{"id":9897,"date":"2024-06-21T12:18:13","date_gmt":"2024-06-21T12:18:13","guid":{"rendered":"https:\/\/desolination.eu\/?p=9897"},"modified":"2026-05-11T13:45:19","modified_gmt":"2026-05-11T13:45:19","slug":"experimental-isochoric-apparatus-for-bubble-points-determination-application-to-co2-binary-mixtures-as-advanced-working-fluids","status":"publish","type":"post","link":"https:\/\/desolination.eu\/fr\/experimental-isochoric-apparatus-for-bubble-points-determination-application-to-co2-binary-mixtures-as-advanced-working-fluids\/","title":{"rendered":"Experimental Isochoric Apparatus for Bubble Points Determination: Application to CO2 Binary Mixtures as Advanced Working Fluids"},"content":{"rendered":"

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Carbon dioxide binarFIGy mixtures are increasingly considered as working fluids in transcritical power cycles, due to the capability to perform liquid-phase compression even at high environmental temperatures. However, a robust thermodynamic model is essential for optimal and reliable design conditions. It is widely recognized that fine-tuning the equation of state with experimental vapor-liquid equilibrium data of the mixture significantly enhances its reliability.<\/p>\n

In this work, a new apparatus dedicated to vapour-liquid equilibrium measurements of mixtures is presented. The proposed method consists of a constant-volume system, where bubble points are identified from the divergence of slope of the isochoric lines between the two-phase and liquid regions, in the temperature-pressure plane. The temperature and pressure limits of the apparatus are 503 K and 25 MPa. Bubble points of CO2<\/sub> binary mixtures with hexafluorobenzene (C6<\/sub>F6<\/sub>) and n-pentane (C5<\/sub>H12<\/sub>) have been measured and compared with previous literature data for validation purposes. Then, the CO2<\/sub> mixture with octafluorocyclobutane (c-C4<\/sub>F8<\/sub>) is experimentally studied, addressing a literature gap in bubble point data.<\/p>\n

The data are used to calibrate the thermodynamic model, leading to affordable design conditions of the power cycle compared to the non-optimized thermodynamics scenario, in a concentrated solar power tower plant.<\/p>\n

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https:\/\/doi.org\/10.1016\/j.ijft.2024.100742<\/span><\/svg><\/a><\/p>\n

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Authors<\/span>:<\/p>\n