Design And Optimization Of High Power Heat Rejection System For Space

Entering the twenty-first Century,with the continuous enhancement of space development demand,especially in order to meet the needs of manned deep space exploration,the space utilization of nuclear energy has become the focus of development again,and focuses on the development of high-power nuclear power and high-power nuclear propulsion.The nuclear propulsion system is mainly composed of five parts: the space nuclear reactor thermoelectric conversion system,the thermal discharge system,the power management and distribution system,and the high-power electric propulsion system.The function of the space thermal emission system is to discharge the waste heat generated by the components of the reactor thermoelectric thruster and the spaceship electronic components to the universe.Heat rejection system for space occupies an important position in the spacecraft.It release the waste heat generated by the nuclear reactor into the universe and ensure normal and safe operation of all instruments and equipments of spacecraft.Heat rejection system consists of the heat transport loop,the carbon foam heat exchangers,the heat pipes and radiator panels.The heat from the main heat exchanger of Brayton power converters passes through the heat transport loop,the carbon foam heat exchanger and the heat pipe and is finally radiated into space by the radiator panels.The first step of this paper was to design the above four parts and select the parameters according to the thermal load.The second was to complete the heat transfer calculation of each part by programming software and thermal analysis software,which in order to get cold junction temperature and hot junction temperature.Next,the overall system would be verificated and optimizated and according to the verification results the parameters were repeatedly modified to check the error within the allowable range,then the final design parameters of the system would be obtained.Finally the heat load would be changed in order to get the corresponding relationship between the total mass,the total radiator area,the truss length and the heat load.