Yıl 2017, Cilt 20, Sayı 4, Sayfalar 220 - 227 2017-11-29
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## Thermodynamic Performance Assessment of a CO2 Supermarket Refrigeration System with Auxiliary Compression Economization by using Advanced Exergy Analysis

#### Paride Gullo [1] , Armin Hafner [2]

##### 156 182

Supermarkets are currently one of the most vital service facilities, whose number of installations is ever-growing in both developed and developing countries. On the other hand, these applications feature a copious indirect contribution to the ongoing climate change, as well as a massive use of potent greenhouse gases. In an attempt to promote climate-friendlier technologies in commercial refrigeration sector, “CO2 only” (transcritical CO2 or pure CO2) refrigeration systems have become the mainstream of new food retails worldwide. In particular, in the last few years parallel (or auxiliary) compression has taken root in food retails as a means to enhance the energy efficiency of pure CO2 units. The thermodynamic performance of such a promising solution can be suitably assessed with the aid of the advanced exergy analysis.

The results obtained at the design outdoor temperature of 40 °C showed that the main compressor has the highest priority of enhancement, whereas the high-pressure expansion valve needs to be replaced with a device for expansion work recovery. Also, close attention had to be paid to both the gas cooler and the auxiliary compressor. The former can be improved mainly by enhancing the other components, whereas the irreversibilities related to the latter can be decreased by improving both the compressor itself and the remaining components. Finally, the implemented sensitivity analysis revealed that the improvement in the efficiency of the main compressor should be seriously considered on the part of the manufacturers.

refrigeration, R744, CO2, exergy, Supermarket
• Haydar Aras
• Claudio ZIlio
• Giampaolo Manfrida
Konular Mühendislik Regular Original Research Article Orcid: 0000-0001-9256-875XYazar: Paride GulloKurum: NTNU Norwegian University of Science and TechnologyÜlke: Norway Yazar: Armin HafnerKurum: NTNU Norwegian University of Science and TechnologyÜlke: Norway
 Bibtex @araştırma makalesi { ijot325883, journal = {International Journal of Thermodynamics}, issn = {1301-9724}, eissn = {2146-1511}, address = {Yaşar DEMİREL}, year = {2017}, volume = {20}, pages = {220 - 227}, doi = {10.5541/eoguijt.325883}, title = {Thermodynamic Performance Assessment of a CO2 Supermarket Refrigeration System with Auxiliary Compression Economization by using Advanced Exergy Analysis}, key = {cite}, author = {Gullo, Paride and Hafner, Armin} } APA Gullo, P , Hafner, A . (2017). Thermodynamic Performance Assessment of a CO2 Supermarket Refrigeration System with Auxiliary Compression Economization by using Advanced Exergy Analysis. International Journal of Thermodynamics, 20 (4), 220-227. DOI: 10.5541/eoguijt.325883 MLA Gullo, P , Hafner, A . "Thermodynamic Performance Assessment of a CO2 Supermarket Refrigeration System with Auxiliary Compression Economization by using Advanced Exergy Analysis". International Journal of Thermodynamics 20 (2017): 220-227 Chicago Gullo, P , Hafner, A . "Thermodynamic Performance Assessment of a CO2 Supermarket Refrigeration System with Auxiliary Compression Economization by using Advanced Exergy Analysis". International Journal of Thermodynamics 20 (2017): 220-227 RIS TY - JOUR T1 - Thermodynamic Performance Assessment of a CO2 Supermarket Refrigeration System with Auxiliary Compression Economization by using Advanced Exergy Analysis AU - Paride Gullo , Armin Hafner Y1 - 2017 PY - 2017 N1 - doi: 10.5541/eoguijt.325883 DO - 10.5541/eoguijt.325883 T2 - International Journal of Thermodynamics JF - Journal JO - JOR SP - 220 EP - 227 VL - 20 IS - 4 SN - 1301-9724-2146-1511 M3 - doi: 10.5541/eoguijt.325883 UR - http://dx.doi.org/10.5541/eoguijt.325883 Y2 - 2017 ER - EndNote %0 International Journal of Thermodynamics Thermodynamic Performance Assessment of a CO2 Supermarket Refrigeration System with Auxiliary Compression Economization by using Advanced Exergy Analysis %A Paride Gullo , Armin Hafner %T Thermodynamic Performance Assessment of a CO2 Supermarket Refrigeration System with Auxiliary Compression Economization by using Advanced Exergy Analysis %D 2017 %J International Journal of Thermodynamics %P 1301-9724-2146-1511 %V 20 %N 4 %R doi: 10.5541/eoguijt.325883 %U 10.5541/eoguijt.325883 ISNAD Gullo, Paride , Hafner, Armin . "Thermodynamic Performance Assessment of a CO2 Supermarket Refrigeration System with Auxiliary Compression Economization by using Advanced Exergy Analysis". International Journal of Thermodynamics 20 / 4 (Kasım 2017): 220-227. http://dx.doi.org/10.5541/eoguijt.325883