基于TEC的空间站末端回路温控系统建模及其热力学性能分析

A thermal control system was designed based on terminal single phase fluid circuit with thermoelectric cooler (TEC), which was capable of solving the problem of overranging temperature of science loads, when the intermediate circuit temperature fluctuated greatly. A thermal control module based on TEC was presented for improving the cooling ability of the fluid circuit, to recover its cooling capacity. Extra cooling power was provided to lower the working fluid temperature of inlet flows through the cold plate, providing a relative lower temperature region around science load, when the fluid circuit power was insufficient because of the high temperature of the intermediate circuit flow. Moreover, a mathematical model and a numerical simulation model were established separately for the proposed thermal control system. Furthermore, the thermal control performance of the TEC module was verified in the cases of four thermal disturbances, such as heat load disturbance of science load, temperature disturbance of the intermediate circuit, mass flow rate disturbance of the terminal circuit, and heat disturbance of parallel branches. Simulation work shows that: the designed thermal control system keeps the temperature fluctuation margin of science load below 1K for strict cooling requirement, in several conditions such as: science load heating power increase by 30%, intermediate circuit temperature increase by 5K, terminal circuit mass flow rate decrease to 0.0015kg/s.