Complete Multi Ejector portfolio for all store sizes, CO₂ systems and climates
The high-pressure ejector utilizes the energy in the high-pressure gas to lift gas from the medium-temperature (MT) suction side to the parallel compressors (IT), effectively reducing the load on the main compressor. The lifted gas is then compressed by the parallel compressors, which improves overall system efficiency and performance.
- For CO₂ refrigeration systems with parallel compression
- The best solution for warm climates
- Optimum for system sizing from 150 kW and up
The low-pressure ejector recovers expansion energy for booster systems, which would be otherwise lost in expansion, to lift the suction pressure. This leads to a decrease in energy consumption and greenhouse gas emissions by reducing the workload of the compressors.
- For CO₂ booster systems
- The best solution for warm climates
- Optimum for system sizing from 40-150 kW
The Liquid Ejector utilizes the energy in the high pressure gas to efficiently lift liquid as it flows from the suction accumulator. Working in combination with CO₂ Adaptive Liquid Management, it ensures full evaporator utilization, optimizes performance, and reduces energy consumption.
- For both CO₂ booster systems and systems with parallel compression
- Efficient in both warm and cold climates
- Optimum for system sizing from 40-450 kW
The system operates efficiently in both warm and cold climates.
The Combi HP/LE combines the benefits of the High Pressure Ejector and the Liquid Ejector, providing a complete solution that is easily installed with only one welding point required—streamlining setup and ensuring efficient operation of CO₂ systems. This combined solution also helps reduce maintenance costs over the system's lifespan due to its durable, low-wear design.
- For CO₂ refrigeration systems with parallel compression
- The best solution for warm climates
- Optimum for system sizing from (40 to 105 kW)
How to choose the right Multi Ejector Solution™
Three main factors to consider when designing your transcritical CO₂ system with a Multi Ejector Solution™.
For further guidance in component selection, use the Coolselector®2 tool.
Warm ambient temperatures
Historically, CO₂ system efficiency has been a challenge in warm ambient temperatures. With the Multi Ejector Solution™ the equator has been eliminated.
Cold ambient temperatures
CO₂ is already widely used due to the optimum working conditions.
- Parallel compression, Multi Ejector – High pressure
- Booster system, Multi Ejector – Low pressure
- Booster or parallel compression, Multi Ejector – Liquid ejector
- Shop: ~40 kW cooling capacity
- Minimarket: ~75 kW cooling capacity
- Supermarket: ~150 kW cooling capacity
- Hypermarket: ~300 kW cooling capacity
This whitepaper explores how the Multi Ejector HP solution helps supermarkets achieve up to 21% energy savings in CO₂ refrigeration systems through advanced ejector technology, parallel compression, reduced compressor wear and reliable performance across varying climates.
Learn more
With the world’s population expected to reach 10 billion people by 2050, sustainable food retail and storage are more important than ever. Yet this is an often-overlooked step in the decarbonization of society.
The Danfoss Smart Store in Denmark cut emissions by up to 68% using natural refrigerants, heat recovery, and solar power. See how innovation is driving greener food retail in the full report.
We have collected all our products and solutions for CO₂ and equipped each with a unique code number for easy reference, so you can explore our CO₂ solutions effortlessly.
Product range
AK-CC55 is designed with user experience in focus, resulting in bigger connectors and AK-CC55 Connect app. The AK-CC55 platform consist of 4 controllers. AK-CC55 Compact is a standard case controller for TXV/EEV. AK-CC55 Single Coil/UI is an advanced case controller for EEV with adaptive algorithms. AK-CC55 Multi Coil is an advanced case controller controlling from 1 to 3 EEV’s in same refrigeration section.
The Danfoss AK-System Manager (AK-SM) is a modern solution for the food retail markets. The AK-SM uses the latest technology to provide the maximum benefit to the end user, both in terms of energy saving optimization, control options and user friendly access.
Refrigeration pressure transmitters are used for commercial air-conditioning and for commercial and industrial refrigeration applications. They are made in stainless steel to be compatible with fluorinated and natural refrigerants and laser welding with no soft seals ensure hermetic tightness for decades.
The Danfoss Multi Ejector Solution™ ensures that transcritical CO₂ applications for retailers become energy efficient in any climate.
Documents
Learning
On-demand webinar hosted by Danfoss' Mark Sever. This time Mark focuses on CO₂ transcritical high-pressure applications including CCMT valves and Multi Ejector Solutions in Coolselector®2.
Watch the on-demand CO₂ transcritical high pressure applications webinar now!
On-demand webinar hosted by Danfoss' Mark Sever. This time Mark focuses on Multi Ejector Solutions in Coolselector®2.
Watch the on-demand Multi Ejectors webinar now!
Videos
Watch our videos about the Multi Ejectors and how they work. For example, the videos will explain how high-pressure refrigerant passes through the nozzle, converting pressure energy into kinetic energy, and reaching high velocity. As the velocity increases, the pressure decreases, creating the suction effect that draws in lower-pressure refrigerant – demonstrating the core fluid dynamics behind the Danfoss Multi Ejector operation.
Case studies
Danfoss offers a complete portfolio of gas and liquid ejectors that provide significant benefits in CO2 refrigeration applications. Here we take a closer look at these offerings: the Multi Ejector Low Pressure (LP), the Multi Ejector High Pressure (HP), and the Liquid Ejector (LE). All three ejector products are only available as a complete Multi Ejector Solution™ where the ejector is bundled with the AK-PC 782A pack controller to provide the robust system controls necessary for efficient and reliable operation.
Danfoss has pioneered two control algorithms that help you achieve this balance. The Minimum Stable Superheat (MSS) algorithm has been an important part of the Danfoss ADAP-KOOL® offering for years and is still the ideal choice for adaptive evaporator control for dry expansion. Now Danfoss introduces the next generation: Adaptive Liquid Control (ALC).
Intelligent control solutions are important for achieving reliable, optimized operation and realizing financial savings and environmental
benefits in your transcritical CO2 refrigeration solution.
In Voskresensk, Russian retailer Magnit has opened the first hypermarket in Russia using a transcritical booster refrigeration system with carbon dioxide (CO₂) — an eco-friendly and natural refrigerant.
The F-gas regulation in Europe and similar legislation in other parts of the world push for low-GWP solutions in food retail refrigeration. CO₂ is proving to be one of the most efficient low-GWP refrigerants thanks to the unique properties of the gas combined with technological discoveries that pave the way for optimum utilization of these properties.