Innovative commercial refrigeration case studies to take the stage at ATMOsphere Europe 2015

By Pilar Aleu, Feb 18, 2015, 18:22 5 minute reading

The case study selection for ATMOsphere Europe 2015 has officially been announced. Leading companies and research institutes including Advansor, CAREL, Danfoss, Frigo-Consulting, SINTEF and DTI will present their latest projects and products covering a range of topics such as parallel compression, ejector technology, BLDC waterloops systems, CO2 condensing units and more. A key focus will be on applications in warmer climates in Southern Europe.

The ATMOsphere Review Board has announced its case study selection for the upcoming ATMOsphere Europe 2015, which will take place on 16 & 17 March in Brussels, Belgium. The event will serve as a forum for leading HVAC&R industry stakeholders to discuss and learn more about the latest natural refrigerant technology innovations, market trends and regulatory issues. The following case studies have been chosen for the Commercial Refrigeration Technology Case Studies Session at the conference.

Commercial refrigeration

Transcritical CO2 retail technologies taking Southern tracks by Torben Hansen, Advansor

The new F-gas regulation has put the pressure on end users to find low GWP alternatives. While transcritical CO2 has been proven in Northern Europe, where lower energy consumption and attractive ROI are no longer debated, the challenge remains in proving the solution suitable for the Southern European Region.

From a technical perspective, a wide range of CO2 technologies are already on the radar for Southern European applications: parallel compression, mechanical sub cooling and various techniques incorporating ejectors. While most are well described in available literature, only few field tests have been published so far. Some Southern European end users have doubts about what their future design and refrigerant strategy will look like. During 2014, Advansor built 10 systems with different designs for operation in Romania, Italy and Spain. This case study presentation will evaluate these different designs on both complexity and energy performance.

BLDC waterloop systems in commercial refrigeration: the new frontier for natural refrigerants by Diego Malimpensa, CAREL

A BLDC waterloop system for commercial applications is a simple system in which each cabinet has its own small refrigeration system (self-contained) with a dedicated modulating compressor. Thanks to BLDC rotary/scroll compressors, energy efficiency levels are drastically improved compared to standard applications with compressor racks and remote cabinets.
CAREL is now adding the benefits of natural refrigerants to the system, pioneering the research and testing of the BLDC waterloop system with propane and CO2. The case study will present data from sites running with R410A and will compare them with lab tests done with propane and CO2.

Barriers and opportunities for selection of best low GWP technologies by Torben Funder-Kristensen, Danfoss

This case study will discuss factors influencing the choice of CO2 technology (short term – long term parameters) and potential pitfalls beyond the F-Gas Regulation (obey bans but sacrifice energy efficiency). It will provide a comparison between low GWP solutions for supermarkets (6 different ways to fulfil the demands of the ban) and highlight cases to show the available opportunities (heat recovery + results on ejector technology test sites). Factors influencing the technology choice are important to discuss because the energy agenda is also shifting alongside with the introduction of new refrigerants. There is a risk that more short-term solutions will be chosen, thus missing out on the opportunities for higher efficiencies.

CO2 refrigeration system for tropical region by Erik Wiedenmann, Frigo-Consulting

Since the beginning of November 2014, groceries at the Migros branch in Ibach, Switzerland have been cooled at evaporation temperatures of -2°C resp. -25°C, compared with conventional refrigerating units with average values of -8°C and -33°C. These extremely high temperature levels in commercial refrigeration are setting new benchmarks worldwide. During the remodelling of the supermarket, an advanced CO2 refrigeration system was installed, which supplies 170 metres of medium and low temperature cabinets and 280m2 of cold rooms and freezers with cooling capacity. Two identical CO2 booster units provide an unprecedented total of 250 kW of refrigerating capacity. After one year of operation, the facility has achieved an increased of efficiency of at least 25%.

Italian supermarket: R744 multiejector enhanced parallel compression system by Armin Hafner, SINTEF Energy Research

Focusing on developments in regards to increasing efficiency of R744 commercial refrigeration systems, the use of expansion work in combination with flooded evaporators has shown itself to be key in outperforming conventional H(C)FC systems even in high ambient temperatures. A new supermarket located in the Trento province in Italy was commissioned in September 2014. The supermarket is equipped with an ejector supported R744 parallel compression unit, which is also able to perform 100% of the AC load supplied with the ventilation system. This case study will describe the system and first measurements. It will also provide a comparison of various R744 ejector technologies applied in supermarkets.

CDUs with CO2 seen in the light of the F-Gas and ECO design directives by Christian Heerup, Danish Technological Institute

While the performance of CO2 condensing units (CDUs) for larger installations has been verified and reported on several times with very good results, it has been speculated that smaller units might have problems with meeting the efficiency levels of their HFC competitors. Addressing this issue with a minimum level for the seasonal efficiency (SEPR) for CDUs, the ECO design directive is expected to enter into force starting the 01 July 2015. A project supported by the Danish EPA concerning CO2 CDUs has facilitated the first test of the SEPR of a medium temperature CO2 CDU at the Danish Technological Institute (DTI). This first generation CO2 CDU from the Danish manufacturer Advansor exceeds the minimum level and meets the second threshold level expected to be enforced in 2018. This result will be compared to the calculated values for HFC CDUs and the potentials and the challenges will be discussed.

To read the full abstracts for the case studies listed above, as well as for case studies selected for other applications, please have a look at the following articles:

First round of case studies selected for ATMOsphere Europe 
New round of case studies selected for ATMOsphere Europe 
ATMOsphere review board announces final case study selections

General information about the conference can be found at To register for the event, please visit


By Pilar Aleu

Feb 18, 2015, 18:22

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