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Supercritical CO2
Demonstration test rig: CO2 visual cell

Demonstration test rig: CO2 visual cell

To visualize the transition of CO2 from the two-phase region to the supercritical state, a demonstration test rig was designed and built at the IKE.

The test stand essentially consists of a visual cell, temperature and pressure sensors, on-site display devices, a measurement data acquisition system, a cryostat for temperature control of the visual cell, a camera for optical recording with different lenses (endocentric and telecentric lens) and light sources, as well as a computer.

Scheme of the demonstration test rig: CO2 visual cell,Institut für Kernenergetik und Energiesysteme, Universität Stuttgart

Scheme of the demonstration test rig: CO2 visual cell, 2020 © IKE

During the experiments, the visual cell is heated or cooled along the isochor line which runs through the critical point at a temperature of 30.98 °C and a pressure of 7.38 MPa.

T-s Diagram of CO2,Institut für Kernenergetik und Energiesysteme, Universität Stuttgart

T-s Diagram of CO2, 2020 © IKE

The first video shows the recording of a quasi-static experiment, using a telecentric lens, in which the viewing cell was cooled down from 36 °C to 28 °C in during 12 h.