Abstract
The present study investigates the suitability of CO 2 hydrate for a use as phase change material in two-phase secondary refrigeration. Unlike the generation of the classical two-phase refrigerants, power limited by mechanical parts, hydrate slurry production has the advantage of being performed using a nonmechanical process. Nevertheless, in order to be efficient, the hydrate slurry needs to fulfil two major conditions: a high latent heat of melting of the solid phase and appropriate flowing conditions of the slurry carrying a sufficient amount of solid. Consequently, in the present work, multi-cycle differential scanning calorimetry (DSC) measurements were performed and confirmed a value of CO 2 hydrate dissociation enthalpy of approximately 500 kJ k g w − 1 , one and a half higher than that of ice ( 333 kJ k g w − 1 ) . Moreover, an experimental loop made it possible to study the CO 2 hydrates in suspension in a carrying liquid and to model the available enthalpy of the system related to the solid fraction of the slurry.
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