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ME303: Thermal-Fluid Systems

Unit 6: Cooling and Refrigeration   You may be familiar with different types of cooling equipment and operations.  All of these involve the transfer of energy from a high temperature source to a low temperature sink.  The cooling of your body by a combination of convective heat transfer and evaporation of sweat is an example with which you are certainly familiar.  It has much in common with the operation of the cooling towers you may associate with large power plants.  Another familiar example involves the absorption of heat at low temperature by the expansion of a gas and the rejection of that heat at a higher temperature by the compression of a gas.  This type of operation can be found in a home air conditioner or refrigerator. 

Unit 6 Time Advisory
This unit should take you 19 hours to complete.

☐    Introductory Reading: 4 hours

☐    Subunit 6.1: 2 hours

☐    Subunit 6.2: 4 hours

☐    Subunit 6.3: 4 hours

☐    Subunit 6.4: 4 hours

☐    End of Unit Self-Assessment: 1 hour

Unit6 Learning Outcomes
Upon successful completion of this unit, the student will be able to:

  • Categorize types of refrigeration and cooling operations.
  • Calculate and understand the significance of the coefficient of performance of various cooling operations.
  • Compare, contrast, and choose between various cooling operations and refrigerants for optimal performance.

  • Reading: OnlineFreeEBooks.net: IIT Kharagpur’s “Refrigeration and Air Conditioning” Link: OnlineFreeEBooks.net: IIT Kharagpur’s “Refrigeration and Air Conditioning” (HTML and PDF)
     
    Instructions: This resource contains a comprehensive discussion of refrigeration and air conditioning from a mechanical engineering perspective and will be used throughout this unit as a resource.  More specific lessons from this resource will be assigned as readings as you navigate this unit.  Many of the lessons are also available in video format on YouTube; for example, see this YouTube link on psychrometry or this one on the history of refrigeration.  The text also contains example problems and solutions.  Please note that many sections of this unit contain review material to which you have already been exposed.
     
    Terms of Use: Please respect the copyright and terms of use displayed on the webpages above.

  • Reading: University of Tulsa: Kenneth C. Weston’s “Energy Conversion: Chapter 8 Refrigeration and Air Conditioning” Link: University of Tulsa: Kenneth C. Weston’s “Energy Conversion: Chapter 8: Refrigeration and Air Conditioning” (PDF)
     
    Instructions: Please open the PDF above and read Chapter 8 (pages 282-332).  This chapter is a reference for the entire unit.  You may find the style of this chapter more accessible than IIT Kharagpur’s “Refrigeration and Air Conditioning.”
     
    Terms of Use: The linked material above has been reposted by the kind permission of Kenneth C. Weston, and can be viewed in its original form here.  Please note that this material is under copyright and cannot be reproduced in any capacity without explicit permission from the copyright holder. 

6.1 History of Refrigeration   - Reading: OnlineFreeEBooks.net: IIT Kharagpur’s “Refrigeration and Air Conditioning, Lessons 1-3” Link: OnlineFreeEBooks.net: IIT Kharagpur’s “Refrigeration and Air Conditioning, Lessons 1-3” (HTML or PDF)
 
Instructions: Click on the hyperlink for each lesson’s title to download the PDF file.   Read lessons 1-3 (approximately 20 pages for each lesson), and work through questions/problems at the end of each lesson.
 
Terms of Use: Please respect the copyright and terms of use displayed on the webpage above.

6.2 Review of Thermodynamics   - Reading: OnlineFreeEBooks.net: IIT Kharagpur’s “Refrigeration and Air Conditioning, Lessons 4 and 5” Link: OnlineFreeEBooks.net: IIT Kharagpur’s “Refrigeration and Air Conditioning, Lessons 4 and 5” (HTML or PDF)
 
Instructions: Click on the hyperlink for each lesson’s title to download the PDF file.   Read lesson 4 and 5 in their entirety (14-15 pages for each lesson) and work through questions/problems at the end of each lesson.  Pay careful attention to the definition of coefficient of performance (COP) on page 10 of Lesson 4.
 
Terms of Use: Please respect the copyright and terms of use displayed on the webpage above.

6.3 Air-cycle and Vapor Compression Methods   - Reading: OnlineFreeEBooks.net: IIT Kharagpur’s “Refrigeration and Air Conditioning, Lessons 8-10” Link: OnlineFreeEBooks.net: IIT Kharagpur’s “Refrigeration and Air Conditioning, Lessons 8-10” (HTML or PDF)
 
Instructions: Click on the hyperlink for each lesson’s title to download the PDF file.  Read each lesson in its entirety (Lesson 8 is 14 pages, Lesson 9 is 15 pages, and Lesson 10 is 18 pages).  Also, work through questions/problems at the end of each.
 
Terms of Use: Please respect the copyright and terms of use displayed on the webpage above.

6.4 Absorption Methods   - Reading: OnlineFreeEBooks.net: IIT Kharagpur’s “Refrigeration and Air Conditioning, Lessons 14” Link: OnlineFreeEBooks.net: IIT Kharagpur’s “Refrigeration and Air Conditioning, Lesson 14” (HTML or PDF)
 
Instructions: Click on the hyperlink for lesson 14’s title to download the PDF file.  Read the entire lesson (20 pages) and work through questions/problems at the end.
 
Terms of Use: Please respect the copyright and terms of use displayed on the webpage above.

Unit 6 Assessment   - Assessment: The Saylor Foundation’s “ME303: Unit 6 Quiz” Link: The Saylor Foundation’s “ME303: Unit 6 Quiz
 
Instructions: Please complete the linked assessment.
 
You must be logged into your Saylor Foundation School account in order to access this quiz.  If you do not yet have an account, you will be able to create one, free of charge, after clicking the link.