Due to the closed structure

it is difficult for valve reactor to dissipate heat from the core efficiently. In order to acquire the heat dissipation characteristics

and to predict the temperature during operation

the heat dissipation process needs to be accurately modeled. Consequently we first analyzed the structure and heat dissipation process

then established and simplified the heat dissipation balance equation of the core

which contains the key equivalent thermal resistance parameters. By studying the equation

we proposed a method for obtaining the equivalent thermal resistance parameters through parameter fitting by using multiple test data under different working conditions. To verify the method

a finite element calculation tool was used to simulate the reactor heat dissipation process. Finally

a reactor temperature rise test platform was designed and built

and multiple sets of test data were adopted to fit the equivalent thermal resistance parameters in the model. The simulation and test data reveal that the fitted results are accurate and the deviation of estimated core temperature is negligible

which shows a certain guiding significance for the structure design of the reactor.