Write and simplify the general energy balance for these open systems. Clearly state/draw where inlet point and outlet point are in your system (this will affect your answer). State if heat and shaft work are positive or negative (if non-zero).
Write and simplify the general energy balance for these open systems. Clearly state/draw where inlet point and outlet point are in your system (this will affect your answer). State if heat and shaft work are positive or negative (if non-zero).
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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Transcribed Image Text:Write and simplify the general energy balance for these open systems. Clearly state/draw where
inlet point and outlet point are in your system (this will affect your answer). State if heat and shaft
work are positive or negative (if non-zero).
a. Water flows through a heat exchanger and is heated from 20°C to 50°C. The inlet and outlet
pipe diameters are the same and have the same elevation.
b. Ariver flows over a dam and falls on a turbine which turns a shaft connected to a generator.
The water velocity, temperature and pressure are essentially unchanged.
c. Water is pumped from a valley lake to a hill-top community, high above the valley. The pipe
diameter is constant and the pump is located in the middle of the pipeline. Energy
dissipated by friction is transferred to the surroundings through the pipe wall.
d. A chemical reaction takes place in a continuous flow reactor. The reactor has no moving
parts and kinetic and potential energy changes are negligible.
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