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Cool as a Cucumber

Designing a Refrigeration System


Author(s)

Helen S. Joyner
School of Food Science
University of Idaho
hjoyner@uidaho.edu

Abstract

In this case study, students are asked to design a new refrigeration system for a company that stores produce. Students will need to consider various aspects of refrigeration system design, such as single- versus multi-stage, size, operating temperatures and pressures, cooling load, compressor efficiency, overall system efficiency, and cost. An Excel spreadsheet is provided for students to design their system (see Supplemental Materials).  All calculations are performed by the spreadsheet; students input their desired values.  After the refrigeration system is designed to the satisfaction of the students, they are asked to discuss why they chose their specific operating parameters. This case study is appropriate for food engineering, food processing, and introductory heat transfer courses.


Objectives

  • Explain the various factors that affect cooling load/capacity for refrigerated and frozen foods.
  • Discuss factors contributing to refrigeration system inefficiency.
  • Apply heat transfer principles to determine cooling load for a refrigeration system.
  • Design single- and multi-stage refrigeration systems.

Keywords

engineering; refrigeration; cooling; system efficiency; frozen food; produce; single-stage; multi-stage; food processing; food science;

Educational Level

Undergraduate upper division, Continuing education

Format

PDF, Excel

Type Methods

Analysis (Issues), Discussion, Interrupted

Language

English

Subject Headings

Chemical Engineering  |   Engineering (General)  |   Food Science / Technology  |  


Date Posted

10/25/2016

Teaching Notes

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Teaching notes are intended to help teachers select and adopt a case. They typically include a summary of the case, teaching objectives, information about the intended audience, details about how the case may be taught, and a list of references and resources.

Supplemental Materials

The Excel spreadsheet below is used in Part III of the case study to design a refrigeration system.


  refrigeration.xlsx

Answer Key

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