Ammonia refrigeration systems — industrial NH₃ plants, packages and conversions
Industrial ammonia refrigeration uses NH₃ (R717) — a natural refrigerant with zero GWP and zero ODP — in central, two-stage, low-charge packaged or NH₃/CO₂ cascade plants for cold stores, food processing and freezing. It is not a fluorinated gas, so it sits outside F-gas quota rules, but it is toxic and needs machinery-room design, gas detection, pressure-system controls and trained technicians. ColdMatch does not build or supply plants: our team reviews your ammonia project brief, contacts suitable suppliers on your behalf and presents organized responses for projects from USD 250,000.
What ColdMatch delivers
- State the duty per suction level and the room or process temperatures — the plant is sized on these, not on building area
- Choose the arrangement to price: central pumped plant, two-stage, low-charge packaged NH₃ or NH₃/CO₂ cascade
- Give site constraints: plantroom location, distance to occupied areas, power supply, ambient design conditions and heat-recovery demand
- Name the safety code and documentation bidders must design to (e.g. EN 378, IIAR, PSM/RMP in the US) and your on-site maintenance capability
- Ask every bidder to state total refrigerant charge, energy use at your design conditions, redundancy (N+1) and commissioning scope
- For HFC-to-NH₃ conversions, request a feasibility study covering existing evaporators, pipework, controls and machine-room changes
Compare NH₃ with CO₂ and HFC
You submit one RFQ. Our team handles the supplier outreach.
There is no direct buyer-to-supplier connection. Your request comes to the ColdMatch team, which contacts suitable suppliers and manufacturers on your behalf. Supplier and manufacturer information on this site is for research only; it is not a contact directory and does not mean a supplier has been vetted.
- You build your project and submit an RFQ.
- The ColdMatch team validates and organizes the requirements.
- We contact suitable suppliers and manufacturers for you.
- We present their organized responses to you through ColdMatch.
Supplier and manufacturer information is provided for research only; it is not a directory for direct contact. There is no direct buyer-to-supplier connection: every RFQ comes to the ColdMatch team, which validates it, contacts suitable suppliers on the buyer's behalf and presents organized responses through ColdMatch.
NH₃ vs HFC / CO₂ — sizing & TCO calculator
Estimate the CAPEX premium for a low-charge or two-stage ammonia plant, the annual energy saved vs an HFC baseline, and the simple payback for your project.
Indicative only. Coefficients reflect industry ranges for 300 kW – 2 MW industrial refrigeration; ejector, heat-recovery and site-specific factors will move real numbers ±20%. Use the RFQ Builder to obtain engineered vendor quotes before committing CAPEX.
Score every refrigerant quote on the same criteria
22 checklist items across load, site & safety, refrigerant scoring and commercial compliance. Enter your preferences and we'll email the PDF plus a supplier-neutral shortlist matched to your NH₃, CO₂ or HFC/HFO scenario.
- Total refrigeration load (kW) at design ambient
- Storage / process temperature set-points (°C) per zone
- Design ambient (°C) and altitude
- Annual operating hours per zone
- Product mix, throughput and future expansion (Phase 2 kW)
- Occupancy type (industrial, food factory, public building, port)
- Machinery room location, ventilation, gas detection budget
- Local codes: EN 378 / ASHRAE 15 / IIAR class and toxic zoning
- Distance to occupied areas / property line
- Water availability and quality for evaporative condensers
- GWP target and phase-down exposure (F-Gas 2024 / AIM Act)
- Toxicity / flammability tolerance for the site
- Ambient class (mild / warm / hot) vs CO₂ transcritical penalty
- Charge size, leak-rate exposure and refrigerant-cost trajectory
- Local service ecosystem: NH₃ certified techs / CO₂ trained crews
- Efficiency (COP) at design conditions vs HFC baseline
- CAPEX premium tolerated for lower lifetime OPEX
- Budget range (USD) and financing structure (self, lease, ECA, DFI)
- Payback / IRR hurdle rate
- ESG / Scope-1 refrigerant reporting requirement
- Insurance and permit constraints (ammonia PSM / CO₂ MAWP)
- Warranty, spares and 10-year TCO expectation
In depth: planning an ammonia (NH₃) refrigeration plant
Ammonia remains the efficiency reference for large cold stores, food processing and distribution centres. Getting it right depends as much on safety design and operating capability as on equipment.
