Familiarity with the basic vocabulary of thermodynamics.
Identify unit operations that transfer energy to or from the H2O. Equate changes in the temperature, pressure, or phase of H2O with changes in enthalpy. Apply fundamentals of thermodynamics to the analysis of an engineering process. Write a clear description of an engineering process using appropriate technical vocabulary.
May be used in-class or as homework, in teams or as individuals. Could also be used as a "first exposure" assignment, to get students to think about how to apply information they are to read in the texbook before they come to lecture.
Text of Learning Exercise:
Energy Balances Physical and Energetic Transformations in Power Generation from Steam
Take virtual tour of the Michigan State University Power Plant on the web. http://www.chems.msu.edu/classes/321/powerplant/
This website was originally developed by Dr. Carl Lira for one of his courses, so there may be a few comments in the text that are specific to his course.
Using the information in the virtual tour, information in your text, and your own knowledge and understanding of engineering, describe the power generation process in terms of the physical and energetic changes undergone by the water at each step. In other words,
for each unit operation in the power generation process:
(1) Describe the changes in the thermodynamic state of the water (temperature, pressure, phase, specific enthalpy) as it passes through that unit operation.
(2) Describe how the energy is transferred to / from the water in each unit operation, including identifying the source of / sink for the energy. If energy is transferred to / from another flowing stream, explain whether the streams are mixed together or whether the energy is transferred through a pipe wall or something similar.
Your description of the power generation process should be an example of good technical writing. It should give an overview of the process, and then discuss the individual unit operations in a logical order. It should be clear, concise, and use technical terms correctly.
Primary Traits for Grading
The student?s description correctly:
(1) Identifies all unit operations in the power generation cycle and lists them in logical order.
(2) Identifies all changes in the thermodynamic state of water in each unit operation, including a clear statement of whether the value of each state variable increases, decreases, or remains constant.
(3) Identifies the source of / sink for energy transferred in each unit operation and describes the mechanism of energy transfer.
(4) Provides a concise overview of the power generation process first. Uses standard technical terms to name the unit operations and describe how they are connected such that the description is understandable even without a diagram for reference.
(5) Uses standard written English (complete sentences,
correct grammar, correct spelling). Avoids the use of colloquial language or anthropomorphism.