Solid fraction modelling for CO2 and CO2–THF hydrate slurries used as secondary refrigerants |
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Authors: | Sandrine Marinhas Anthony Delahaye Laurence Fournaison |
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Affiliation: | aCemagref – GPAN, BP 44 – 92163 Antony Cedex, France |
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Abstract: | In the present paper, the suitability of hydrate slurries in secondary refrigeration was investigated by the means of a new hydrate solid-fraction model. Considering the high melting enthalpy of CO2-containing hydrates, slurries presenting high hydrate solid fractions can carry sufficient latent heat to be useful for a two-phase secondary-refrigerant application. The model presented in this paper allowed to calculate the solid fraction of CO2 and CO2–THF hydrate from thermodynamic conditions of pressure and temperature. Contrary to a previous work on single CO2 hydrates in a closed system, the present model can take into account hydrate mixture and is well adapted to additional CO2 injections (opened system). By relying on the hydrate-conversion model results, the study of hydrates in suspension in a carrying liquid was also studied in an experimental loop and was based on a formation process by CO2 injection in a cooled aqueous solution. |
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Keywords: | Refrigeration Ice slurry Secondary refrigerant Hydrate Carbon dioxide R-744 THF Modelling Phase SolidMots clé s: Ré frigé ration Coulis de glace Frigoporteur Hydrate Dioxyde de carbone R-744 THF Modé lisation Phase Solide |
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