 27e. The specific enthalpy of ethane at the given pressure is 941 kJ/kg at 16C and 1073 kJ/kg at 93C. (a) How much energy (kW) must be transferred to the ethane to heat it from 16C to 93C? (b) Assuming that all the energy transferred from the steam goes to heat the ethane, at what rate in m3/s must steam be supplied to the exchanger? If the assumption is incorrect, would the calculated value be too high or too low? (c) Should the heat exchanger be set up for cocurrent or countercurrent flow (see the following schematic diagram)? Explain. (Hint: Remember that heat always flows from a higher temperature to a lower temperature.)

Step-by-Step Solution:

Problem 7.28Saturated steam at a gauge pressure of 2.0 bar is to be used to heat a stream of ethane. The 3ethane enters a heat exchanger at 16°C and 1.5 bar gauge at a rate of 795 m /min and isheated at constant pressure to 93°C. The steam condenses and leaves the exchanger as aliquid at 27e. The specific enthalpy of ethane at the given pressure is 941 kJ/kg at 16°Cand 1,073 kJ/kg at 93C. (a) How much energy (kW) must be transferred to the ethane to heat it from 16C to 93°C(b) Assuming that all the energy transferred from the steam goes to heat the ethane, atwhat rate in m3/s must steam be supplied to the exchanger If the assumption is incorrect,would the calculated value be too high or too low(c) Should the heat exchanger be set up for concurrent or countercurrent flow (see thefollowing schematic diagram) Explain. (Hint: Remember that heat always flows from ahigher temperature to a lower temperature.) Step-by-step solutionStep 1 of 4Steam is a common material used in heat exchangers since water is cheap. Steam has known lowcorrosive properties, and can easily be released into the environment. Since steam is a commonmaterial, the thermal properties can easily be found in steam tables.This problem uses steam to heat a stream of ethane in a heat exchanger and also discusses thedifference between concurrent and countercurrent flows.The hot steam enters through the same side along with the cold ethane in concurrent flow, whileit enters through the exit of hot ethane in concurrent flow.

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Chapter 7, Problem 7.28 is Solved
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Textbook: Elementary Principles of Chemical Processes
Edition: 3
Author: Richard M Felder
ISBN: 9780471687573

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