Communication Dans Un Congrès Année : 2023

Numerical finite-element study and performance evaluation of an isothermal compression in a hydro-CO2 liquid piston

Résumé

Isothermal compression is a thermodynamic grail. The compactness and speed of traditional systems lead to a technical non-feasibility of this transformation due to the excessive heat density to withdraw. This paper presents how an innovative liquid-CO2 piston design enables isothermal compression and expansion in variable operation modes appropriate to different applications and markets: (i) constant heating power (ii) constant hydraulic power and (iii) minimal compression time. In comparison with traditional compression processes this solution provides a simplified set-up, reduced CAPEX investments and confirms a performance increase with a required work decreased by 40% for compression ratios around 20. Starting at 20 bar and 80°C isothermal compressions proposed have an isothermal efficiency between 88.2 and 96.7% for compression ratios between 5 and 20. Compression energy consumption is reduced between 18 and 41%. First analysis defines the pump and CO2-blower control to obtained "constant heat load" or "constant hydraulic flow" isothermal compressions. Then CFD simulations using COMSOL Multiphysics illustrate the ability of efficiently produce heat at constant temperature, a major outcome to contribute to the decarbonisation of the industry.

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Dates et versions

hal-04722585 , version 1 (05-10-2024)

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  • HAL Id : hal-04722585 , version 1

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François Faraldo, Paul Byrne, Philippe Loiseau, Pascal Lalanne. Numerical finite-element study and performance evaluation of an isothermal compression in a hydro-CO2 liquid piston. The 26th IIR International Congress of refrigeration, ICR 2023, 21 – 25 août 2023, Paris, France, Aug 2023, Paris, France. ⟨hal-04722585⟩
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