Non-uniform flow velocity composite thermoelectric generator based on thermoelectric material temperature dependence

Abstract

The invention discloses a non-uniform flow velocity composite thermoelectric generator based on thermoelectric material temperature dependence. The semiconductor thermoelectric power generation technology is used for recycling waste heat energy in automobile exhaust, high-temperature exhaust passes through a composite variable-section exhaust channel, and the area of the cross section of the high-temperature exhaust in the travel direction is gradually reduced; therefore, the heat transfer coefficient between the tail gas and the hot end face of the semiconductor thermoelectric module is changed, small-gradient change of the surface temperature of the semiconductor thermoelectric module in the fluid flowing direction is finally achieved through change of heat transfer resistance, it is guaranteed that thermoelectric materials work in the optimal working area, the thermoelectric conversion efficiency is improved, and the output power is increased. The problem that the thermoelectric conversion efficiency of high-temperature waste gas waste heat energy is low in the thermoelectric conversion utilization process is solved.

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...

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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

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