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

Number: 0602

Author(s) : FARALDO F., BYRNE P., LOISEAU P., LALANNE P.

Summary

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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Pages: 13 p.

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Details

  • Original title: Numerical finite-element study and performance evaluation of an isothermal compression in a hydro-CO2 liquid piston.
  • Record ID : 30031635
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0602

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