10.1021/acs.jced.9b00514.s001 Erik Mickoleit Erik Mickoleit Andreas Jäger Andreas Jäger Cornelia Breitkopf Cornelia Breitkopf Carrier-Fluid Screening for a Three-Phase Sublimation Refrigeration Cycle with CO<sub>2</sub> Using Reference Equations of State and COSMO-SAC American Chemical Society 2019 Three-Phase Sublimation Refrigeration Cycle refrigeration cycle EU CO 2 carrier-fluid multifluid mixture model COSMO-SAC refrigerant R -23 g E GWP 2019-09-17 14:53:34 Journal contribution https://acs.figshare.com/articles/journal_contribution/Carrier-Fluid_Screening_for_a_Three-Phase_Sublimation_Refrigeration_Cycle_with_CO_sub_2_sub_Using_Reference_Equations_of_State_and_COSMO-SAC/9863723 The recently proposed combination of the multifluid mixture model with <i>g</i><sup>E</sup>-models is used for investigating possible carrier-fluids for CO<sub>2</sub> for a new type of refrigeration cycle. According to the EU regulation No. 517/2014, placing refrigerants with a global warming potential greater than 2500 on the market is prohibited after January 1, 2020. Cooling applications designed to cool products below −50 °C, for which mostly the refrigerant R-23 with a global warming potential (GWP) of 14800 is used, are an exception. R-23 could be replaced by carbon dioxide (CO<sub>2</sub>, GWP = 1) in a refrigeration cycle in which the CO<sub>2</sub> is expanded into the sublimation region. The CO<sub>2</sub> could be blended with a suitable carrier-fluid in order to prevent blockages due to enrichment of dry ice as well as to increase the heat transfer in the sublimator. A screening for a suitable carrier-fluid has been conducted using the most accurate equations of state available in the multifluid mixture model combined with a version of the predictive <i>g</i><sup>E</sup>-model COSMO-SAC that considers different strengths of donor–acceptor surface segment combinations. Some of the carrier-fluids lead to a significantly improved coefficient of performance compared to the process with pure CO<sub>2</sub>.