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CO2 has a high volumetric capacity and a good heat transfer performance but a disadvantage in terms of the coefficient of performance (COP) at high gas cooler temperatures. The reasons are the thermodynamic losses during the throttling process and the high discharge temperatures. The high pressure levels in such a system are a further disadvantage. In our laboratory a piston expander-compressor-unit has been developed and tested to improve the CO2 system COP. Our latest prototype has been integrated in two supermarket refrigeration systems. These first field tests started in a Swiss cash & carry market as well as in an experimental plant with a demo market. In this publication operational experiences and test results at suband transcritical conditions are presented.
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Details
- Original title: CO2 expander-compressor-unit (ECU) in refrigeration systems.
- Record ID : 30004432
- Languages: English
- Source: 10th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2012). Proceedings. Delft, The Netherlands, June 25-27, 2012.
- Publication date: 2012/06/25
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COP improvement of a CO2 refrigeration system w...
- Author(s) : WENZEL M., HESSE U.
- Date : 2012/07/16
- Languages : English
- Source: 2012 Purdue Conferences. 14th International Refrigeration and Air-Conditioning Conference at Purdue.
- Formats : PDF
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Assessment of energy efficiency and operating p...
- Author(s) : HUDJETZ S., KOHLER P., BECKER M.
- Date : 2020/12/07
- Languages : English
- Source: 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2020). Proceedings. Kyoto, Japon, December 7-9th 2020.
- Formats : PDF
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R744 refrigeration technologies for supermarket...
- Author(s) : HAFNER A., HEMMINGSEN A. K.
- Date : 2015/08/16
- Languages : English
- Source: Proceedings of the 24th IIR International Congress of Refrigeration: Yokohama, Japan, August 16-22, 2015.
- Formats : PDF
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Energy cost analysis of heat recovery in CO2 su...
- Author(s) : FIDORRA N., HAFNER A., NEKSÅ P., et al.
- Date : 2015/04/16
- Languages : English
- Source: 6th Conference on Ammonia and CO2 Refrigeration Technology. Proceedings: Ohrid, North Macedonia, April 16-18, 2015.
- Formats : PDF
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Efficiency analysis and comparison of innovativ...
- Author(s) : WIEDENMANN E., SCHOENENBERGER J., BAERTSCH M.
- Date : 2014/08/02
- Languages : English
- Source: 11th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2014). Proceedings. Hangzhou, China, August 31-September 2, 2014.
- Formats : PDF
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