Molten salt as one of the most promising heat transfer and heat storage media in the concentrating solar power (CSP) system has such advantages as high and wide liquid temperature

good heat transfer performance

low operation pressure and good thermal stability. An experimental study on turbulent convective heat transfer with low-melting point molten salt in a circular tube was conducted by using a self-made parabolic trough solar collecting and heat transfer system with molten salt. The total heat transfer coefficients from water to salt in a concentric tube heat exchanger at different flow rates were obtained. The change of Nusselt number of low-melting point molten salt with Reynolds number was calculated with the least-square method and the experimental correlation were obtained. Comparison was also made between experimental data and well-known convective heat transfer correlations

with the maximum deviations between the present data and curves predicted by Dittus-Boelter

Colburn

Seider-Tate

and Gnielinski equations of +23%

+13% -10% and -20% respectively.