A partition tapered automobile exhaust air temperature difference generator and its tapering angle determination method

Abstract

The invention provides a partition tapered automobile exhaust temperature difference generator and a method for determining the taper angle thereof. The heat exchanger at the hot end is divided into n areas according to the relative temperature difference power generation module up and down, along the inlet end cover to the outlet end cover. direction, the tail ends of the upper and lower sides of each region are inclined inward, forming n taper angles with the flow direction of the exhaust gas, and the taper angles increase sequentially along the taper direction; in the method of determining the taper angle, firstly, the first Area D 1 Taper angle α 1 Divide into multiple α 1j , calculate α 1j The output power of the lower thermoelectric power generation module and the pumping loss caused by each taper angle determine the taper angle α 1 ; According to the principle of equal heat transfer in each area, determine the taper angles of other areas in turn. The taper angle of the present invention increases sequentially along the direction from the inlet end cover to the outlet end cover, so that the heat transfer in each area is equal, and each thermoelectric power generation module works at the same temperature, thereby greatly improving the output power and thermoelectricity of the thermoelectric generator. Conversion efficiency.

Description

technical field [0001] The invention belongs to the field of thermoelectric power generation, and in particular relates to a partition tapered automobile exhaust air temperature difference generator and a method for determining the taper angle thereof. Background technique [0002] At present, in the working process of most internal combustion engines, about 60% to 65% of the energy is taken away by cooling water and automobile exhaust, of which the waste heat of exhaust gas accounts for more than 30%, resulting in huge energy waste. Thermoelectric power generation technology is a new green and environmentally friendly energy technology that uses the Seebeck effect to directly convert heat energy into electrical energy. Due to the advantages of no chemical reaction, no pollution, no moving parts, no noise, and long life, the thermoelectric generator has gained widespread attention. When the traditional flat-plate thermoelectric generator is working, the output power of the ...

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Problems solved by technology

When the traditional flat-plate thermoelectric generator is working, the output power of the thermoelectric generator is affected due to the uneven temperature distribution at the hot end of the heat exchanger. Choose the best thermoelectric material, or adjust the cross-sectional area and height of the thermoelectric semiconductor in each region according to the temperature distribution to reduce the influence of temperature inhomogeneity

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