Refrigerant Leakage: The Emissions Problem Hidden in the Plant Room

A frozen food factory can spend months arguing over electricity contracts, compressor upgrades and freezer dwell time, while the more awkward problem sits behind a plant room door: a refrigerant circuit that needs topping up again, a valve that has never quite stopped sweating oil, a service record that looks harmless until someone adds the kilograms together. Refrigerant leakage is the escape of cooling gas from refrigeration equipment during operation, servicing, damage or end-of-life handling, and in frozen food it matters because the gas itself can become a climate liability before the electricity bill is even discussed.

The leak does not stand in the freezer aisle

Most people in frozen food meet refrigeration through temperature. A minus 18 degrees Celsius store. A tunnel freezer running after a long vegetable shift. Ice cream that comes back from a weak cabinet with a sandy texture. Frozen seafood that has survived the journey, but only just.

The refrigerant circuit is usually somewhere else. In the plant room. On the roof. In a ceiling void. Behind the retail cabinet line. Along pipework that has been altered, patched, extended and insulated until nobody remembers the original layout.

That distance is part of the problem.

Energy gets attention because it arrives as a bill. Refrigerant loss is quieter. It appears as a service visit, a top-up cylinder, an alarm that was cleared, a compressor running badly, a coil that keeps frosting in the wrong way. Sometimes it appears as nothing more than a technician saying the circuit was “a little low again.”

In climate terms, that is not a minor engineering detail. It is direct emissions.

Direct emissions occur when refrigerant reaches the atmosphere. The impact depends on the type of gas and the amount released. Many older hydrofluorocarbon (HFC) refrigerants have high global warming potential, which means a small physical leak can carry a much larger carbon dioxide equivalent impact. Ammonia, carbon dioxide (CO2) and hydrocarbons sit in a different category, with much lower climate impact from leakage, although they bring their own design, pressure, toxicity or flammability requirements.

The frozen sector has a special exposure because refrigeration is not a support function. It is the condition of the business. Raw material holding, freezing, packing, cold storage, dispatch, retail cabinets and foodservice freezers all depend on it. A plant can look disciplined from the production floor and still be losing refrigerant in places no buyer ever sees.

Climate performance can be lost before the meter is read

Refrigeration climate impact is often discussed through electricity. Compressors, evaporator fans, condensers, pumps, defrost cycles and controls all draw power. That side is real, measurable and financially painful.

But electricity is only half the picture.

If refrigerant escapes, the gas loss itself becomes an emissions event. If the circuit then runs below proper charge, the installation may also consume more energy to hold the same temperature. Evaporators may feed poorly. Compressor run time may rise. A freezer may still reach the set point, but with less headroom. In a cold store, that difference may show up only on a hot afternoon when the doors have been busy and the room does not recover as cleanly as it used to.

That is where the argument becomes uncomfortable. A company can invest in efficient motors and still carry a preventable climate problem through leaking pipework, tired seals, damaged coils, weak commissioning or poor service routines. A retailer can put doors on frozen cabinets and still lose ground through refrigerant management. A cold store can talk about renewable electricity while treating gas additions as routine maintenance.

Older estates are often messy. A potato line gets expanded. A bakery freezer is added after a contract win. A ready meal room takes on a second blast freezer. A temporary evaporator remains in use for years. More valves, more joints, more vibration, more pipe supports, more chances for small failure. The refrigeration charge grows, but the paperwork may not keep up.

Refrigerant choice changes the size of the problem, not the need for control. Ammonia, also known as R717, is common in industrial refrigeration and has very low climate impact as a leaked refrigerant, but it demands trained people and serious safety management. Carbon dioxide, known as R744, has low global warming potential and is widely used in commercial and industrial designs, but it operates at high pressure and needs careful engineering. Propane, known as R290, can work well in suitable equipment, but flammability limits cannot be treated casually. Newer hydrofluoroolefin (HFO) blends may reduce global warming potential compared with many older HFCs, yet leakage, servicing and application still matter.

Low-GWP refrigerant leaking from badly managed equipment is still bad refrigeration practice. High-GWP refrigerant leaking from old plant is worse because the gas loss itself can dominate the climate story.

In Europe, this issue also has a regulatory edge. Regulation (EU) 2024/573 on fluorinated greenhouse gases has applied since 11 March 2024, tightening the direction away from high-GWP refrigerants and reinforcing the long-term pressure on HFC use. For frozen food operators, leakage is therefore not only a climate accounting problem. It also affects maintenance discipline, future service risk, replacement planning and the credibility of any refrigeration-related sustainability claim.

The plant room has better memory than the sustainability report

Refrigerant leakage is not usually revealed by one dramatic failure. It is seen in records. Or in the absence of them.