Where ammonia makes sense
Ammonia suits concentrated industrial loads — typically several hundred kilowatts and above on one site — with a dedicated plant room and staff able to operate it. It has zero GWP and zero ozone impact and its thermodynamic properties give strong efficiency at low temperatures.
It is less suitable for small distributed systems, occupied retail spaces or sites without maintenance capability.
System architectures
Different architectures trade charge size, efficiency and complexity.
- Pumped liquid overfeed: robust, common in large cold stores; larger charge
- Low-charge / DX ammonia: reduced inventory, suits sites with charge concerns
- NH₃/CO₂ cascade or ammonia with CO₂ brine: keeps ammonia in the plant room only
- Ammonia chillers with glycol secondary loops for process or occupied areas
Safety and compliance essentials
Codes such as EN 378, ISO 5149 and IIAR 2/9 (where applicable) govern machinery room ventilation, gas detection, emergency shut-off, pressure relief and documentation. Local rules and insurers may add requirements.
Ask bidders to state which codes their design follows and what operator training, process safety documentation and emergency procedures are included.
Comparing ammonia bids
Price differences between ammonia bids usually come from scope, not equipment.
- Refrigerant charge estimate and how it was minimised
- Compressor type, count and part-load control
- Condenser type (evaporative, adiabatic, air-cooled) and water use
- Heat recovery offered and its expected use
- Commissioning, training and after-sales service terms
Figures and ranges here are general engineering guidance, not quotes. Final design, pricing and compliance are set by the independent suppliers and contractors ColdMatch introduces after reviewing your project.
Share your design basis once. ColdMatch reviews it before identifying suitable independent suppliers or EPC contractors.
Request project quotesModernising an existing ammonia plant?
Ammonia plant upgrades combine efficiency, capacity and safety questions. Treat safety and regulatory obligations as requirements to confirm with qualified specialists, not as marketing claims; ColdMatch does not certify compliance.
- What typically triggers an ammonia plant upgrade?
- Ageing compressors or vessels, capacity growth, high energy use, a desire to reduce charge, controls obsolescence, or findings from safety and mechanical-integrity reviews.
- Does a change to the plant need a safety review?
- In many jurisdictions changes to covered ammonia systems require management-of-change and hazard review procedures. Confirm the rules that apply to your site and charge with your safety engineer.
- Retrofit the existing plant or move to low-charge?
- Compare lifecycle cost, charge reduction, downtime and the condition of existing pipework and machinery room. Low-charge or packaged options can suit staged replacement.
- Modernising an existing ammonia plant
- Existing facility upgrade hub
- Retrofit or replace framework
- Diagnose bottlenecks
- Upgrade ROI assumptions
R404A, R134a, R410A and R22 — replacement paths, dated deadlines, retrofit cost and payback ranges in one place.
When is ammonia refrigeration the right choice?
Ammonia (R717) is widely used for large, continuous industrial duties — cold storage warehouses, food processing, breweries, dairy and distribution — where a machinery room, gas detection, trained operators and compliance with EN 378, IIAR or local practice can be provided. There is no universal size threshold. Where charge limits, urban siting or maintenance skills are constraints, low-charge packaged NH₃ or an NH₃/CO₂ cascade may fit better; compare options on supplier-stated energy use at your design conditions.
How is an ammonia plant sized and priced?
Sizing follows duty per temperature level, ambient design conditions, product load and operating hours; price then follows compressor type and count, vessels, evaporative or air-cooled condensers, pipework runs, safety systems, controls, plantroom civils, installation and commissioning. Redundancy (N+1) and heat recovery are significant cost variables that should be defined before RFQ.
