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Field measurements of supermarket refrigeration systems: Part I: Analysis of CO2 trans-critical refrigeration systems
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-2895-774X
2015 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 87, 633-647 p.Article in journal (Refereed) Published
Abstract [en]

This study investigates the refrigeration performance of three CO2 trans-critical solutions based on field measurements. The measurements are carried out in five supermarkets in Sweden. Using the field measurements, low and medium temperature level cooling capacities and COP's are calculated for ten-minute intervals, filtered and averaged to monthly values. The results indicate that the systems using trans-critical booster system with gas removal from the intermediate vessel have relatively the highest total COP. The reasons are higher evaporation temperatures, lower internal and external superheat and higher total efficiency of booster compressors. Another important factor is gas removal from the intermediate vessel which leads to higher COP of low temperature level. Comparing the older and newer installed systems, a trend in energy efficiency improvement has been seen. The study shows this improvement originates from both changes in the system design (e.g. two stage expansion) and components efficiency improvement (e.g. higher total efficiency of compressors - lower internal superheat and higher evaporation temperatures of cabinets).

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 87, 633-647 p.
Keyword [en]
Carbon dioxide (CO2), Supermarket refrigeration, Trans-critical cycle, Field measurements
National Category
Energy Engineering
Research subject
Energy Technology
URN: urn:nbn:se:kth:diva-172808DOI: 10.1016/j.applthermaleng.2015.05.052ISI: 000359504500064ScopusID: 2-s2.0-84931268235OAI: diva2:849661

QC 20150831

Available from: 2015-08-30 Created: 2015-08-30 Last updated: 2015-11-13Bibliographically approved

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