Low critical point of CO2 results in transcritical refrigeration cycles with low efficiency and
high discharge pressure. H2O has a high triple point temperature that limits its application
to temperatures above 0
C. In this paper the two stage hybrid cycle is presented, where the
Low Temperature (LT) stage is the compression cycle with CO2 and the High Temperature
(HT) stage is the H2O sorption cycle. The choice between absorption and adsorption
technology depends on the application and most of all is related to the temperature
available for the desorber. This paper presents the adsorption technology on the HT stage
powered by solar thermal energy. The combined hybrid cycle has been tested for two
years at the Politechnika Krakowska, and a summary of the results is shown in this paper.
The experimental results have been compared with two-refrigerants, two stage cycles and
CO2 - only cycles.
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