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Propane gas enters a heat exchanger at 50 °C and 300 kPa and exits at 280 °C under adiabatic condition continuously. Another stream of superheated steam enters the exchanger by flowing countercurrently to the propane at 350 °C and 4 bar and exits as a saturated liquid at the same pressure. (a) Prepare a process flowchart by taking 120 mol of propane fed to the exchanger as basis. Include the labeling of volume of propane and steam fed (m³), and mass of steam fed (kg) in the flowchart. (b) Calculate values of the labeled specified enthalpies as tabulated in the following inlet-outlet enthalpy table

Propane gas enters a heat exchanger at 50 °C and 300 kPa and exits at 280 °C under adiabatic condition continuously. Another stream of superheated steam enters the exchanger by flowing countercurrently to the propane at 350 °C and 4 bar and exits as a saturated liquid at the same pressure. (a) Prepare a process flowchart by taking 120 mol of propane fed to the exchanger as basis. Include the labeling of volume of propane and steam fed (m³), and mass of steam fed (kg) in the flowchart. (b) Calculate values of the labeled specified enthalpies as tabulated in the following inlet-outlet enthalpy table

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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Propane gas enters a heat exchanger at 50 °C and 300 kPa and exits at 280 °C under adiabatic condition continuously. Another stream of superheated steam enters the exchanger by flowing countercurrently to the propane at 350 °C and 4 bar and exits as a saturated liquid at the same pressure. (a) Prepare a process flowchart by taking 120 mol of propane fed to the exchanger as basis. Include the labeling of volume of propane and steam fed (m³), and mass of steam fed (kg) in the flowchart. (b) Calculate values of the labeled specified enthalpies as tabulated in the following inlet-outlet enthalpy table. Species C3H8 H₂O References: H₂O (1, 0.01 °C), C3H8 (g, 50 °C) Ain nout Ĥ₁ (kJ/mol) A₂ (kJ/kg) 120 mol mw (kg) 120 mol mw (kg) A out ĤI3 (kJ/mol) A₁ (kJ/kg) (c) Calculate the mass feed rate of steam and volumetric feed ratio of the two streams (m³ steam fed/m³ propane fed). Assume that propane is with ideal gas behavior but not the steam. (d) Calculate the heat transferred from water to propane (kJ/m³ propane fed). (e) There is lower rate of heat transfer between propane and the steam when scale builds up on the heat transfer surface over a period. Explain the changes in the outlet streams as a result of the decrease on heat transfer.
Transcribed Image Text:Propane gas enters a heat exchanger at 50 °C and 300 kPa and exits at 280 °C under adiabatic condition continuously. Another stream of superheated steam enters the exchanger by flowing countercurrently to the propane at 350 °C and 4 bar and exits as a saturated liquid at the same pressure. (a) Prepare a process flowchart by taking 120 mol of propane fed to the exchanger as basis. Include the labeling of volume of propane and steam fed (m³), and mass of steam fed (kg) in the flowchart. (b) Calculate values of the labeled specified enthalpies as tabulated in the following inlet-outlet enthalpy table. Species C3H8 H₂O References: H₂O (1, 0.01 °C), C3H8 (g, 50 °C) Ain nout Ĥ₁ (kJ/mol) A₂ (kJ/kg) 120 mol mw (kg) 120 mol mw (kg) A out ĤI3 (kJ/mol) A₁ (kJ/kg) (c) Calculate the mass feed rate of steam and volumetric feed ratio of the two streams (m³ steam fed/m³ propane fed). Assume that propane is with ideal gas behavior but not the steam. (d) Calculate the heat transferred from water to propane (kJ/m³ propane fed). (e) There is lower rate of heat transfer between propane and the steam when scale builds up on the heat transfer surface over a period. Explain the changes in the outlet streams as a result of the decrease on heat transfer.
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