Process for producing cold and/or heat by use of an absorption cycle with carbon dioxide as working fluid

A process for producing cold and/or heat, making use of an absorption cycle, characterized by the steps of:

• (a) subjecting a solution (L1) of carbon dioxide in a liquid phase comprising a solvent for carbon dioxide to heating, under at least partial carbon dioxide desorption conditions, so as to form a gaseous phase (G1) of carbon dioxide and a desorbed liquid phase (S1), and separating the phase (G1) from the phase (S1),
• (b) admixing the gaseous phase (G1) with a liquid phase (S2) comprising a solvent for carbon dioxide and removing the heat evolved, so as to dissolve at least a portion of the gaseous phase (G1) into the solvent liquid phase (S2) and to obtain a solution (L2) of carbon dioxide in the solvent liquid phase (S2),
• (c) decreasing the pressure of solution (L2) and subjecting said solution to heating, under conditions of at least partial desorption of carbon dioxide, so as to form a gaseous phase (G2) of carbon dioxide and a desorbed liquid phase (S3), and separating the phase (G2) from the phase (S3),
• (d) decreasing the pressure of the desorbed liquid phase (S1) substantially to the pressure level of phase (G2) and admixing the phase (S1) with the phase (G2) while removing the evolved heat, so as to obtain a solution (L3) of the phase (G2) in the phase (S1),
• (e) increasing the pressure level of solution (L3) substantially to the pressure level of solution (L1) and then feeding back at least a portion of solution (L3), after recompression, to step (a) so as to reconstitute at least a portion of solution (L1), and
• (f) increasing the pressure level of the desorbed liquid phase (S3) substantially to the pressure level of the gaseous phase (G1) and then feeding back at least a portion of the liquid phase (S3), after recompression, to step (b) so as to reconstitute at least a portion of the liquid phase (S2).