The Effects Of The Seebeck Effect - amazonia.fiocruz.br

The Effects Of The Seebeck Effect - opinion

Energy harvesting also known as power harvesting or energy scavenging or ambient power is the process by which energy is derived from external sources e. Energy harvesters provide a very small amount of power for low-energy electronics. While the input fuel to some large-scale generation costs resources oil, coal, etc. For example, temperature gradients exist from the operation of a combustion engine and in urban areas, there is a large amount of electromagnetic energy in the environment because of radio and television broadcasting. One of the earliest applications of ambient power collected from ambient electromagnetic radiation EMR is the crystal radio. The principles of energy harvesting from ambient EMR can be demonstrated with basic components. Energy harvesting devices converting ambient energy into electrical energy have attracted much interest in both the military and commercial sectors. Some systems convert motion, such as that of ocean waves, into electricity to be used by oceanographic monitoring sensors for autonomous operation. The Effects Of The Seebeck Effect

The Effects Of The Seebeck Effect Video

Thermocouple Working Principle: Seebeck Effect, Peltier Effect, Thomson Effect [Active Transducer]

Kind code of ref The Effects Of The Seebeck Effect : A1. Extension state : BA ME. Effective date : The module 40 has thermo-electric elements 3 generating electric current under action of variation in temperature exerted between cylindrical contact faces of the elements. An insulating external envelope defines an external wall of the hot fluid circulation channel. The present invention relates to a module and a thermoelectric device, in particular for generating go here electric current in a motor vehicle. In the automotive field, it has already been proposed thermoelectric devices using so-called electric thermo elements, for generating an electric current in the presence of a temperature gradient between two of their opposite faces according to the phenomenon known as Seebeck effect. These devices comprise a stack of first tubes, https://amazonia.fiocruz.br/scdp/essay/pathetic-fallacy-examples/the-ku-klux-klan-and-the-civil.php for the circulation of the exhaust gases of an engine, and second tubes, intended for the circulation of a heat transfer fluid of a cooling circuit.

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The electrical thermo elements are sandwiched between the tubes so as to go here subjected to a temperature gradient from the temperature difference between the hot exhaust gases and Tje cold cooling fluid. Such devices are particularly interesting because they make it possible to produce electricity from a conversion of the heat coming from the exhaust gases of the engine.

They thus offer the possibility of reducing the fuel consumption of the vehicle by replacing, at least partially, the alternator usually provided therein to generate electricity from a belt driven by the engine crankshaft. The known thermoelectric elements are of rectangular parallelepipedal shape and the temperature gradient for generating the expected electric current is imposed between two of their opposite faces. It is therefore faces of the same size.

However, the convective heat exchange coefficients between a fluid and the wall of a tube in the case of a liquid and a The Effects Of The Seebeck Effect respectively are very different. The thermal efficiency of the whole is thus limited by the fluid, here the exhaust gas, having the lowest heat exchange coefficient. A first solution to solve this Evfects is to use metal turbulators whose function is to increase the conductive surface of the heat in contact with the exhaust gases and the exchange coefficient with said gases. But such a solution has limitations because the turbulators used are complex shaped parts, requiring the use of cutting tools and expensive stamping.

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It is thus possible to adapt the exchange coefficient and improve the performance of the devices equipped while limiting their cost. It is thus provided, in particular, in the form of a helix. Such a shape is particularly advantageous in terms of simplicity of realization and the effects of acceleration of the fluid that it allows, in particular by means of the pitch adaptation of said propeller. According to another aspect of the invention, the disrupter https://amazonia.fiocruz.br/scdp/essay/media-request-css/perception-of-health-lifestyle-information.php provided in the hot fluid circulation channel.

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It will then play its role of adaptation of the exchange coefficient so much more effective, especially in case of hot gaseous fluid. According to another aspect of the invention, one, said first, of said The Effects Of The Seebeck Effect of the electric thermoelectric elements is of surface superior to the other, said second, and said module is configured to establish a heat exchange between said first face and the fluid and to establish a heat exchange between said second face and the cold fluid, said cold fluid having a heat exchange coefficient greater than that of said hot fluid.

By using a larger exchange surface at the fluid having the lowest heat exchange coefficient, it is possible to have a ratio between the thermal resistance on the hot fluid side and the thermal resistance on the cold side more balanced, in particularly when using a hot gaseous fluid and a cold liquid fluid.

In this way, the results already provided by the disturbance are improved. According to various embodiments of this aspect of the invention, which may be taken together or separately:. The invention also relates to a thermoelectric device comprising a plurality of modules as described above.

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According to different aspects of the invention taken together or separately:. The invention will be better understood in the light of the following description which is given only as an indication and which is not intended to limit it, accompanied by the appended drawings among which:. As illustrated in Figures 1 to 3 the invention relates to a thermoelectric module, comprising a first circuit 1, called hot, able to allow the circulation of a first fluid, said hot, in particular of the exhaust gas of an engine, and a second circuit 2, said cold, capable of allowing the circulation of a second fluid, said The Effects Of The Seebeck Effect, including a heat transfer fluid of a cooling circuit, lower temperature than the first fluid.

The module also comprises a plurality of thermoelectric element 3, 3p, 3n, capable of generating an electric current under the action of a temperature gradient exerted between two of their faces 4a, 4b. Such elements operate, according to the Seebeck effect, by making it possible to create an electric current in a load connected between said faces 4a, 4b subjected to the temperature gradient.

In a manner known to the man of In the art, such elements are constituted, for example, by Bismuth and Tellurium Bi 2 Te 3. The thermoelectric elements are, for a first part, elements 3p of a first type, called P, making it possible to establish a difference The Effects Of The Seebeck Effect electric potential in a direction, called positive, when they are subjected to a given temperature gradientand, for the other part, elements 3n of a second type, said N, allowing the creation of a difference of electric potential in an opposite direction, said negative, when they are subjected to the same temperature gradient.

Here, the The Effects Of The Seebeck Effect 4a, said first, of said faces is of upper surface to the other 4b, Thr second, and said module is configured to establish a heat exchange between said first face and the first fluid and to establish a heat exchange between said second face and the second fluid, said second fluid having a higher heat exchange coefficient than said continue reading fluid.

This promotes the exchange between the electric thermo elements 3p, 3n, and the fluid having the lowest heat exchange coefficient, here, the exhaust gas. An example of a thermoelectric element equipping the module according to the invention is described below.]