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  1. Article: Stretchable thermoelectric generator for wearable power source and temperature detection applications

    Shi, Yaoguang / Lü, Xiaozhou / Xiang, Qingpei / Li, Jing / Shao, Xiaojun / Bao, Weimin

    Energy conversion and management. 2022 Feb. 01, v. 253

    2022  

    Abstract: Wearable thermoelectric generators are attracting tremendous interest due to their capability of converting the human body heat into electricity for powering electronics. In order to reduce the parasitic thermal resistance and enhance the efficiency of ... ...

    Abstract Wearable thermoelectric generators are attracting tremendous interest due to their capability of converting the human body heat into electricity for powering electronics. In order to reduce the parasitic thermal resistance and enhance the efficiency of the energy harvesting process, the compliance of the device is required by introducing stretchable structures or materials. Thus, in this work, we present a novel stretchable thermoelectric generator (STEG) with 50 pairs of bulk thermoelectric legs connected by the kirigami-inspired flexible electrodes. The device was fabricated by a sacrificial layer assisted soldering fabrication method and its generation performances were characterized under natural and forced convection, as well as constant temperature difference conditions, respectively. The results indicated that the generated power density of the STEG under convection was enhanced by improving the cold-side air velocity, and the power density of the device under constant temperature difference conditions could be promoted with order of magnitudes to 2.7 mW/cm² at ΔT = 50 K. Besides, the STEG features reliable during the cycling of 30 % tensile strain load and bending with a radius of 5 mm, respectively. Finally, various practical applications of the STEG were investigated including the wearable power supply and temperature detector for human proximity/contact testing and high-temperature alert. Our results demonstrate that the proposed STEG configuration displays high output performance that could be utilized for wearable electronics applications.
    Keywords administrative management ; air ; body temperature ; compliance ; convection ; electricity ; electronics ; energy conversion ; heat tolerance ; humans ; tensile strength ; thermoelectric generators
    Language English
    Dates of publication 2022-0201
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2000891-0
    ISSN 0196-8904
    ISSN 0196-8904
    DOI 10.1016/j.enconman.2021.115167
    Database NAL-Catalogue (AGRICOLA)

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  2. Article: Flexible Capacitive Pressure Sensor Based on Microstructured Composite Dielectric Layer for Broad Linear Range Pressure Sensing Applications.

    Shi, Yaoguang / Lü, Xiaozhou / Zhao, Jihao / Wang, Wenran / Meng, Xiangyu / Wang, Pengfei / Li, Fan

    Micromachines

    2022  Volume 13, Issue 2

    Abstract: Flexible pressure sensors have attracted a considerable amount of attention in various fields including robotics and healthcare applications, among others. However, it remains significantly challenging to design and fabricate a flexible capacitive ... ...

    Abstract Flexible pressure sensors have attracted a considerable amount of attention in various fields including robotics and healthcare applications, among others. However, it remains significantly challenging to design and fabricate a flexible capacitive pressure sensor with a quite broad linearity detection range due to the nonlinear stress-strain relation of the hyperelastic polymer-based dielectric material. Along these lines, in this work, a novel flexible capacitive pressure sensor with microstructured composite dielectric layer (MCDL) is demonstrated. The MCDL was prepared by enforcing a solvent-free planetary mixing and replica molding method, while the performances of the flexible capacitive pressure sensor were characterized by performing various experimental tests. More specifically, the proposed capacitive pressure sensor with 4.0 wt % cone-type MCDL could perceive external pressure loads with a broad detection range of 0-1.3 MPa, which yielded a high sensitivity value of 3.97 × 10
    Language English
    Publishing date 2022-01-29
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2620864-7
    ISSN 2072-666X
    ISSN 2072-666X
    DOI 10.3390/mi13020223
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Comprehensive performance prediction and power promotion for wearable thermoelectric generator with flexible encapsulation in practical application

    Liu, Youhong / Shi, Yaoguang / Li, Jing / Guo, Xiaofeng / Wang, Yancheng / Xiang, Qingpei / Guo, Simao / Ze, Rende / Zeng, Jun / Xiang, Yongchun / Hao, Fanhua

    Energy conversion and management. 2020 Sept. 15, v. 220

    2020  

    Abstract: With ability of converting the heat harvested from human body into electricity, the wearable thermoelectric generators (WTEGs) are attracting lots of interests for self-powered electronic devices. However, the output power density of the WTEG is limited ... ...

    Abstract With ability of converting the heat harvested from human body into electricity, the wearable thermoelectric generators (WTEGs) are attracting lots of interests for self-powered electronic devices. However, the output power density of the WTEG is limited for supplying the electronic devices. Therefore, the performance enhancement by optimal design of the developed WTEGs is needed. In this paper, a method of comprehensive modeling of a WTEG is proposed by considering all essential components and realistic boundary conditions. By solving the model with finite element modeling (FEM) method, the calculation performances agree well with experimental results at various temperature difference and load resistance. Through the temperature and voltage distribution of the WTEG obtained, the effects of side heat loss and heat conduction of the encapsulation are revealed. Besides, the impact of the thermal conductivity of encapsulation and the geometric dimensions of thermoelectric legs on the output performance are explored. Finally, the performance prediction results indicate that at the temperature difference of 15 K, the output power of the WTEG with optimized design can be improved about 598.1% with matched loading resistance compared to the device with original design.
    Keywords administrative management ; density ; design ; dimensions ; electric potential difference ; electricity ; electronic equipment ; encapsulation ; energy conversion ; finite element analysis ; geometry ; heat transfer ; humans ; models ; paper ; prediction ; temperature ; thermal conductivity ; thermoelectric generators
    Language English
    Dates of publication 2020-0915
    Publishing place Elsevier Ltd
    Document type Article
    Note NAL-light
    ZDB-ID 2000891-0
    ISSN 0196-8904
    ISSN 0196-8904
    DOI 10.1016/j.enconman.2020.113080
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Nominal power density analysis of thermoelectric pins with non-constant cross sections

    Shi, Yaoguang / Deqing Mei / Haiyan Liu / Yancheng Wang / Zhehe Yao / Zichen Chen

    Energy conversion and management. 2015 June, v. 97

    2015  

    Abstract: The investigation of the geometric structure of TEG (thermoelectric generator) pins is essential, as their geometry determines the performance of devices. In this study, nominal power density (NPD) is used to find a better geometric structure of ... ...

    Abstract The investigation of the geometric structure of TEG (thermoelectric generator) pins is essential, as their geometry determines the performance of devices. In this study, nominal power density (NPD) is used to find a better geometric structure of thermoelectric pins of TEGs, since a comparison of maximum dimensionless efficiencies for different geometric pins cannot be used to identify the optimum geometry. The influence of shape parameter on NPD for TEG pins in linear, quadratic and exponential cross-sectional functions is studied. The NPD decreases when the shape parameter increases for different geometric pins, while the maximum values of NPD are the same. Then, the effects of dimensionless efficiency and the temperature ratio on the NPD are analyzed. The NPD decreases with the increase in dimensionless efficiency and temperature ratio. Pins with linear variation in cross section have the highest NPD among the three geometries of pins evaluated.
    Keywords geometry ; temperature ; thermoelectric generators
    Language English
    Dates of publication 2015-06
    Size p. 1-6.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2000891-0
    ISSN 0196-8904
    ISSN 0196-8904
    DOI 10.1016/j.enconman.2015.02.046
    Database NAL-Catalogue (AGRICOLA)

    Full text online

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