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Energy analysis of two-phase secondary refrigeration in steady-state operation, part 2: Exergy analysis and effects of phase change kinetics

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  • Pons, Michel
  • Delahaye, Anthony
  • Fournaison, Laurence
  • Dalmazzone, Didier

Abstract

A great deal of attention is paid to secondary refrigeration as a means of reducing excessively high emissions of refrigerants (most of which have a potent greenhouse effect) due to leaks in large cooling units. Among the environmentally friendly fluids that can be used in secondary circuits for transporting and storing cold, hydrate slurries offer the advantage of significant latent heats of fusion associated with good fluidity. Research programs have focused attention on hydrate systems, including CO2, TBPB (tetra-n-butyl-phosphonium-bromide), and mixed CO2-TBPB hydrates. In addition to feasibility concerns, energy efficiency is also a crucial concern requiring an objective analysis of the improvements likely to result from these new materials. A numerical model of secondary refrigeration system was built for slurries ranging from ice-slurry to TBPB-CO2 mixed hydrate slurries. The circuit was designed for maximizing performance under various constraints relating to power rate, heat transfer areas, and flow ability. The effects of phase change kinetics on thermal exchanges were introduced in the model and in the exergy balance. The results, analyzed in terms of exergy losses, demonstrate the couplings through which kinetics influences global performance.

Suggested Citation

  • Pons, Michel & Delahaye, Anthony & Fournaison, Laurence & Dalmazzone, Didier, 2018. "Energy analysis of two-phase secondary refrigeration in steady-state operation, part 2: Exergy analysis and effects of phase change kinetics," Energy, Elsevier, vol. 161(C), pages 1291-1299.
    • Handle: RePEc:eee:energy:v:161:y:2018:i:c:p:1291-1299
    DOI: 10.1016/j.energy.2018.07.044
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    References listed on IDEAS

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    1. Pons, Michel & Hoang, Hong-Minh & Dufour, Thomas & Fournaison, Laurence & Delahaye, Anthony, 2018. "Energy analysis of two-phase secondary refrigeration in steady-state operation, part 1: Global optimization and leading parameter," Energy, Elsevier, vol. 161(C), pages 1282-1290.
    2. Dufour, Thomas & Hoang, Hong Minh & Oignet, Jérémy & Osswald, Véronique & Clain, Pascal & Fournaison, Laurence & Delahaye, Anthony, 2017. "Impact of pressure on the dynamic behavior of CO2 hydrate slurry in a stirred tank reactor applied to cold thermal energy storage," Applied Energy, Elsevier, vol. 204(C), pages 641-652.
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    1. Dufour, Thomas & Hoang, Hong Minh & Oignet, Jérémy & Osswald, Véronique & Fournaison, Laurence & Delahaye, Anthony, 2019. "Experimental and modelling study of energy efficiency of CO2 hydrate slurry in a coil heat exchanger," Applied Energy, Elsevier, vol. 242(C), pages 492-505.
    2. Tiwari, Vipul Kumar & Kumar, Alok & Kumar, Arvind, 2019. "Enhancing ice slurry generation by using inclined cavity for subzero cold thermal energy storage: Simulation, experiment and performance analysis," Energy, Elsevier, vol. 183(C), pages 398-414.

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