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THERMAL ENGINEERING RESEARCH OF THERMOELECTRIC GENERATION BY USE OF VERY THIN AMORPHOUS SEMICONDUCTOR LAYER.

利用极薄非晶半导体层产生热电的热工程研究。

基本信息

批准号：
60420029
负责人：
MORI YASUO
金额：
$ 7.62万
依托单位：
UNIVERSITY OF ELECTRO-COMMUNICATIONS
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

项目摘要

In the conventional thermoelectric power generation, a thermoelectric device of crystalline structure is used and generates electric power by use of the themperature difference caused between the both ends of the device due to its thermal resistance, but the temperature difference is fairly small. In this research, a new proposal is made as to effectively use a large temperature difference between the both ends in the width direction of a fin of thin metal plate one end of which is welded to a water pipe for cooling. The fin is exposed to hot gas and a semiconductor of a good thermoelectric performance and of amorphous structure is put on by a cluster-ion vapor deposition method. The electrodes are attached at the both ends of the fin and a thin polyimide layer is spreaded between the fin surface and the amorphous thin layer. For the low or medium temperature region Ge-in mixtures were used and experiments on thermoelectric performances and power generation were made by use of a solar … More heat simulating equipment made for this research. In the experiment of solar heat flux, the temperature difference of 20゜C was obtained but a high performance was not obtained due to the poor thermoelectric performance of the mixture and the thin amorphous layer. In the high temperature experiment mainly aiming at effective use of exhaust combustion gas of temperature region of 250゜C to 400゜C, Fe-Si was selected as the material and the construction same as used for medium temperatures was adopted. A hot gas wind funnel of vertical construction was manufactured for experiments. Many samples of Fe-Si amouphous layer deposited on thin flat glass plate were made for getting Zeebeck coefficient, specific resistance and effect of Fe to Si atomic ratio on performance. In thermal engineering experiments, in a hot gas of about 350゜C, about 180゜C temperature difference which is sufficiently large for use of thermoelectric power generation was proved to attain in the fin due to the fin and leading edge effcts. A general investigation of thermoelectric performance considering temperature dependence of Zeebeck performance was made. The relations of the open circuit voltage and the short circuit current and the maximum power output were newly derived for the thermoelectric generator construction proposed in this research. The value of Zeebeck coefficient of about 10 mV/゜C was obtained for Fe-Si at about 300゜C. But as the amouphous layer was so thin the power was found not so large. Finally, the performance change with time and future problems to be studied were discussed. Less

在传统的热电发电中，使用晶体结构的热电器件，利用器件两端因热阻而产生的温差发电，但温差很小。在本研究中，为了有效地利用一端焊接在水管上进行冷却的金属薄板翅片两端在宽度方向上的较大温差，提出了一种新的方案。将翅片暴露在热气体中，通过簇离子气相沉积法镀上热电性能良好且非晶结构的半导体。电极连接在鳍片的两端，在鳍片表面和非晶薄层之间铺有薄聚酰亚胺层。在低、中温区，采用锗银混合材料，利用太阳能热模拟装置进行了热电性能和发电实验。在太阳热通量实验中，由于混合物热电性能差，非晶层薄，获得了20 C的温差，但没有获得很高的性能。在高温实验中，主要针对250 C至400 C温度区域的废气有效利用，选用Fe-Si作为材料，采用与中温相同的结构。制作了一种垂直结构的热气风漏斗进行实验。在薄平板玻璃上制备了大量Fe-Si非晶层样品，测定了Zeebeck系数、比电阻和铁硅原子比对其性能的影响。在热工程实验中，在约350ºC的热气体中，由于翅片和前缘效应，证明在翅片中可获得足以用于热电发电的约180ºC温差。考虑Zeebeck性能的温度依赖性，对热电性能进行了全面的研究。本文针对所提出的热电发电机结构，重新推导了开路电压与短路电流及最大功率输出的关系。Fe-Si在约300℃时的Zeebeck系数约为10 mV/ C。但由于非晶层很薄，人们发现功率并不是那么大。最后，讨论了性能随时间的变化以及未来需要研究的问题。少