共查询到18条相似文献,搜索用时 93 毫秒
1.
2.
3.
4.
5.
6.
Bi-Te基热电材料的能带结构计算 总被引:1,自引:0,他引:1
采用基于密度泛函理论的自洽赝势方法,计算了Bi—Te基热电材料不同化学配比下的电子结构。介绍了Bi2Te3材料的能带以及态密度,并计算了不同配比材料的载流子有效质量。计算结果显示:随着碲含量的增加,Bi—Te基热电材料从N型半导体向P型转变,在导电性质确定的情况下,塞贝克系数随着碲含量的增加而升高。 相似文献
7.
8.
9.
温差发电技术及其在汽车发动机排气余热利用中的应用 总被引:7,自引:0,他引:7
介绍了采用半导体热电元件的温差发电技术的特征,包括对半导体材料的要求,适合作汽车排气余热发电的温差发电器的结构等,给出了美、日等国车用温差发电器的实例,还对相关技术的发展趋势作了分析。 相似文献
10.
11.
低温差下半导体温差发电器(火用)分析 总被引:1,自引:0,他引:1
半导体温差发电器的性能通常用输出功率和工作效率来进行评价,但在低温差对低品位能的利用上,只用工作效率来评价是不全面的。从[火用]的角度对低温差下半导体温差发电器的工作性能进行了分析,提出了[火用]效率,用炯效率来作为低温差下半导体温差发电器的评价参数。实验结果表明,随着温差的减小,半导体温差发电器的工作效率明显下降,但[火用]效率则基本稳定。 相似文献
12.
为了评估热电材料ZT值温度依存性对热电发电器性能的影响,基于HZ-20商用热电材料的热物性参数,分别采用定物性与变物性的计算方法,对温差发电器在具有不同热源温度下的工作性能进行理论研究。研究结果表明,当采用定物性方法计算时(即不考虑ZT值温度依存性),输出功率及相应转换效率的计算值都较采用变物性计算时存在一定的偏差。当半导体热端温度低于定物性计算时采用的定性温度值时,偏差很小,但随着半导体热端温度的继续增加,偏差则越来越大,高热端温度下计算得到的计算偏差达30%左右。因此,热电材料ZT值温度依存性对温差发电器热电性能的影响不容忽视。 相似文献
13.
The paper studied the performances of parallel thermoelectric generator (TEG) by theoretical analysis and experimental test. An analytical model of parallel TEG was developed by theoretical analysis and calculation, based on thermodynamics theory, semiconductor thermoelectric theory and law of conservation of energy. Approximate expressions of output power and current of parallel TEG were deduced by the analytical model. An experimental system was built to verify the model. The results indicate that only when all of the thermoelectric modules (TE modules) in the parallel TEG have the same inherent parameters and working conditions, the parallel properties of the TEG are the same as that of common DC power. The existence of contact resistance is just like the increase of the TE module’s internal resistance, which leads to the deceases of output power. The thermal contact resistance reduces the output power by reducing the temperature difference between the two sides of the thermocouples. The results derived from the model are basically consistent with the experimental results, the model is suitable for the performance researching and designing of parallel TEG. 相似文献
14.
B. M. Abdurakhmanov M. M. Adilov M. Kh. Ashurov Kh. B. Ashurov S. E. Maksimov B. L. Oksengendler 《Applied Solar Energy》2012,48(2):79-83
The work presents a model of equivalent medium that allows one to estimate the thermoelectric characteristics of nonuniform semiconductor materials. The model describes experimental results obtained on microgranular silicon and defines ways of achieving high values of thermoelectric Q factor in transformers of thermal energy based on granulated semiconductors in a temperature range that can be easily achieved using solar concentrators. 相似文献
15.
以内燃机为动力的汽车尾气余热具有高度瞬变特性,而温差发电器(termoelectric generator,TEG)往往对温度的变化较为敏感,针对这一矛盾,在尾气管道和热电模块之间添加相变材料层以减缓尾气温度波动对热电模块性能的影响。通过模拟计算的方法,比较了变工况条件下,相变材料层的添加对热电模块热端平均温度、输出电压等因素的影响。结果表明,相变材料(phase change materia,PCM)的添加对热电模块热端温度波动起到了良好的缓冲作用,大大提高了TEG输出电压的稳定性。 相似文献
16.
Thermoelectric modules should be selected or designed to meet the specific cooling/heating requirements of a particular application and in most cases, the cooling/heating capacity and the working temperatures (hot and cold side temperature of thermoelectric devices) are known. Computer modelling can be used to assist the selection process by determining the relationships between the cooling/heating requirements and optimum thermoelectric parameters thermoelectric modules suited to large capacity thermoelectric heat pump applications. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
17.
《Journal of power sources》1998,73(2):193-198
A procedure is developed to assess the potential of thermoelectric modules when used for electrical power generation. The generating performance of a thermoelectric module is evaluated in terms of its power output, conversion efficiency and reliability, while the potential for improving its performance is investigated based upon the power-per-area, cost-per-watt and manufacture quality factor. The methods employed in determining these parameters are described and used to evaluate several commercially available modules. The results show that a thermoelectric module is a promising device for low temperature waste heat recovery. 相似文献