Case Study: R290 partners with CO2 for efficient industrial cooling

By Janet Thompson, Sep 19, 2013, 16:30 3 minute reading

Schiessl’s cascade CO2/R290 system for hop cooling has proven significant gains in decreasing power consumption compared to an R404a system. This is just one of the projects that will be presented during the Technology Case Study Session of the upcoming ATMOsphere Europe 2013. 

This year, the ATMOsphere Review Panel selected over 15 of the most innovative natural refrigerant case studies to be presented at ATMOsphere Europe 2013. One of the selected case studies gives provides an in depth look at a CO2/Propane cascade system used for industrial cooling.

CO2 and Propane – two efficient partners for industrial cooling by Robert Baust, Schiessl

Since November 2012, the cascade CO2 and R290 unit Schiessl took into commission has been running fault free and has shown noticeable reduction in power consumption when compared to the predecessor unit, which used R404A. The unit’s duty is 140 kW for brine at -37°C, which is used for the industrial process of hop cooling. It is designed as a compressor rack with three Bitzer reciprocating compressors at each stage. To keep operational and investment costs low, heat exchangers were integrated for subcooling the R290 and desuperheating the R744. Electronic expansion valves and frequency inverters for the compressor and condenser were also employed. This basic design can be used as a model for any cooling duty by brine or direct expansion between -25°C and -48°C.

Additional case studies at ATMOsphere Europe 2013

  • Efficient road transport refrigeration unit using CO2 by Sebastien Lemoine, Carrier Transicold
  • Natural refrigerants with high pressure compressors in industrial plants by Robert Sossi, Mayekawa
  • Plate freezers aboard fishing vessels using CO2 and ammonia by Mads Sigsgaard, DSI
  • Delivering 90°C district heat from the fjord with zero emissions and zero GWP by Dave Pearson, Star Refrigeration
  • Thermal compression of CO2 to reduce boiler consumption by half by Luc Jacquet, boostHEAT

To read a full description of the case studies selected for the Heat Pump Session and the Industrial, Transport Refrigeration & Other Applications Session, on the event website, click here

  • Integrated CO2 booster for high-efficiency cooling, heating and air-conditioning by Jens Kallesoe, Advansor
  • CO2 integrated systems for warm climates by Diego Malimpensa, Carel Industries S.p.A.
  • The CO2 'dream solution' for a supermarket - a concept case by Torben Funder-Kristensen, Danfoss
  • Advanced CO2-booster-system for warm climates by Jonas Schönenberger, Frigo-Consulting AG
  • Improving efficiency for small transcritical CO2 supermarket installations by Christian Heerup, Danish Technological Institute (DTI)
  • CO2 booster for convenience stores using mixed scroll/piston compressor technology by Sylvain Lamy, Emerson Climate Technologies GmbH

To read a full description of the case studies selected for the Commercial Refrigeration Session on the event website, click here

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

Once again, around 200 HVAC&R industry experts will come together at the 5th annual ATMOsphere Europe 2013: Natural Refrigerants – Solutions for Europe. One of the main features of this year’s conference is an exclusive and in depth look at the new F-Gas regulations with in put from representatives of the European Institutions, as well as national governments. In addition to sessions on policy developments and market trends, ATMOsphere Europe 2013 also features several parallel case study sessions focusing on the latest natural refrigerant technologies and projects in the areas of industrial, commercial and transport refrigeration, air- conditioning, heat pumps and more.

View the full ATMOsphere Europe 2013 programme:

Register for the event:

For general information about ATMOsphere Europe 2013, please visit the event website at


By Janet Thompson

Sep 19, 2013, 16:30

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