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4. Hot combustion gases (Cp = 0.63 kcal/kg-°C) at 850 °C are to be used to heat water from 25°C to saturated steam at 165°C. The mass flow rate of water is 45 kg/h. Heat transfer coefficients kcal/m²-hr-°C): gas, forced convection 55; water, forced convection 300; water, boiling 2800. AH, = 530 kcal/kg • Find the minimum flow rate of combustion gases. Hint: assume countercurrent • Find the required area of the heat exchanger for a flow rate 45% above this value Hint: heat transfer coefficient of steam is 20 kcal/m2-hr-°C

4. Hot combustion gases (Cp = 0.63 kcal/kg-°C) at 850 °C are to be used to heat water from 25°C to saturated steam at 165°C. The mass flow rate of water is 45 kg/h. Heat transfer coefficients kcal/m²-hr-°C): gas, forced convection 55; water, forced convection 300; water, boiling 2800. AH, = 530 kcal/kg • Find the minimum flow rate of combustion gases. Hint: assume countercurrent • Find the required area of the heat exchanger for a flow rate 45% above this value Hint: heat transfer coefficient of steam is 20 kcal/m2-hr-°C

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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4. Hot combustion gases (Cp = 0.63 kcal/kg-°C) at 850 °C are to be used to heat water from 25°C to saturated steam at 165°C. The mass flow rate of water is 45 kg/h. Heat transfer coefficients kcal/m²- hr-°C): gas, forced convection 55; water, forced convection 300; water, boiling 2800. AH, = 530 kcal/kg Find the minimum flow rate of combustion gases. Hint: assume countercurrent Find the required area of the heat exchanger for a flow rate 45% above this value Hint: heat transfer coefficient of steam is 20 kcal/m2-hr-°C
Transcribed Image Text:4. Hot combustion gases (Cp = 0.63 kcal/kg-°C) at 850 °C are to be used to heat water from 25°C to saturated steam at 165°C. The mass flow rate of water is 45 kg/h. Heat transfer coefficients kcal/m²- hr-°C): gas, forced convection 55; water, forced convection 300; water, boiling 2800. AH, = 530 kcal/kg Find the minimum flow rate of combustion gases. Hint: assume countercurrent Find the required area of the heat exchanger for a flow rate 45% above this value Hint: heat transfer coefficient of steam is 20 kcal/m2-hr-°C
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