Research On The Output Power Mechanism And Device Development Of Thermoelectric Generator

Energy is the basis for human survival.Energy shortage is becoming an urgent problems for all countries in the world.In recent years,with the rapid development of Chinese economy,the energy security situation has become increasing severe,and the policies and measures of various environmental protection and energy conservation have become our development trend of civilized life.Thermoelectric power technology is a new type of green power generation technology.In this paper,the mechanism research and device development of thermoelectric generator are carried out.The research content has a certain positive impact on improving the temperature difference power generation performance and practical application of semiconductors.The main research contents are as follows:1.The influence of packaging technique for thermoelectric generator on output power was studied,which includes installation pressure,heat dissipation technology,interface filler and series-parallel connection of thermolelectric modules.Based on the above research,the performance testing device of the semiconductor thermoelectric power generation system would be designed and built to study the effect of each parameter on the output power of the thermoelectric module.The experimental results show that there is an optimum parameter combination to make the output power reach the maximum value.2.In order to explore the power generation performance of the semicinductor thermoelectric module,a theoretical mathematical model for analyzing the temperature distribution in the single thermoelectric module and the power generation performance is established.The model explores the various energy conversions and losses between the various links.The research results show that the effective temperature difference actually used for power generation in the thermoelectric module is much smaller than the temperature difference measured in the experiment,which is nearly less than 20%.The thermal resisitance on the thermoelectric module is caused by the thermal resistance between the thermal grease,the ceramic plate,and the thermal resistance caused by contact thermocoouple legs and copper plate.When the thermoelectric generator is in operation,the Joule heat generated in the thermoelectric module is only 3.5% of the total heat.Therefore,the nonlinear temperature distribution inside the thermoelectric module caused by Joule heat is ignored here.The Peltier heat accounts for 6.1% of the total heat,so the Peltier heat cannot be ignored when caculating the linear temperature distribution.In addition,the experimental test results are compared with the results predicted by the mathenatical model,and the reliability of the model are verified.3.On the basis of the above research,a prototype of a fireplace-type thermoelectric generator was developed.The fireplace-typethermoelectric generator was modeled by Solidworks software,and after being commissioned to process and assemble,the prototype was tested on performance.The test results show that when the temperature difference between the hot and cold ends of the thermoelectric module is 100.8 °C,and the output voltage is 12 V,the external electric energy is 14.9 W.At this time,the output voltage of the fireplace-type thermoelectric generator is 25.4 V,and the total output power is 21.3 W;Meanwhile,the fireplace-type thermoelectric generator is able to provide 2013.5W of heat.