How much refrigerant was added last year? Which circuit needed it? Was the leak found or only the charge restored? Did the same valve, compressor seal or coil appear twice? Was refrigerant recovered during repair? Were follow-up checks done after pressure testing? Does anyone compare refrigerant purchases with contractor reports?

These are ordinary questions. They are also the questions that show whether the site is managed or merely kept cold.

Frozen categories experience the consequences differently. Ice cream is unforgiving because texture tells the story fast. Seafood gives little room for casual temperature drift. Frozen fruit may tolerate storage until dehydration, clumping or frost starts showing in the bag. Vegetables can look safe while suffering handling damage that later becomes customer dissatisfaction. Potato products may be relatively stable, but carton condition, freezer recovery and pallet temperature still matter. Ready meals bring dense cases, mixed components and packaging formats that can hide slow recovery until complaints arrive.

A small leak may not create a visible product failure on Monday. That is why it survives. The freezer still freezes. The store still dispatches. The cabinet still looks cold during a morning walk-through.

Then summer arrives. Loading doors stay open longer. Condensers work harder. Staff move pallets faster than the dock can handle. The same weak refrigeration circuit that looked acceptable in February begins to show its age.

Modern monitoring helps, but it is not a cure by itself. Fixed leak detection, pressure trend analysis, temperature data, gas level tracking, alarm review and refrigerant logs can all expose losses earlier. A sensor ignored by the night shift is just another blinking light. A dashboard nobody reconciles with service invoices is decoration with passwords.

Good practice is usually unglamorous. Clean installation. Correct pipe supports. Vibration control. Proper brazing. Accessible valves. Clear labelling. Leak checks after service, not only before. Accurate logs. Contractor accountability. Repairs that close the cause, not only the symptom.

Common mistake: treating refrigerant like an engineering consumable

The common mistake is to treat refrigerant as something engineers handle and accountants pay for. A technical fluid. A service line. A cost of keeping the building cold.

That view is too crude for modern frozen food.

Refrigerant is part of the emissions profile of a site. The type matters. The charge matters. The leakage history matters. The recovery practice matters. The contractor’s competence matters. So does the age of the plant and the honesty of the records.

A frozen bakery gives a useful example. The blast freezer may be judged by throughput, crust behaviour, pack-out temperature and moisture loss. Those are visible production measures. But if the refrigeration installation serving that freezer has repeated top-ups, the climate reading cannot be reduced to kilowatt-hours per tonne. The direct gas loss belongs in the calculation. So does the extra electricity used when the circuit is running below its intended condition.

Total Equivalent Warming Impact (TEWI) is one practical way to think about this because it brings together direct refrigerant emissions and indirect emissions from energy use over the life of the equipment. It does not replace engineering judgment. It stops the conversation from pretending that power consumption is the whole story.

The same logic applies in retail. A frozen cabinet line can look modern from the aisle: glass doors, bright lighting, neat category blocking, well-faced ice cream tubs. Behind that neat display, repeated refrigerant loss can turn a good-looking estate into a weaker climate performer. Store staff may notice icing, slow pull-down after restocking or repeated contractor visits before head office sees the pattern in the data.

Refrigerant leakage is often a test of management culture. Not the slogan version. The practical version. Who reads the log? Who challenges repeat top-ups? Who signs off the repair? Who knows when old high-GWP equipment will be replaced, and who is pretending that replacement can be postponed forever?

Questions buyers should ask suppliers

Food safety audits already ask hard questions about allergens, traceability, temperature control and foreign body management. Refrigerant management deserves a place beside those checks when a supplier’s climate claims are part of the offer.

• Which refrigerants are used on site, and what is the full charge of each main installation?
• How much refrigerant was added during the past 12 months, by circuit rather than as a site total?
• Are repeated leaks traced to specific components, rooms or service events?
• Does the site calculate direct refrigerant emissions separately from electricity-related emissions?
• What fixed detection, alarm review or trend monitoring is used on the main refrigeration plant?
• How are contractors checked for leak testing, recovery practice, documentation and repair follow-up?
• Is there a replacement or phase-down plan for older equipment using high-GWP refrigerants?
• What happens to refrigerant during decommissioning, and how is recovery documented?

These questions are practical. They belong in technical approval, cold storage contracts, retail supply reviews and logistics tenders. A supplier that cannot answer them may still be capable. But the silence is not neutral.

Not every site can replace refrigeration equipment quickly. Capital cycles are long. Ammonia and CO2 projects require design work, safety planning and sometimes building changes. Smaller processors and foodservice operators may have fewer options in the short term.

Leakage control does not need to wait for a new plant.

The gas is either being lost or it is not. The loss is being measured or guessed. The repair is being completed or postponed. In frozen food, that makes refrigerant leakage one of the more concrete climate tests in the building: less visible than the energy meter, but sometimes more revealing when the records are opened.