The Natural Refrigeration Review is a quarterly publication that contains technical articles, regulatory and code updates, industry news and information about IIAR activities and publications. It is distributed by email to all IIAR Members and IIAR Contact lists.
SPRING 2026 NATURAL REFRIGERATION REVIEW
The Natural Refrigeration Review issues are available as a PDF downloads for both lIAR Members and Non-members, or as individual article posts below. Click the button below to view the full issue, or scroll through all the individual issue articles below.
Water Contamination in an Ammonia Refrigeration System Leads to Higher Costs
In many closed-circuit ammonia refrigeration systems, water contamination can occur over a period of time and the effects of that contamination can easily go unnoticed. One thing water contamination can do is cause an aqueous ammonia solution to be formed, which then replaces anhydrous ammonia refrigerant. This problem can become continuous if it isn’t resolved and will increase over time if the source is not identified.
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Learning from the Past
I am sure that many of us have seen ammonia refrigeration systems that have operated for several decades, with equipment and system components functioning well past recommended operating life. This is a credit to manufacturers, installers, service technicians, and operators. Aging equipment and piping at some point will eventually require replacement. Or the system or portion of it may be decommissioned due to a business discussion.
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OSHA Announces New “Safety Champions” Voluntary Program
In January 2026, the Occupational Safety and Health Administration (OSHA) announced the creation of a new voluntary program called Safety Champions which has been added to the suite of cooperative programs (such as the OSHA Challenge and Voluntary Protection Program) administered by the agency.
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Welcome to San Antonio!
Welcome IIAR members and guests to the 48th IIAR conference, and welcome to San Antonio. While we’re still two years away from our truly historic 50th anniversary, I’d argue we’re entitled to start celebrating now. So much of the work we, and IIAR’s past leaders, have put into advancing natural refrigeration, is paying off these days.
Read MoreAmmonia Refrigeration: a ‘Century-Proof’ Technology
In 1926, ammonia was the dominant refrigerant for large-scale refrigeration applications. Leading up to that point, ammonia refrigeration played a key role in the industrial revolution, earning itself, along with other natural refrigerants, a reputation for being a “century-proof” technology. Spanning the late 1800s, when steam engines gave rise to the first basic mechanical refrigeration systems -- to 2026, when natural refrigerants and specialized equipment are able to deliver precise temperature control -- the natural refrigeration industry underpins many of the most important advancements of modern life.
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IIAR, TRA Announce New Partnership to Advance Natural Refrigerants in Thailand
The Thai Refrigeration Association, representing Thailand’s refrigeration and air conditioning industry, and IIAR signed a memorandum of understanding outlining a recent collaboration, giving TRA access to IIAR’s suite of standards and making it one of IIAR’s global partners.
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MRBraz Expands Construction and Services Division with InterCool USA Integration
MRBraz & Associates, PLLC, announces the strategic expansion of its construction and services division through the integration of InterCool USA’s national infrastructure and technical expertise. This move marks a significant milestone in MRBraz’s commitment to delivering scalable, sustainable, and safety-focused refrigeration solutions across the Americas.
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IIAR Chile Chapter Breaks Attendance Record, Paraguay Adopts IIAR-2
IIAR's Chile Chapter, along with The Chilean Chamber of Refrigeration and Air Conditioning, said the organizations' twenty-eighth Seminar on Natural Refrigeration for Latin America drew over 350 attendees, the largest number of attendees in the event's history. “This was the largest IIAR event yet in Chile,” said Yesenia Rector, Vice President of Education, Outreach, and Events.
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Creating Your Pressure Vessel Replacement Framework
When it’s time to replace a pressure vessel in an industrial refrigeration system, the stakes can be high and the questions are many. To help operators, engineers, and manufacturers navigate this complex process, IIAR recently hosted a member webinar titled Considerations for Pressure Vessel Replacement. The presentation laid out a question-and-answer framework designed to guide decision-making and ensure long-term mechanical integrity for your refrigeration system.
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IIAR Delivers IIAR 9 Training at RETA
The International Institute of All-Natural Refrigeration delivered its IIAR 9 Certificate Course at the RETA 2025 National Conference Oct 18 and 19 in Spokane, WA. IIAR said it plans to deliver a course for IIAR 6-2025 during the RETA 2026 National Conference. IIAR 9 provides the minimum safety requirements for existing closed-circuit ammonia refrigeration systems as well as provides a method to determine if existing stationary closed-circuit refrigeration systems using ammonia as a refrigerant comply with the minimum system safety requirements. Tony Lundell, IIAR’s Senior Director of Standards and Safety delivered the course.
