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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

THERMAL-HYDRAULIC PERFORMANCE OF PRINTED CIRCUIT HEAT EXCHANGER BETWEEN SUPERCRITICAL CO2 AND MOLTEN SALT

Get access (open in a dialog) DOI: 10.1615/IHTC16.her.023386
pages 4805-4813

要約

Molten salt and supercritical fluid are very important heat transfer media for their high density, low viscosity and high specific heat, but the design and investigation of molten salt/supercritical carbon dioxide (S-CO2) heat exchanger was seldom reported. In this paper, a printed circuit heat exchanger (PCHE) with three supercritical CO2 flow passages and two molten salt flow passages in one unit is proposed, and its thermal-hydraulic performance was simulated. The flow field of S-CO2 remarkably changes along the flow direction, while flow field of molten salt changes little, and the pressure drops of molten salt and S-CO2 are respectively 528.28 Pa and 373.5 Pa. At the inlet stage of S-CO2 flow passage, the heat transfer enhancement occurs due to the high specific heat and the buoyant force, which causes the formation of vortices and disturbs the temperature distribution. With the increase of the fluid temperature in middle stage, the influence of the buoyant force decreases for little density difference, and the specific heat also decreases, so heat transfer deteriorates. In the outlet stage of the heat exchanger, turbulent kinetic energy rapidly develops and heat transfer is enhanced.