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A feed of 8350 kg/h of a 20 wt% NaOH solution in water at 37.8°C enters continuously a single-effect evaporator to a product of 50 wt% NaOH solution. The evaporation is at a pressure of 7.384 kPa (abs). The heat transfer area is 42 m?. Saturated steam at 270.1 kPa (abs) is supplied for heating. (vapour heat capacity is 1.884 kJ/kg/K). (i) Calculate the heat transfer coefficient and the steam economy. (ii) For all other operation conditions remain unchanged and the heat transfer coefficient is constant, if the evaporation pressure is increased, what will the evaporator size change? (iii) For all other operation conditions remain unchanged and the heat transfer coefficient is constant, if the steam pressure is increased, what will the evaporator size change?

A feed of 8350 kg/h of a 20 wt% NaOH solution in water at 37.8°C enters continuously a single-effect evaporator to a product of 50 wt% NaOH solution. The evaporation is at a pressure of 7.384 kPa (abs). The heat transfer area is 42 m?. Saturated steam at 270.1 kPa (abs) is supplied for heating. (vapour heat capacity is 1.884 kJ/kg/K). (i) Calculate the heat transfer coefficient and the steam economy. (ii) For all other operation conditions remain unchanged and the heat transfer coefficient is constant, if the evaporation pressure is increased, what will the evaporator size change? (iii) For all other operation conditions remain unchanged and the heat transfer coefficient is constant, if the steam pressure is increased, what will the evaporator size change?

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Question 3 A feed of 8350 kg/h of a 20 wt% NaOH solution in water at 37.8°C enters continuously a single-effect evaporator to a product of 50 wt% NaOH solution. The evaporation is at a pressure of 7.384 kPa (abs). The heat transfer area is 42 m2. Saturated steam at 270.1 kPa (abs) is supplied for heating. (vapour heat capacity is 1.884 kJ/kg/K). (i) Calculate the heat transfer coefficient and the steam economy. (ii) For all other operation conditions remain unchanged and the heat transfer coefficient is constant, if the evaporation pressure is increased, what will the evaporator size change? (iii) For all other operation conditions remain unchanged and the heat transfer coefficient is constant, if the steam pressure is increased, what will the evaporator size change?
Transcribed Image Text:Question 3 A feed of 8350 kg/h of a 20 wt% NaOH solution in water at 37.8°C enters continuously a single-effect evaporator to a product of 50 wt% NaOH solution. The evaporation is at a pressure of 7.384 kPa (abs). The heat transfer area is 42 m2. Saturated steam at 270.1 kPa (abs) is supplied for heating. (vapour heat capacity is 1.884 kJ/kg/K). (i) Calculate the heat transfer coefficient and the steam economy. (ii) For all other operation conditions remain unchanged and the heat transfer coefficient is constant, if the evaporation pressure is increased, what will the evaporator size change? (iii) For all other operation conditions remain unchanged and the heat transfer coefficient is constant, if the steam pressure is increased, what will the evaporator size change?
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