基于热电效应的高效环控系统

Space science experiments are an important work of the space station and scientific satellites, in some space science experiments, the temperature of environment exceeds heat sink temperature range, effective heating and cooling measures are required. Thermoelectric effect has high reliability and low complexity, which is applicable for temperature control in low gravity conditions. In this paper, the effect of thermoelectric cooling and heating at different fluid temperatures is analyzed, and the results show that the smaller difference between fluid temperature and aim temperature, the better effect of thermoelectric cooling and heating effect. The quantity of thermoelectric module decreases first and then increases with increasing current in the environment temperature cooling condition, and it is monotone decreasing in the heating condition. Since the cooling condition requires more thermoelectric modules than the heating condition, the quantity of thermoelectric module is determined according to the cooling conditions. Through the analysis of the environment temperature control system under different flow rates, it can be seen that the larger the flow rate, the higher efficiency of the heat exchanger, and the higher thermal load of the thermoelectric module. As the thermoelectric thermal load has greater impact than the efficiency heat exchanger on the whole system, the total efficiency is decreasing with increasing liquid flow rate. When the fluid temperature is close to the aim temperature, the total efficiency of the thermoelectric environment temperature control system is more than the efficiency of the thermoelectric module in an interval with specific temperature and flow rate. In this paper, performance analysis methods are provided for thermoelectric cooling and heating condition, which has important reference significance for the design of space station experiment temperature control system.