Read MoreEnergy Efficiency: To Reduce Energy Expenditure, Lower Cost, Clean Evaporator Coils
Numerous factors can contribute to decreases in a refrigeration system’s energy efficiency, not the least of which is its cleanliness. Much of the time, when facility operators see a facility’s efficiency drop, they believe that indicates they must replace the systems with larger units, when in fact, they often simply need to clean the systems they’re currently using - particularly the evaporators. The evaporator is the component of a closed-circuit refrigeration system that absorbs heat by vaporizing liquid refrigerant. The evaporator coil is the part of the system not enclosed in a pressure vessel. There are two types of evaporators: forced draft, in which air is pushed through the coils, and induced draft, with air pulled through the coils by fans.
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Lesson Learned: Where’s that vapor going?
Where’s that vapor going? Sooner or later that question must be answered when some type of work is required on an ammonia refrigeration system. To accomplish the work, the system may have to be opened, and later that portion of the system pressure tested. The pressure testing process will typically involve some amount of ammonia used in the final test, after which the pressure is removed again before the portion of the system tested is placed back into operation.
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IIAR Government Affairs
On September 30th, The Environmental Protection Agency (EPA) announced a proposed rule to reconsider policies contained in the Technology Transitions Rule under the American Innovation and Manufacturing (AIM) Act. The AIM Act, passed in 2020, directs EPA to address hydrofluorocarbons (HFCs) in three main ways.
Read MoreIIAR Releases Hydrocarbon and Ammonia Fact Sheets
The International Institute of All-Natural Refrigeration (IIAR) has released two new fact sheets – the Hydrocarbon and Ammonia fact sheets to meet growing demand for accessible, technically sound guidance on natural refrigerants. The newly released fact sheets are part of a trio of refrigerant summaries, including one previously released for CO2. All three cover safety considerations, system guidelines, and design considerations.
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Condenser Debuts Name Change: Flagship Publication to Become Natural Refrigeration Review
After a 30-plus-year run as the Condenser magazine, the International Institute of All-Natural Refrigeration said its long-running member journal will be rebranded in 2026 to become the Natural Refrigeration Review. IIAR said the organization's Board of Directors voted for the change as a way to reflect the expansion of the publication in recent years. The rebranding follows the IIAR's name change for both the Institute and the Foundation.
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President’s Message: Announcing the IIAR Resource Center
One of the greatest strengths of IIAR is our ability to turn out educational and informational resources with the technical rigor you’d expect from a group of engineers that first convened to develop safety standards for their industry and haven’t quit since. In these days of information overload, our commitment to producing real, vetted resources for our industry – and each other – carries that energy forward. It comes out at our meetings, where I can’t make it down a hallway without hearing a new proposal for a new fact sheet, whitepaper, policy analysis or obscure detail that needs addressing in our ever-evolving suite of standards.
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Are Natural Refrigerants Breaking Climate Change? IIAR’s Standards and the Evolving Global Cold Chain
As climate goals and efficiency become the central focus behind cold chain decisions, both at the individual and government level, natural refrigerants are becoming a global movement, increasingly unencumbered by regional political landscapes. In Latin America, a surge in CO₂ systems is happening, while in Europe, focus is growing on a policy-driven adoption of refrigerants like ammonia and hydrocarbons. The global regulatory landscapes remain uneven, but in many places, the tide is turning. Natural refrigerants are outgrowing national constraints, propelled by international climate agreements . . .
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Momentum Builds for CO2 at District Energy Conference
Nearly 900 district energy professionals from 30 countries convened in Minneapolis, Minnesota, for the Annual IDEA District Energy Conference and Trade Show, held June 2–5, 2025, where the International Institute of All-Natural Refrigeration (IIAR) was invited to attend and contribute to IDEA’s business meeting. The meeting with IIAR was organized to explore ways for IIAR members and equipment manufacturers to expand the use of natural refrigerants—particularly in heat pumps and chillers—across the district heating and cooling industry.
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IIAR Exhibitors Plan for 2026 San Antonio Conference
The International Institute of All-Natural Refrigeration will host its largest-ever Natural Refrigeration Conference & Expo from March 15 – 18, 2026, in San Antonio, Texas—featuring a packed exhibit hall, approximately 30 educational sessions, including technical papers, white papers, workshops and panels as well as educational programming for students and end users. Rym Omniewski, IIAR’s Meetings, Conference & Expo Coordinator, said three new factors, introduced this year, are attracting interest from the event’s exhibitors and attendees.
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IIAR Suite of Standards Update: IIAR 5, 6, and 7 2025 Revisions Approved
The International Institute of All-Natural Refrigeration standards revisions presently has IIAR 2 under review for its targeted 2026 revision. Standards IIAR 4, IIAR 8, and IIAR 9 are currently open for review as well, and IIAR 5, IIAR 6, and IIAR 7 revisions were ANSI “approved” in July 2025. Meanwhile, IIAR’s first hydrocarbons standard is targeted for an ANSI approval in 2025, while the ANSI/IIAR CO2-2021 Safety Standard for Closed-Circuit Carbon Dioxide Refrigeration Systems is finalizing an Addendum A soon and will sequentially be opened for its targeted 2026 revision.
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