Experimental assessment of CO2/R-152a mixtures in a refrigeration plant with integrated mechanical subcooling
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INVESTIGACIONMetadades
Títol
Experimental assessment of CO2/R-152a mixtures in a refrigeration plant with integrated mechanical subcoolingData de publicació
2024-02-01Editor
Science DirectISSN
0140-7007Cita bibliogràfica
M. Martínez-Ángeles, L. Nebot-Andrés, D. Calleja-Anta, R. Llopis, Experimental assessment of CO2/R-152a mixtures in a refrigeration plant with integrated mechanical subcooling, International Journal of Refrigeration, Volume 158, 2024, Pages 288-302, ISSN 0140-7007, https://doi.org/10.1016/j.ijrefrig.2023.12.005.Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
https://www.sciencedirect.com/science/article/pii/S0140700723004619Versió
info:eu-repo/semantics/acceptedVersionParaules clau / Matèries
Resum
During the last years, CO2 utilization has grown in the refrigeration sector, especially in medium and large size plants. These cycles have implemented complex architectures to improve their energetic performance and ... [+]
During the last years, CO2 utilization has grown in the refrigeration sector, especially in medium and large size plants. These cycles have implemented complex architectures to improve their energetic performance and be cost-effective. One of the most advanced architectures is cycle with the integrated mechanical subcooling. This work aims to experimentally evaluate the performance of this cycle using CO2/R-152a mixtures. Two R-152a mass concentrations, 5 % and 10 %, are selected for testing on a test rig at heat rejection temperatures from 20 °C to 40 °C with 5 °C step and at one temperature (2.50 °C of secondary fluid) at the inlet of the evaporator. The results show that the use of CO2/R-152a mixtures improves COP values of the cycle, confirming the trend observed in previous studies. However, it is observed that the cooling capacity decreases compared to pure CO2 due to the reduction in volumetric cooling capacity. The introduction of R-152a increases both critical temperature and pressure, and reduce the optimum heat rejection pressure, enabling more efficient operation in subcritical conditions. The study determines an upper limit for the R-152a mass fraction (10 %) beyond which the behaviour of the IMS cycle gets worse significantly compared to pure CO2. [-]
Publicat a
International Journal of Refrigeration, Volume 158, 2024.Entitat finançadora
Agencia Estatal de Investigación | Universitat Jaume I | European Union NextGenerationEU
Codi del projecte o subvenció
TED2021-130162B-I00 | UJI-B2021-10
Drets d'accés
info:eu-repo/semantics/embargoedAccess
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