This paper establishes a trapezoidal cross-sectional PCHE model and uses numerical simulation methods to study the PCHE heat exchanger with molten salt and SCO 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 SCO 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%.