冷却方式对发动机冷却系统温差发电器的影响

Effects of Cooling Method on Thermoelectric Generator of Engine Cooling System

温差发电系统最重要的前提是有足够大的温差,为此通过建立基于温差发电的发动机冷却系统能量模拟回收系统,研究了冷却方式对温差发电器两端温差的影响。研究结果表明:在大循环开启之前,温差发电器两端温度基本一致,当开启大循环后,两端温度迅速升高,由于集热器材料存在热阻使得冷却水和热端之间存在温差,温差发电器本身能够导热使得两端的温差较低;采用强制风冷可以显著提高温差发电器两端温差,相比于侧面冷却,正面冷却方式更具有优势,但是只能冷却一面;采用热管连接冷端和散热片的方式能够进一步降低冷端温度,提高温差发电器两端温差。可见,冷却方式对于能量回收系统的温差有着较大的影响。

The most important premise of thermoelectric generator (TEG) system is a large enough temperature difference.The effects of cooling method on the temperature difference at the two end of TEG were thus studied through building an energy recovery simulation system for engine cooling system based on the thermoelectric generation technology.The results show that the temperatures of hot and cold end are the same and increase before and after starting the full circulation.There is a temperature difference between the coolant and hot end due to the thermal resistance of heat collector,but the difference is very small due to the conduction of TEG.It also shows that the forced air cooling method can increase the TEG temperature difference.Compared with the side cooling,the front cooling is more beneficial,but it can only cool one single surface.The method of connecting the cold end and radiator with heat pipe is applied so that the temperature at the cold end further decreases and then the temperature difference becomes large.It is concluded that the cooling method has great influence on the temperature difference of energy recovery system.