PURPOSE: To provide an improved Joule-Thomson freezing cycle in which steady wetting of a polymer member is ensured with condensable components in a working fluid.

CONSTITUTION: A freezing cycle 100 basically includes an electrochemical compressor 12 driven by a reverse polarity power supply 14, a pair of regenerable solvent floors 16, 18 disposed upstream and downstream of the compressor 12, a regenerative heat exchanger 20 disposed between the solvents floors 16, 18 and a heat sink 24, and a pair of Joule-Thomson expansion apparatuses 26, 28 disposed upstream and downstream of the heat sink. The preferable electrochemical compressor 12 includes a first porous electrode 30 including a platina catalyst and a second porous electrode 32 likewise including a platinum catalyst. These electrodes 30, 32 are connected with the reverse polarity power supply 14 through power supply lead wires 34, 36. Further, a solid polymer electrolyte membrane 38 is provided between these electrodes.