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>.