University of Florida

AOM 4062
Principles of Food Engineering

Semester Taught - Fall

Catalog Description

Credits: 4

The functional requirements and principles of operation of systems for handling and processing food and agricultural products.


Mac 1142 and 3 hours of Physics

Course Objectives

The student will become acquainted with the principles of handling and processing food and agricultural products. Particular emphasis will be given to the principles of operation of equipment used in the processing industry and the response of biological materials to these operations.


Dr. James D. Leary, P.E.
Office: 115 Rogers Hall
Work: 392-1864 x 115
Home: 336-1665

Material/Supply Fees


Class Materials Required

  1. Required Text: Singh, R.P. and D.R. Heldman. Introduction to Food Engineering. 4th Ed. Academic Press, Inc., 841 pp., 2009.
  2. Earle, R.L. Unit Operations in Food Processing. 2nd Ed. Pergamon Press. 207 pp., 1983.
  3. Henderson, S.M. and R.L. Perry. Agricultural Process Engineering. 3rd Ed. The AVI Publishing Co., Inc., 442 pp., 1976.
  4. Toledo, R.T. Fundamentals of Food Process Engineering. The AVI Publishing Co., Inc., 409 pp., 1980.
  5. Heldman, D.R. and R.P. Singh Food Process Engineering. 2nd Ed. Van Nostrand Reihold, 414 pp., 1981.

Course Outline

The course will consist of three lecture discussions per week and six, 2-hour laboratories during the semester. Coursework will consist of problem sets, quizzes, lab reports and examinations.

  1. Introduction
    • Course outline and instructional procedure
    • Grading
    • Chapter 1 (3 periods)
    • Dimensions, units and unit operations, and a brief discussion of systems
  2. Heat Transfer
    • Chapter 4 (14 periods)
    • Importance and definitions
    • Modes of heat transfer
      • conduction—Fourier’s equation
      • convection—Newton’s equation
      • radiation—Stefan-Boltzman equation
    • Steady and unsteady state heat conduction
    • Steady state heat conduction
      • composite walls
      • composite cylinders
    • Specific heat of materials
    • Heat exchanges
      • types
      • calculations
    • Freezing heat transfer
  3. Fluids
    • Chapter 2 (6 periods)
    • Classification of fluids
    • Types of flow (laminar and turbulent)
    • Bernoulli’s equation
    • Darcy’s formula
    • Fluid horsepower equation
    • Pumps
      • classifications
      • characteristics
  4. Energy Concepts and Thermal & Aseptic Processing
    • Chapter 3 (1 period)
    • Chapter 5 (1 period)
  5. Principles of Refrigeration
    • Chapter 6 (6 periods)
    • Natural refrigeration
    • Vapor compression refrigeration
      • outline of system
      • Mollier chart
      • refrigerants
      • rating of systems
      • compressors
      • evaporators and condensers
      • expansion valve and other controls
    • Heat pump
    • Absorption refrigeration
  6. Evaporation
    • Chapter 8 (5 periods)
    • The evaporator
    • Vacuum evaporation
    • Multiple effect evaporation
    • Condensers
    • Boiling point elevation
    • Vapor recompression
  7. Psychrometrics
    • Chapter 9 (3 periods)
    • Ideal gas law
    • The psychrometric chart
      • relative humidity
      • humidity ratio
      • specific volume
      • total heat, enthalpy
      • adiabatic processes
      • wet bulb temperature
      • dew point temperature
      • vapor pressure
    • Use of psychrometric charts
      • state factors
      • heating
      • cooling, dehumidifying
      • drying
      • air conditioning
  8. Laboratory Exercises
    • Heat transfer (lumped & biological)
    • Heat transfer (freezing)
    • Fluid flow
    • Fans
    • Refrigeration
    • Evaporation


A C- will not be a qualifying grade for critical tracking courses.  In order to graduate, students must have an overall GPA and an upper-division GPA of 2.0 or better (C or better).  Note: a C- average is equivalent to a GPA of 1.67, and therefore, it does not satisfy this graduation requirement.  For more information on grades and grading policies, please visit:

Grading Scale
A 93-100%
A- 90-92%
B+ 87-89%
B 83-86%
B- 80-82%
C+ 77-79%
C 73-76%
C- 70-72%
D+ 67-69%
D 63-66%
D- 60-62%
e <60%
Percent Points
Two 1-hr Exams 30% 150 each 300
Problem Sets 30% 33 @ 5,10,15 points 300
Quizzes 10% 10 @ 10 each 100
Laboratories 15% 6 @ 25 each 150
Final Exam 15% 150 150
Total 100%   1000 points


No make-up quizzes or exams will be given except for valid medical reasons or unless prior arrangements have been made.

Instructor's Policies

  1. Attendance and Expectations:

    • Problems assigned are due in my office by 5 pm on the day specified for full credit [midnight if electronic submission requested]  (10% deduction/day thereafter.  Maximum deduction is 50%).  For any partial credit, problem sets for material covered on an exam must be turned in at least two days before the exam on which the material is covered.  Credit will only be given for laboratories attended.  There will be a sign-in sheet.  You are responsible for signing the sheet.
    • Cell phone and musical device use is not allowed during class or lab.

Academic Honesty

As a student at the University of Florida, you have committed yourself to uphold the Honor Code, which includes the following pledge: “We, the members of the University of Florida community, pledge to hold ourselves and our peers to the highest standards of honesty and integrity.”  You are expected to exhibit behavior consistent with this commitment to the UF academic community, and on all work submitted for credit at the University of Florida, the following pledge is either required or implied: "On my honor, I have neither given nor received unauthorized aid in doing this assignment." 
It is assumed that you will complete all work independently in each course unless the instructor provides explicit permission for you to collaborate on course tasks (e.g. assignments, papers, quizzes, exams). Furthermore, as part of your obligation to uphold the Honor Code, you should report any condition that facilitates academic misconduct to appropriate personnel. It is your individual responsibility to know and comply with all university policies and procedures regarding academic integrity and the Student Honor Code.  Violations of the Honor Code at the University of Florida will not be tolerated. Violations will be reported to the Dean of Students Office for consideration of disciplinary action. For more information regarding the Student Honor Code, please see:  

Accommodation for Students with Disabilities

The Disability Resource Center coordinates the needed accommodations of students with disabilities. This includes registering disabilities, recommending academic accommodations within the classroom, accessing special adaptive computer equipment, providing interpretation services and mediating faculty-student disability related issues.

0001 Reid Hall, 352-392-8565,  

Software Use

All faculty, staff and student of the University are required and expected to obey the laws and legal agreements governing software use. Failure to do so can lead to monetary damages and/or criminal penalties for the individual violator. Because such violations are also against University policies and rules, disciplinary action will be taken as appropriate. We, the members of the University of Florida community, pledge to uphold ourselves and our peers to the highest standards of honesty and integrity.

Campus Helping Resources

Students experiencing crises or personal problems that interfere with their general well-being are encouraged to utilize the university’s counseling resources. The Counseling & Wellness Center provides confidential counseling services at no cost for currently enrolled students. Resources are available on campus for students having personal problems or lacking clear career or academic goals, which interfere with their academic performance.

  • University Counseling & Wellness Center, 3190 Radio Road, 352-392-1575,

    Counseling Services
    Groups and Workshops
    Outreach and Consultation
    Self-Help Library
    Training Programs
    Community Provider Database

  • Career Resource Center, First Floor JWRU, 392-1601,