Intermediate Ammonia Refrigeration Systems

Day 1

Workshop Introduction 
Refrigeration Systems Review 

• Introduction to types of systems: direct expansion, flooded, liquid overfeed
• System components and arrangements
• Refrigerant selection criteria

Properties of Ammonia Refrigerants 

• Fundamental properties: pressure, volume, temperature
• Derived properties: enthalpy, internal energy, transport
• Phase change
• Diagrams: pressure vs. enthalpy, pressure vs. temperature
• Refrigerant comparison: Fluorochemicals, ammonia, water, CO2
• Flash gas
• Subcooling and superheat
• Influence of water in ammonia refrigerant properties

Psychrometric Properties and Processes

• Definitions: dry bulb, wet bulb temperatures, humidity ratio, psychrometric chart
• Psychrometric processes: latent and sensible energy changes
• Effects of refrigerant evaporating temperature on space humidity levels

Property Workshop

Psychrometric Properties and Processes (continued)

Refrigeration Load Calculations

• Temperature requirements
• Loads: envelope, product, other internal heat gains
• Evaporator fan heat gains
• Make-up air loads
• Door loads - theory vs. real-world

Day 2

Refrigeration Cycles and Cycle Performance

• Conservation principles
• Performance measures
• Capacity and required refrigerant mass flow rates
• Overview of multi-stage systems

Compressors and Compressor Performance

• Interpreting compressor maps
• Correcting for actual compressor application/operation
• Compression ratio limits
• Part-load and off-design operation
• Oil cooler heat rejection methods (screw compressors)
• Economized ratings - when to/not to use (screw compressors)

Compressor Workshop

Vessels and Refrigerant Pumps

• Types: high-pressure receiver, low-pressure accumulator, flash intercooler
• Configurations: horizontal or vertical
• Ratings
• Proper practices for system integration
• Knock-out velocity and down-comer sizing
• Pump types and performance curves
• Net positive suction head available vs. required
• Refrigerant pump cavitation (causes and cures)

Day 3

Evaporators

• Types
• Performance characteristics and ratings
• Selection and operation
• Configuration: top feed or bottom feed
• Defrosting techniques
• Effects of pressure regulators
• Determining optimum refrigerant feed rates (overfeed systems)

Condensers and Heat Recovery

• System Types
• Performance characteristics
• Selection
• Heat recovery potential

Troubleshooting

• Condensers: liquid refrigerant hold-up, proper practices for parallel condenser operation
• Evaporator defrost best-practices
• Open question and answer

• 12/3/2025  08:00am - 05:00pm
• 12/4/2025  08:00am - 05:00pm
• 12/5/2025  08:00am - 02:00pm

All times listed are Central Time Zone.

This in-person course will have an online course site from which you will access the course materials, course evaluation, and participation certificate. Details on how to access the online course site will be sent with registration confirmation.

• Program Director

  Douglas Reindl

• Marc Claas

  Researcher

  Marc Claas is an Associate Researcher with the Industrial Refrigeration Consortium and has been involved in industrial refrigeration since 2009. His interests include refrigeration system maintenance requirements, criteria for safe system operation, troubleshooting systems for safe and efficient operation, regulatory compliance in refrigeration systems, and emerging cooling technologies. His teaching experience includes online operator training programs, and his field experience includes PSM related activities such as PSM audits and PHAs. He also has experience investigating energy efficiency and other operational opportunities. Claas holds a Bachelor’s degree in Mechanical Engineering from UW-Platteville and Master’s of Mechanical Engineering in Thermal Science from UW-Madison. He is an active member of the International Institute of Ammonia Refrigeration.

• Todd Jekel

  Assistant Director

  Todd Jekel, PhD, PE is the assistant director of the Industrial Refrigeration Consortium at the University of Wisconsin–Madison. Jekel has been actively conducting research on refrigeration systems including vessel design practices, oil separators, and analysis of dehumidification alternatives for cold storage warehouses. He holds degrees from Calvin College and the University of Wisconsin–Madison.

• Douglas Reindl

  Professor

  Douglas Reindl, PhD, PE is a professor at the Department of Mechanical Engineering and a Program Director at the Office of Interdisciplinary Professional Programs at the University of Wisconsin-Madison. He has extensive experience in mechanical systems – including industrial ammonia refrigeration systems. As the founding director of the Industrial Refrigeration Consortium, he works extensively to improve the safety, efficiency, reliability, and productivity of ammonia refrigeration infrastructure. Dr. Reindl received his BS in mechanical engineering technology from the Milwaukee School of Engineering, MS in mechanical engineering from UW–Madison, and PhD in mechanical engineering from UW–Madison. He is a registered professional engineer in the State of Wisconsin.

If you are planning to attend an Interdisciplinary Professional Programs course, payment is required at the time of registration. Below are the payment options:

Pay by Credit Card

Enroll online and pay by credit card.

• Search for the course on the website and then click on the Enroll Now button from the course webpage.
• Enter all necessary course attendee information and payment information on the course enrollment page.
• You will receive an email to confirm successful enrollment and payment.

Enroll over the phone and pay by credit card.

• Call CERC Registrations at 608-262-2451.
• Provide the registrations representative with:
  • the course name, dates, and/or course number.
  • the necessary course attendee information and payment information.
• You will receive either a mailed document or an email to confirm successful enrollment payment.

Pay by Check

Mail in a completed registration form and check payable to UW Madison.

• Fill out a registration form (found either in the back of the course brochure you received in the mail or here).
• Prepare a check, made payable to UW Madison.
• Mail the registration form and check to: CERC Registrations 21 N Park St, Ste 7101 Madison, WI 53715
• You will receive either a mailed document or an email to confirm successful enrollment and payment.

Pay by Purchase Order

• Request Purchase Order information from interpro@union.wisc.edu
  • If a fee quote is needed, contact custserv@interpro.wisc.edu first
• You will receive an invoice from UW–Madison Business Services for payment, usually within 3–5 business days

Military

If using SF-182 form, please call our registration number at 608-262-2451 or email interpro@union.wisc.edu for details and instructions.

Event Cancellation

We reserve the right to cancel a course due to insufficient enrollment or unforeseen events. If we cancel a course, participants will be notified via email or phone and will be given the option for a full refund or to transfer their registration and any fees paid to another course. We are not responsible for non-refundable plane tickets, hotel reservations, and other travel related expenses. For enrollee Course Cancellation, refer to notes on course page.

If you cannot attend, please notify us no later than one week before your course begins, and we will refund your fee. Cancellations received after this date and no-shows are subject to a $150 administrative fee. You may enroll a substitute at any time before the course starts.

Note: Participants are expected to have completed the Introduction to Ammonia Refrigeration Systems course or have significant work experience with refrigeration systems.

This course is part of the Process Safety Management Professional Certificate. Increase your knowledge and effectiveness at managing PSM/RMP programs for your ammonia refrigerated facility, while earning a recognized credential. Course can be taken individually as well.

Attendees participating in this course will be able to earn a digital badge as evidence of the knowledge they obtained during the course. Digital badges are micro-credentials that can be earned by successfully passing a final quiz administered online after completing the course. Click here for information on digital badges.