Extensible experimental system for convective heat transfer performance in supercritical carbon dioxide tube

The utility model relates to an expandable system for testing convective heat transfer performance in a supercritical carbon dioxide tube, a cooler serving as a heat exchange device is a heat exchanger with carbon dioxide after a test as a hot fluid and water as a cold fluid, and the carbon dioxide fluid in the tube is heated by the carbon dioxide for the test in a tube wall electric heating mode. The low-voltage and high-current alternating current is applied to the pipe wall as a heat source for heating, the stable and uniform wall surface heat flux density condition can be continuously provided, and the non-uniform wall surface heat flux condition can also be achieved by replacing a special pipeline. The experimental system has a high-expandability experimental section space for arranging an experimental section, can be expanded by additionally arranging an additional frame, and can realize experiments with different pipe diameters, different pipe structures, different test lengths and different flow param