What information is needed to quote an NH₃ plant?
Cooling duty per suction level, room or process temperatures, ambient conditions, plantroom location and space, power supply, redundancy expectation, heat-recovery targets, applicable safety code and available maintenance capability on site.
- •300 kW–1 MW single-stage industrial plant
- •1–3 MW two-stage plant for frozen storage
- •3 MW+ central plant with heat recovery and N+1
Exact system sizing depends on required temperature, ambient climate, product load and turnover rate, door openings, insulation specification, storage duration, redundancy level and operating hours. ColdMatch does not manufacture equipment — we help industrial buyers compare suitable suppliers and technologies against project-specific technical and commercial requirements.
From guide to calculator to request
- 1. Read the guide
Understand scope, standards and the trade-offs that drive cost before you size anything.
- 2. Estimate with your own inputs
Free calculators give planning-level figures only. Enter your own dimensions, temperatures, tariff and efficiency values.
- 3. Submit a reviewed RFQ
The ColdMatch team reviews your brief, contacts suitable suppliers on your behalf and presents organised responses. Free for buyers; projects from USD 250,000.
What do buyers need before requesting quotes?
Location, application and product, temperature range, capacity and throughput, power availability, preferred refrigerant if fixed by policy, budget range and target date. A complete brief gets more comparable responses.
How are qualified providers considered?
Manufacturers, cold-room builders and integrators share their capabilities with ColdMatch. When a reviewed buyer project fits their technology, size range and region, the team may contact them. No public listings, no direct buyer contact and no guaranteed leads. For suppliers
Calculator method notes state their formulas and reference sources on each tool page. Results are planning estimates, not quotes or designs; final sizing, refrigerant choice and safety design must be reviewed by a qualified refrigeration engineer. Path reviewed 13 Oct 2026.
- •Country, project location and site status (greenfield or existing building)
- •Application and product stored or processed
- •Required temperature range and any humidity requirement
- •Storage capacity (m², m³ or pallet positions) and daily throughput
- •Ambient/design climate conditions at site
- •Available power supply and backup or redundancy requirement
- •Preferred refrigerant, if already defined by policy or regulation
- •Indicative budget range and target commissioning date
Cold room, warehouse, blast/IQF freezing or ammonia plant: which project is yours?
These four get mixed up in searches and in RFQs, but each is scoped and sized differently. Name the project type first, then brief suppliers in the unit that fits it.
Cold room
One insulated room, often built inside an existing building, cooled by packaged or split refrigeration units.
Sized by: Internal volume (m³) or pallet positions, plus daily product intake.
Cold-storage warehouse
A whole temperature-controlled building: insulated envelope, several temperature zones, loading docks, racking and usually a central refrigeration plant.
Sized by: Pallet positions per zone and daily throughput (pallets in and out).
Blast or IQF freezing
Equipment that freezes product quickly: batch blast rooms or tunnels, or continuous IQF freezers for individual pieces. It sits before frozen storage; a store holds product that is already frozen.
Sized by: Kilograms per hour or tonnes per day, with product entry and target temperatures and freezing time.
Ammonia (NH₃) refrigeration plant(this page)
A refrigeration system type, not a building type: a central plant using ammonia (R717) that can serve warehouses, processing halls and freezers.
Sized by: Refrigeration duty in kW for each temperature level, at stated site conditions.
Whichever type it is, the refrigeration plant that serves it is compared on industrial refrigeration systems.
RFQ checklist: six things every quote request needs
- Temperature range. Storage or process setpoint and tolerance for each zone; for freezing, the product's entry temperature and target core temperature.
- Capacity. In the unit that fits the project type — m³, pallet positions, kg/h or t/day, or kW of refrigeration duty — plus daily intake and peak season.
- Refrigerant and compliance requirements. Preferred or excluded refrigerants, client or site rules (for example food-safety or medicines distribution requirements) and the codes your engineer wants the design checked against.
- Site. Country and location, outdoor design conditions, available power, existing building or new build, access and space for plant.
