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Field Measurements and Performance Evaluation of CO2 Supermarket Refrigeration Systems
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-2895-774X
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
(Energi & Kylanalys)
2013 (English)In: 2nd IIR International Conference on Sustainability and the Cold Chain. Proceedings: Paris, France, April 2-4, 2013, 2013Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

This paper studies field measurements and performance analysis of eight supermarkets in Sweden amongwhich five supermarkets use CO2 and three use HFC as the refrigerant. The differences in system design arediscussed and detailed performance evaluation of one of the systems is presented. The performances of allthe supermarkets are compared and the reasons for higher or lower energy efficiency are discussed. Somekey components of CO2 systems are evaluated, as well.According to the results, the older CO2 systems have lower COP than the reference systems. High vapourfraction in low temperature cabinets inlet, relatively high amount of internal and external superheating and10-15% lower overall efficiency of low temperature compressors compared to the other systems are some ofthe main reasons for this lower COP. But, the newer CO2 systems proved to have higher efficiency, or atleast, as energy-efficient as the conventional systems. This originates from the modification in the systemdesign and more efficient components. System design modification includes two-stage expansion by receiverand flash gas by-pass. The newer CO2 components have higher efficiency; medium temperature levelcompressors have 5-10% higher overall efficiency compared to HFC and older CO2 compressors and thecabinets run with lower superheating so the system can be controlled to run at higher evaporationtemperatures.This study shows that CO2 systems have comparable COP to advanced conventional systems applied in Sweden.

Place, publisher, year, edition, pages
2013.
Series
Science et Technique du Froid, ISSN 0151-1637
Keyword [en]
co2, hfc, performance, r744
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-175690ISBN: 9782913149977 (print)OAI: oai:DiVA.org:kth-175690DiVA: diva2:861921
Conference
2nd IIR International Conference on Sustainability and the Cold Chain; Paris, April 2-4, 2013
Funder
Swedish Energy Agency
Note

QC 20151216

Available from: 2015-10-19 Created: 2015-10-19 Last updated: 2017-03-30Bibliographically approved

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Karampour, Mazyar

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CiteExportLink to record
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