Investigations are made of heat transfer with supercritical water flowing in inclined tubes. A comprehensive set of data is obtained at pressure from 22. 0 to 28. 0 MPa

mass flow rate from 600 to 1400 kg/(m2· s)

he at fluxes from 250 to 410kW/m

and inclinations of 10°and 14°. A new method of calculating two dimensional wall temperature field for non - vertical tubes is presented at the inside wall condition of neither temperature constant nor heat flux constant. Then heat transfer coefficients and Nusselt number are also obtained. Heat transfer coefficient data for normal heat transfer region and heat transfer deterioration region is correlated respectively. Special heat transfer behavior near the pseudocriti-cal region is analysed. Parameter distribution along the circumference induced by natural convection is also studied.