- Project stage. Concept, budget, design, tender, replacement or expansion; target dates; and whether funding is approved.
- Service scope. Supply only, supply and install, design-and-build or full EPC; and whether commissioning, training, maintenance and spares should be priced separately.
ColdMatch does not provide engineering design. Refrigerant choice, charge limits, machinery-room design, pressure-system examination and hazardous-area assessment are set for each site by a competent refrigeration engineer under the rules that apply there. Official UK starting points (checked 31 October 2026): GOV.UK — F gas in refrigeration, air conditioning and fire protection systems; HSE — COMAH technical measures: refrigeration; HSE — Pressure systems: a brief guide to safety (INDG261).
Free for buyers, for projects from USD 250,000. The ColdMatch team reviews your request, contacts suitable suppliers on your behalf and presents their responses through ColdMatch. Smaller projects can use the free calculators above.
Planning answers
- What is the difference between a cold room and a cold-storage warehouse?
- A cold room is a single insulated enclosure, often inside an existing building, cooled by packaged units and sized in m³ or pallet positions. A cold-storage warehouse is a whole temperature-controlled building with several zones, loading docks, racking and usually a central refrigeration plant, sized by pallet positions and daily throughput.
- Is blast freezing the same as frozen storage?
- No. Blast and IQF freezers remove heat quickly to bring warm product down to frozen temperature. Frozen storage then holds product that is already frozen. Freezers are sized by kg/h or tonnes per day; stores by volume or pallet positions.
- When is ammonia used in industrial refrigeration?
- Ammonia (R717) is commonly used for large, continuous duties in cold-storage warehouses, food processing and freezing, where a machinery room, gas detection and trained operators can be provided. It is toxic, so safety requirements are significant and set per site. There is no universal size threshold; low-charge ammonia, ammonia/CO₂ cascade and CO₂ systems are alternatives to compare at your design conditions.
- What should a refrigeration equipment RFQ include?
- At minimum: temperature range, capacity in the right unit, refrigerant and compliance requirements, site conditions, project stage and the service scope you want priced. Bids are only comparable when every supplier prices the same brief.
Read the full buyer comparison — COP, safety, refrigerant cost, climate suitability and CAPEX — before you brief suppliers.
Ammonia plant rules: official references to check
Ammonia is not a fluorinated gas, so F-gas quota rules do not apply to it, but its toxicity and operating pressures bring their own safety regulation. These official pages are starting points for the buyer and their engineer — not legal advice, and not a statement that any proposal complies. Links checked 29 October 2026.
- Great Britain · HSECOMAH technical measures — refrigeration
Failure modes and prevention, control and mitigation measures for refrigeration systems at major-hazard sites.
- Great Britain · HSEPressure systems: a brief guide to safety (INDG261)
Duties under the Pressure Systems Safety Regulations 2000, including written schemes of examination.
- Great Britain · HSEDSEAR in detail
Risk assessment for dangerous substances, including hazardous-area zoning around releases.
- European Union · EUR-LexRegulation (EU) 2024/573 on fluorinated greenhouse gases
Restricts high-GWP F-gases in new equipment; relevant when comparing ammonia with HFC/HFO options.
Frequently asked questions
How ColdMatch Group works — independent B2B procurement and sourcing platform — ColdMatch Group is an independent B2B procurement and sourcing platform for industrial refrigeration, cold storage and cold-chain projects from USD $250K+, where the ColdMatch team reviews each buyer brief, contacts suitable third-party suppliers on the buyer's behalf and organizes their responses.
Explore every ColdMatch buying guide
RFQ checklist, cost benchmarks, and country-by-country buying guides — all in one hub.
Back to Guides HubTake this to a structured refrigeration RFQ
Refrigeration bids are only comparable when refrigerant, duty, evaporating temperature, redundancy and controls are specified. Qualify the design intent, then issue one RFQ.
Supplier-neutral. Free for buyers and project owners. Best suited to commercial projects from USD $250,000.