Modelling of CO₂/acetone fluid mixture thermodynamic properties for compression/resorption refrigeration systems

Compression/resorption refrigeration systems are similar to conventional vapor compression systems but using zeotropic mixtures with large boiling temperature difference, similar to the refrigerant/absorbent mixtures used in absorption technology. A resorber and a desorber replace the conventional condenser and evaporator, respectively. As the saturation temperature in both desorber and resorber change with the composition, there is a gliding temperature that can reduce the irreversibility of the heat transfer with external sensible heat and sink sources. Another advantage of these systems is that they operate at lower pressures and pressure ratios than the conventional ones. CO₂/acetone mixture was proposed for automotive air-conditioning with compression/resorption systems. In this paper, different methods are evaluated for modelling the thermodynamic properties, using experimental data. The selected thermodynamic model will be used to study the performance of the compression/resorption refrigeration cycle. (paper)