New approach to improve COP and heat recovery in transcritical CO2 refrigeration system for milk processing application
Abstract In hot climates, subcooling or after-cooling is an effective method to enhance the coefficient of performance (COP) of CO2 transcritical refrigeration system. This study investigates improvement of two contemporary subcooling arrangements: Integrated mechanical subcooling (IMS) and dedicate...
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Nature Portfolio
2025-02-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-025-90067-3 |
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| author | Prosenjit Singha Chayan Das Mani Sankar Dasgupta Souvik Bhattacharyya Armin Hafner |
| author_facet | Prosenjit Singha Chayan Das Mani Sankar Dasgupta Souvik Bhattacharyya Armin Hafner |
| author_sort | Prosenjit Singha |
| collection | DOAJ |
| description | Abstract In hot climates, subcooling or after-cooling is an effective method to enhance the coefficient of performance (COP) of CO2 transcritical refrigeration system. This study investigates improvement of two contemporary subcooling arrangements: Integrated mechanical subcooling (IMS) and dedicated mechanical subcooling (DMS) and evaporative cooling arrangement to gascooler by introduction of gravity-fed evaporator in a dual evaporator parallel compression system suitable for milk processing. Using location-specific average meteorological data, the performance of the proposed systems is evaluated for Pune, India. Comparative analysis is conducted against a baseline transcritical CO2 system with flash gas bypass but lacking any subcooling arrangement. A considerable improvement in COP is observed when subcooling is combined with parallel compression. Incorporation of evaporative cooling with parallel compression yields 62.3% improvement in COP over the flash gas bypass system. However, heat recovery potential is considerably reduced by adopting evaporative cooling. Additionally, the study quantifies a potential reduction in water consumption of 45.6% over a system using flash gas bypass with an indirect evaporative cooling arrangement, and a reduction of 34.3% over a system employing parallel compression with a split gas cooler indirect evaporative cooling arrangement. |
| format | Article |
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| institution | DOAJ |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Nature Portfolio |
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| series | Scientific Reports |
| spelling | doaj-art-181d028f87834ea0bf763746f70c8fed2025-08-20T02:48:29ZengNature PortfolioScientific Reports2045-23222025-02-0115111410.1038/s41598-025-90067-3New approach to improve COP and heat recovery in transcritical CO2 refrigeration system for milk processing applicationProsenjit Singha0Chayan Das1Mani Sankar Dasgupta2Souvik Bhattacharyya3Armin Hafner4Department of Mechanical Engineering, BITS PilaniDepartment of Mechanical Engineering, BITS PilaniDepartment of Mechanical Engineering, BITS PilaniTCG CRESTNorwegian University of Science and TechnologyAbstract In hot climates, subcooling or after-cooling is an effective method to enhance the coefficient of performance (COP) of CO2 transcritical refrigeration system. This study investigates improvement of two contemporary subcooling arrangements: Integrated mechanical subcooling (IMS) and dedicated mechanical subcooling (DMS) and evaporative cooling arrangement to gascooler by introduction of gravity-fed evaporator in a dual evaporator parallel compression system suitable for milk processing. Using location-specific average meteorological data, the performance of the proposed systems is evaluated for Pune, India. Comparative analysis is conducted against a baseline transcritical CO2 system with flash gas bypass but lacking any subcooling arrangement. A considerable improvement in COP is observed when subcooling is combined with parallel compression. Incorporation of evaporative cooling with parallel compression yields 62.3% improvement in COP over the flash gas bypass system. However, heat recovery potential is considerably reduced by adopting evaporative cooling. Additionally, the study quantifies a potential reduction in water consumption of 45.6% over a system using flash gas bypass with an indirect evaporative cooling arrangement, and a reduction of 34.3% over a system employing parallel compression with a split gas cooler indirect evaporative cooling arrangement.https://doi.org/10.1038/s41598-025-90067-3CO2 transcriticalSubcoolingParallel compressionEnergy efficiencyEvaporative cooling |
| spellingShingle | Prosenjit Singha Chayan Das Mani Sankar Dasgupta Souvik Bhattacharyya Armin Hafner New approach to improve COP and heat recovery in transcritical CO2 refrigeration system for milk processing application Scientific Reports CO2 transcritical Subcooling Parallel compression Energy efficiency Evaporative cooling |
| title | New approach to improve COP and heat recovery in transcritical CO2 refrigeration system for milk processing application |
| title_full | New approach to improve COP and heat recovery in transcritical CO2 refrigeration system for milk processing application |
| title_fullStr | New approach to improve COP and heat recovery in transcritical CO2 refrigeration system for milk processing application |
| title_full_unstemmed | New approach to improve COP and heat recovery in transcritical CO2 refrigeration system for milk processing application |
| title_short | New approach to improve COP and heat recovery in transcritical CO2 refrigeration system for milk processing application |
| title_sort | new approach to improve cop and heat recovery in transcritical co2 refrigeration system for milk processing application |
| topic | CO2 transcritical Subcooling Parallel compression Energy efficiency Evaporative cooling |
| url | https://doi.org/10.1038/s41598-025-90067-3 |
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