10. In a steam boiler, hot gases from a fire transfer heat to water which vapourizes at constant temperature. In certain case, the gases are cooled from 1100°C to 550°C while the water evaporates at 220°C. The specific heat of gases is 1.005 kJ/kg K, and the latent heat of water at 220°C is 1858.5 kJ/kg. All the heat transferred from the gases goes to the water. How much does the total entropy of the combined system of gas and water increase as a result of irreversible heat transfer ? Obtain the result on the basis of 1 kg of water evaporated. If the temperature of the surroundings is 30°C find the increase in unavailable energy due to irreversible heat transfer. [Ans. 2.045 kJ/K, 620 kJ]
10. In a steam boiler, hot gases from a fire transfer heat to water which vapourizes at constant temperature. In certain case, the gases are cooled from 1100°C to 550°C while the water evaporates at 220°C. The specific heat of gases is 1.005 kJ/kg K, and the latent heat of water at 220°C is 1858.5 kJ/kg. All the heat transferred from the gases goes to the water. How much does the total entropy of the combined system of gas and water increase as a result of irreversible heat transfer ? Obtain the result on the basis of 1 kg of water evaporated. If the temperature of the surroundings is 30°C find the increase in unavailable energy due to irreversible heat transfer. [Ans. 2.045 kJ/K, 620 kJ]
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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![10. In a steam boiler, hot gases from a fire transfer heat to water which vapourizes at constant temperature.
In certain case, the gases are cooled from 1100°C to 550°C while the water evaporates at 220°C. The
specific heat of gases is 1.005 kJ/kg K, and the latent heat of water at 220°C is 1858.5 kJ/kg. All the heat
transferred from the gases goes to the water. How much does the total entropy of the combined system of
gas and water increase as a result of irreversible heat transfer ? Obtain the result on the basis of 1 kg of
water evaporated. If the temperature of the surroundings is 30°C find the increase in unavailable energy
due to irreversible heat transfer.
[Ans. 2.045 kJ/K, 620 kJ]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F54c634de-ead1-43a6-8db0-8fb273ab6e75%2Fb518f925-5c5b-48fa-b5b5-d3e54b125cbe%2Fa1fo13_processed.jpeg&w=3840&q=75)
Transcribed Image Text:10. In a steam boiler, hot gases from a fire transfer heat to water which vapourizes at constant temperature.
In certain case, the gases are cooled from 1100°C to 550°C while the water evaporates at 220°C. The
specific heat of gases is 1.005 kJ/kg K, and the latent heat of water at 220°C is 1858.5 kJ/kg. All the heat
transferred from the gases goes to the water. How much does the total entropy of the combined system of
gas and water increase as a result of irreversible heat transfer ? Obtain the result on the basis of 1 kg of
water evaporated. If the temperature of the surroundings is 30°C find the increase in unavailable energy
due to irreversible heat transfer.
[Ans. 2.045 kJ/K, 620 kJ]
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