Due to increasingly strict environmental constraints, a new class of secondary refrigerants is needed. The use of ice slurries as secondary refrigerants is a very promising technology. In order to design cold distribution plants efficiently, one must know how to predict the thermodynamic properties of the mixtures. Existing models are based on correlations with numerous parameters. The aim of this study is to establish consistent thermodynamic models that require a minimum of parameters in order to determine the composition and the enthalpy of ice slurries. A model based on excess Gibbs energy is proposed. Comparisons between experimental and calculated values confirm the capacity of the model to describe simultaneously the phase behavior and the enthalpy of the ice slurry with the same set of parameters.