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Example: A biomass pyrolysis reactor produces a pyrolysis vapor, which is a complex mixture of organic compounds and water. In this example, we consider an indirect contact heat exchanger for complete condensation of this vapor, with water used as cooling liquid. The vapor (containing no liquid droplets) enters the condenser at its boiling point of 380 K (assumed to be constant); it leaves the heat exchanger at 45°C. The cooling water is heated up from 20 to 35°C. The heat capacity of water may be assumed to be constant at 4.18 kg/kg K. The heat of vaporization is assumed to be a typical value for an organic acid: 400 kJ/kg. The heat capacity at constant pressure, Cp, is assumed to be constant at 2 kJ/kg.K. a) Calculate the ratio of the mass flow rates of the condensing vapor and the cooling water. b) Calculate the rate of energy transfer from the condensing vapor to the cooling water in kJ/kg of vapor passing through the condenser.

Example: A biomass pyrolysis reactor produces a pyrolysis vapor, which is a complex mixture of organic compounds and water. In this example, we consider an indirect contact heat exchanger for complete condensation of this vapor, with water used as cooling liquid. The vapor (containing no liquid droplets) enters the condenser at its boiling point of 380 K (assumed to be constant); it leaves the heat exchanger at 45°C. The cooling water is heated up from 20 to 35°C. The heat capacity of water may be assumed to be constant at 4.18 kg/kg K. The heat of vaporization is assumed to be a typical value for an organic acid: 400 kJ/kg. The heat capacity at constant pressure, Cp, is assumed to be constant at 2 kJ/kg.K. a) Calculate the ratio of the mass flow rates of the condensing vapor and the cooling water. b) Calculate the rate of energy transfer from the condensing vapor to the cooling water in kJ/kg of vapor passing through the condenser.

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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Example: A biomass pyrolysis reactor produces a pyrolysis vapor, which is a complex mixture of organic compounds and water. In this example, we consider an indirect contact heat exchanger for complete condensation of this vapor, with water used as cooling liquid. The vapor (containing no liquid droplets) enters the condenser at its boiling point of 380 K (assumed to be constant); it leaves the heat exchanger at 45°C. The cooling water is heated up from 20 to 35°C. The heat capacity of water may be assumed to be constant at 4.18 kg/kg K. The heat of vaporization is assumed to be a typical value for an organic acid: 400 kJ/kg. The heat capacity at constant pressure, Cp, is assumed to be constant at 2 kJ/kg.K. a) Calculate the ratio of the mass flow rates of the condensing vapor and the cooling water. b) Calculate the rate of energy transfer from the condensing vapor to the cooling water in kJ/kg of vapor passing through the condenser.
Transcribed Image Text:Example: A biomass pyrolysis reactor produces a pyrolysis vapor, which is a complex mixture of organic compounds and water. In this example, we consider an indirect contact heat exchanger for complete condensation of this vapor, with water used as cooling liquid. The vapor (containing no liquid droplets) enters the condenser at its boiling point of 380 K (assumed to be constant); it leaves the heat exchanger at 45°C. The cooling water is heated up from 20 to 35°C. The heat capacity of water may be assumed to be constant at 4.18 kg/kg K. The heat of vaporization is assumed to be a typical value for an organic acid: 400 kJ/kg. The heat capacity at constant pressure, Cp, is assumed to be constant at 2 kJ/kg.K. a) Calculate the ratio of the mass flow rates of the condensing vapor and the cooling water. b) Calculate the rate of energy transfer from the condensing vapor to the cooling water in kJ/kg of vapor passing through the condenser.
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