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Problem 1.29 (modified), Masters and Ela, Introduction to Environmental Engineering and Science, 3rd Ed.: A 950-MWe power plant has an efficiency of 39 percent with 20 percent of the waste heat being released to the atmosphere as exhaust stack heat and the other 80 percent taken away in the cooling water. Consider two cases for power plant cooling. a. Cooling water is drawn from a river with an upstream flow of 110 m³/s and a temperature of 15 °C and is returned to the river after cooling the power plant. i. Is the system an open system or closed system? ii. Construct an energy balance for the system. iii. If the cooling water is only allowed to rise in temperature by 13 °C, what flow rate from the river would be required?

Problem 1.29 (modified), Masters and Ela, Introduction to Environmental Engineering and Science, 3rd Ed.: A 950-MWe power plant has an efficiency of 39 percent with 20 percent of the waste heat being released to the atmosphere as exhaust stack heat and the other 80 percent taken away in the cooling water. Consider two cases for power plant cooling. a. Cooling water is drawn from a river with an upstream flow of 110 m³/s and a temperature of 15 °C and is returned to the river after cooling the power plant. i. Is the system an open system or closed system? ii. Construct an energy balance for the system. iii. If the cooling water is only allowed to rise in temperature by 13 °C, what flow rate from the river would be required?

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
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Problem 1.29 (modified), Masters and Ela, Introduction to Environmental Engineering and Science, 3rd Ed.: A 950-MWę power plant has an efficiency of 39 percent with 20 percent of the waste heat being released to the atmosphere as exhaust stack heat and the other 80 percent taken away in the cooling water. Consider two cases for power plant cooling. a. Cooling water is drawn from a river with an upstream flow of 110 m³/s and a temperature of 15 °C and is returned to the river after cooling the power plant. i. Is the system an open system or closed system? ii. Construct an energy balance for the system. iii. If the cooling water is only allowed to rise in temperature by 13 °C, what flow rate from the river would be required? b. If instead of drawing water from a river, heating it, and returning it to the river, the plant could use an evaporative cooling tower wherein heat is released to the atmosphere as cooling water is vaporized into steam. i. Is the system an open system or closed system? ii. Construct an energy balance for the system iii. At what flow rate must 15 °C makeup water be provided from the river to offset the water lost in the cooling tower?
Transcribed Image Text:Problem 1.29 (modified), Masters and Ela, Introduction to Environmental Engineering and Science, 3rd Ed.: A 950-MWę power plant has an efficiency of 39 percent with 20 percent of the waste heat being released to the atmosphere as exhaust stack heat and the other 80 percent taken away in the cooling water. Consider two cases for power plant cooling. a. Cooling water is drawn from a river with an upstream flow of 110 m³/s and a temperature of 15 °C and is returned to the river after cooling the power plant. i. Is the system an open system or closed system? ii. Construct an energy balance for the system. iii. If the cooling water is only allowed to rise in temperature by 13 °C, what flow rate from the river would be required? b. If instead of drawing water from a river, heating it, and returning it to the river, the plant could use an evaporative cooling tower wherein heat is released to the atmosphere as cooling water is vaporized into steam. i. Is the system an open system or closed system? ii. Construct an energy balance for the system iii. At what flow rate must 15 °C makeup water be provided from the river to offset the water lost in the cooling tower?
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