STUDY ON THERMAL AND HYDRAULIC PERFORMANCE OF THIRD GENERATION SOLAR THERMAL POWER HEAT EXCHANGER
This article uses numerical simulation methods to investigate the thermal hydraulic laws of the flow channels in a molten salt and sCO2 printed circuit board heat exchanger(PCHE)using binary eutectic salts MgCl2-KCl and sCO2 as heat transfer media.In the airfoil channel,due to the collision of the flowing working fluid at the end of the fins,the minimum flow velocity generally occurs at the end of the fins.Due to the influence of flow velocity,the minimum pressure usually occurs at the thickest part of the fins.Nu and Δp in both straight and wing channels increase with the increase of Re,while f decreases with the increase of Re.The heat transfer efficiency in the straight channel and wing channel has been improved by 53.3% and 56.9%,respectively.By fitting,a heat transfer and friction correlation equation was established for molten salt and sCO2 as working fluids in printed circuit board heat exchangers.
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