Non-uniform flow rate composite thermoelectric generator based on temperature dependence of thermoelectric materials

Abstract

The non-uniform flow rate compound thermoelectric generator based on the temperature dependence of thermoelectric materials uses semiconductor thermoelectric power generation technology to recover the waste heat energy in automobile exhaust. The method of gradually decreasing, and then changing the heat transfer coefficient between the exhaust gas and the hot end surface of the semiconductor thermoelectric module, and finally realizing the small gradient change of the surface temperature of the semiconductor thermoelectric module in the fluid flow direction through the change of the heat transfer resistance, ensuring that the thermoelectric material is in the most stable state. Work in an optimal working area, thereby improving thermoelectric conversion efficiency and increasing output power. The invention solves the problem of low thermoelectric conversion efficiency in the process of thermoelectric conversion and utilization of high-temperature waste gas waste heat energy.

Description

technical field [0001] The invention belongs to the technical field of waste heat energy recovery, and relates to a non-uniform flow rate composite thermoelectric generator based on the temperature dependence of thermoelectric materials. Background technique [0002] With the rapid development of global science and technology, human society, especially cities, has entered the era of automobiles. In recent years, the sales volume of automobiles in China has grown rapidly. Cars consume less than 30% of the energy during driving, and about 70% of the energy is converted into waste heat and discharged into the air in the form of exhaust, causing serious air pollution. The temperature of the exhaust gas emitted by the car into the air can be as high as 600°C-700°C. If this part of heat is recovered, it will help to solve the problem of energy shortage and utilization. Therefore, how to effectively recover and utilize the energy in the exhaust gas has become the focus of attenti...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the adverse effect on the performance of thermoelectric materials caused by the large temperature gradient along the process generated by the waste heat energy of high-temperature exhaust gas in the process of thermoelectric conversion and utilization, the present invention proposes a new type of high-efficiency thermoelectric generator based on the temperature dependence of thermoelectric materials. By changing the exhaust gas and The heat transfer coefficient between the hot end faces of the semiconductor thermoelectric module, and then realize the small gradient temperature change of the surface temperature of the semiconductor thermoelectric module in the fluid flow direction through the change of the heat transfer resistance, so as to ensure that the thermoelectric material works in the optimal working area, thereby improving the thermoelectricity. Conversion efficiency, increase output power

Images