For helical coiled tube steam generator for liquid metal reactor

the working medium at the first side is liquid metal and that at the second side is water

and its thermal and hydraulic characteristics are significantly different from those of conventional pressurized water reactor natural circulation saturated steam generators. The helical coiled tube steam generator of liquid metal reactor is equivalent as flow network system and divided into flow circuits

pressure nodes

and other components. The mathematical model for calculating thermal hydraulic parameters such as pressure drop

flow rate and temperature

and mathematical model for calculating the metal wall temperature of tube bundles are established

based on the mass

momentum and energy conservations.Moreover

the profile of flow rate

pressure drop

working medium temperature

outlet steam temperature

wall temperature

vapor quality and heat transfer coefficient in helical coiled tubes are obtained through the direct solving of nonlinear equations composed of unknown flow rate and pressure nodes in the flow circuit. The flow and heat transfer characteristics of the helical coiled tubes in steam generator are obtained. Besides

one-dimensional system analysis and calculation programs are proposed other than RELAP5 and the thermal hydraulic calculation method of helical coiled tube steam generator has been improved.