This paper establishes a trapezoidal cross-sectional PCHE model and uses numerical simulation methods to study the PCHE heat exchanger with molten salt and SCO2 as working fluids, further exploring the flow and heat transfer characteristics of both.The results indicate that with the increase in mass flow rate, temperature, and pressure, the convective heat transfer coefficient of SCO2 increases, while the heat transfer coefficient of molten salt gradually decreases. The trapezoidal cross-sectional channel enhances the heat transfer performance due to the secondary flow effect, especially under a 35-degree bending angle, where the effect is more pronounced.Compared to traditional semicircular channels, the temperature rise in trapezoidal cross-section channels increases by 5.5%, and the pressure drop decreased by 8.6%.
Key words
solar thermal power generation /
numerical simulation /
PCHE heat exchanger /
molten salt energy storage /
supercritical CO2 /
heat transfer enhancement
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