Next generation CO2 systems presented at ATMOsphere Europe 2013

By Janet Thompson, Sep 12, 2013, 11:02 5 minute reading

The ATMOsphere Review Panel has made its first round selection of commercial refrigeration case studies to be presented at ATMOsphere Europe 2013. Advansor, Carel, Danfoss, Frigo Consulting, the Danish Technological Institute and Emerson Climate Technologies will present real-life examples of some of the most advanced transcritical CO2 systems for supermarkets and convenience stores available today with various examples working efficiently in warm climates.

This year, ATMOsphere Europe 2013 will feature 6 innovative case studies focusing exclusively on commercial refrigeration applications. The Commercial Refrigeration Case Studies Session will take place on Wednesday, October 16th. Next week, additional case studies selected for the heat pump, industrial refrigeration and air-conditioning technology case study session will be announced. 

Integrated CO2 booster for high-efficiency cooling, heating and air-conditioning by Jens Kallesoe, Advansor

Advansor’s case study presents the compSUPER Sigma transcritical CO2 booster system, a revolutionary system combining cooling and frost, parallel compression, heat recovery and AC. The integrated system was delivered to a Coop supermarket in Töcksfors, Sweden in February 2013, where it’s unique design is able to satisfy the store’s multiple needs while ensuring lowest possible power consumption.
With the new compSUPER Sigma concept, Advansor integrates cooling, frost, heat recovery and AC into a single plant. The feedback on the delivered compSUPER Sigma system in Sweden has been very positive, especially regarding performance. The innovative system applies technology improvements according to market demand, demonstrating a commitment to both the customer and the technology itself,” says Advansor Sales Director, Torben M. Hansen.

CO2 integrated systems for warm climates by Diego Malimpensa, Carel Industries S.p.A.

Focusing on applications for warmer climates, Carel presents a project which combines traditional CO2 booster system technology with a number of evolutions including advanced heat recovery systems, parallel compressors and comprehensive air conditioning integrated into one system. Full integration and optimisation were achieved with synergic control of all regulation loops with a single controller.
Our case study highlights an example in Germany where a single CO2 unit is capable of managing efficient air-conditioning and heating, as well as low and medium temperature refrigeration loops. It is one of the most advanced systems in the world right now, demonstrating a significant reduction in energy consuption and higher performances in warmer climates,” explains Diego Malimpensa, Application Manager – Retail Solutions at Carel Industries S.p.A.

The CO2 'dream solution' for a supermarket - a concept case by Torben Funder-Kristensen, Danfoss

The presentation will focus on a supermarket in Norway that has been established as part of the Creative project. The supermarket utilises an advanced 100% CO2 solution and various heat reclaim facilities. The installation combines heating and ventilation and deep drilled vessels to optimize efficiency. The store opened in summer 2013 and is running in all aspects. The presentation will provide an in depth description of the store’s refrigeration & HVAC system build up, focusing also on the controls used in the concept. It will discuss the challenges faced in controlling the system and present ideas about the next steps.

Advanced CObooster system for warm climates by Jonas Schönenberger, Frigo-Consulting AG

A recently modernised supermarket in Switzerland, part of a renowned supermarket chain, is equipped with groundbreaking technology. Measurements of the advanced booster-system in the commercial refrigeration application provides useful information about the operation and shows an efficiency increase of 15%. In warmer climates, even higher efficiency increases are expected.
I see a high potential for this technology in different application fields, due to the simple integration into the CO2 refrigeration system and the enormous efficiency increase thereby,” says Jonas Schönenberger, Research & Development at Frigo-Consulting AG.

Improving efficiency for small transcritical CO2 supermarket installations by Christian Heerup, Danish Technological Institute (DTI)

Focusing on applications for small supermarkets, the case study assesses the potential for improving the efficiency of CO2 systems by undertaking a project involving a transcritical CO2 supermarket installation in Denmark. The load profiles for the refrigeration system were established by one year of logging temperatures, pressures and refrigerant mass flow in the refrigeration cabinets. Using this data, DTI has identified methods for improving the efficiency of the system.
First tests show savings of 9% by managing the loads of the refrigeration system instead of just managing compressor capacity. The operation of a supermarket installation has been analysed and avoidance of system oscillations seems to be the way to improve efficiency and explain an apparent potential for savings of 20 to 25%” explains Christian Heerup, Product Manager – Refrigeration and Heat Pump Technology, Energy and Climate at the Danish Technological Institute.

CO2 booster for convenience stores using mixed scroll/piston compressor technology by Sylvain Lamy, Emerson Climate Technologies GmbH

The case study reports on a joint project to develop a small and compact CO2 booster refrigeration system for a convenience store chain in the UK. The study focuses on the main criteria that determine the feasibility of transitioning to CO2 for small convenience stores: cost parity with current HFC systems, compactness, low noise requirements imposed by the application itself and better energy efficiency. To solve these challenges, Emerson Climate Technologies teamed up with Space Engineering to develop a CO2 booster pack dedicated to convenient store applications. It is the first CO2 booster system to mix scroll and semi-hermetic compressor technologies and allows for significant cost reductions compared to traditional booster systems and an improved level of efficiency.

The CO2 scroll, Digital scroll modulation, pre-installed semi-hermetic compressor protection devices and on-board electronics, allow the system to compete with standard HFC Systems meaning convenience store operators can afford to make the transition to CO2. This newly designed CO2 Booster Pack has been tested in Puckelchurch (UK) from November 2012 to July 2013 and is now in serial production. The first sites are being commissioned in various locations in the UK, says Sylvain Lamy, Marketing Manager Refrigeration Compressors at Emerson Climate Technologies.

About ATMOsphere Europe 2013
15 & 16 October 2013 at the Crowne Plaza Le Palace Hotel in Brussels, Belgium

The 5th annual ATMOsphere Europe conference brings together around 200 participants including leading suppliers, end-users, government representatives, associations and more. In addition to providing an exclusive and in-depth look at the upcoming F-gas regulations, the event also dedicates several sessions to commercial refrigeration with panel discussion and presentations involving key supermarket chains, retail brands and system suppliers.

View full ATMOsphere Europe 2013 programme:

Register for ATMOsphere Europe 2013

For general information about the conference, please visit


By Janet Thompson

Sep 12, 2013, 11:02

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