Thermodynamic, environmental, and exergoeconomic analysis of multi-ejector expansion transcritical CO2 supermarket refrigeration cycles in different climate regions of Türkiye

•Ejector cycles achieved higher performance than booster cycle within the gas cooler outlet temperature range of 31 and 50°C.•Multi-ejectors can be applied to ejector cycles with different configurations.•Up to 17% annual energy consumption reduction was found using ejector cycles.•Unit product exer...

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Bibliographic Details
Published in:International journal of refrigeration 2024-09, Vol.165, p.466-484
Main Authors: Caliskan, Oguz, Bilir Sag, Nagihan, Ersoy, H. Kursad
Format: Article
Language:English
Subjects:
Analyse exergoéconomique
Carbon dioxide
Dioxyde de carbone
Ejector
Environmental impact
Exergoeconomic analysis
Froid dans les supermarchés
Impact environnemental
Supermarket refrigeration
Éjecteur
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Summary:•Ejector cycles achieved higher performance than booster cycle within the gas cooler outlet temperature range of 31 and 50°C.•Multi-ejectors can be applied to ejector cycles with different configurations.•Up to 17% annual energy consumption reduction was found using ejector cycles.•Unit product exergy costs of ejector cycles are up to 28% lower than booster cycle. Restrictions on high-GWP refrigerants have made the use of transcritical CO2 refrigeration systems widespread. Using transcritical booster refrigeration cycle in warm climates is unsatisfactory due to its high energy consumption. This paper presents theoretical analysis and performance comparison of three different transcritical CO2 supermarket refrigeration cycle configurations with ejector expansion in Türkiye, which has different climatic regions. Bin-hour data were derived using hourly dry-bulb temperature values for provinces from 7 different regions in Türkiye. The applicability of multi-ejectors to each modeled cycle was also investigated. Annual energy consumption and environmental impact reductions of up to 17% were obtained using ejector expansion cycle compared to booster cycle. Ejector expansion cycles achieved higher performance than booster cycle up to 46% in terms of exergy efficiency at investigated ambient temperatures. Unit product exergy costs of the ejector cycles were found up to 28% lower than booster cycle. [Display omitted]
ISSN:0140-7007
1879-2081
DOI:10.1016/j.ijrefrig.2024.05.006