Wearable thermoelectric generator for harvesting heat on the curved human wrist

Wearable electronics and sensors for health monitoring are becoming increasingly popular as their functionality continues to grow. Wearable thermoelectric generators (TEGs) are attracting interest due to their ability to self-power these electronic devices or sensors by harvesting human body heat. For wearable TEGs, a flexible thermal interface layer (TIL) is used underneath the TEG for wearing on the human body. The large thermal resistance induced at the interface between the skin and the TEG currently limits improvements in the performance of wearable TEGs and needs to be evaluated. This paper develops a numerical model to investigate the performance of wearable TEGs on the curved human wrist. The TEG and bottom TIL are meshed using rectangular grids and the body-fitted coordinate (BFC) transformation, respectively. Using the finite volume method (FVM), the proposed model is calculated, and the temperature and voltage distributions in the TEG and bottom TIL are analyzed. The effects of the radii of curvature of the curved surface, the material properties, and the thicknesses of the TIL are investigated both numerically and experimentally. The results obtained in this research can be utilized for optimal structural designs for wearable TEGs and for material selection of the TIL to enhance the power generation for self-powered electronics.

[1]  Hamzah Arof,et al.  Effect of Ag content and the minor alloying element Fe on the electrical resistivity of Sn-Ag-Cu solder alloy , 2014 .

[2]  Elena Nicolescu Veety,et al.  Wearable thermoelectric generators for human body heat harvesting , 2016 .

[3]  Tai-Fa Young,et al.  Thermal stress and heat transfer characteristics of a Cu/diamond/Cu heat spreading device , 2009 .

[4]  S. E. Jo,et al.  Flexible thermoelectric generator for human body heat energy harvesting , 2012 .

[5]  James W. Evans,et al.  Printed flexible thermoelectric generators for use on low levels of waste heat , 2015 .

[6]  Chih-Ming Chen,et al.  Improvement of thermal management of high-power GaN-based light-emitting diodes , 2012, Microelectron. Reliab..

[7]  Chris Van Hoof,et al.  Realization of a wearable miniaturized thermoelectric generator for human body applications , 2009 .

[8]  B. Cho,et al.  Post ionized defect engineering of the screen-printed Bi2Te2.7Se0.3 thick film for high performance flexible thermoelectric generator , 2017 .

[9]  Ivo Babuška,et al.  On the Rates of Convergence of the Finite Element Method , 1982 .

[10]  Mehmet C. Öztürk,et al.  Flexible thermoelectric generator using bulk legs and liquid metal interconnects for wearable electronics , 2017 .

[11]  Luca Benini,et al.  Human body heat for powering wearable devices: From thermal energy to application , 2017 .

[12]  Tae June Kang,et al.  Flexible thermocells for utilization of body heat , 2014, Nano Research.

[13]  Mehmet C. Öztürk,et al.  Designing thermoelectric generators for self-powered wearable electronics , 2016 .

[14]  Tiejun Zhu,et al.  Enhanced thermoelectric performance of n-type PbTe bulk materials fabricated by semisolid powder processing , 2014 .

[15]  B. Cho,et al.  A wearable thermoelectric generator fabricated on a glass fabric , 2014 .

[16]  P. Lu,et al.  Isolation of Live Premature Senescent Cells Using FUCCI Technology , 2016, Scientific Reports.

[17]  Tiejun Zhu,et al.  Microstructure and thermoelectric properties of porous Bi_2Te_2.85Se_0.15 bulk materials fabricated by semisolid powder processing , 2015 .

[18]  Lin Yuanhui,et al.  フォトレジスト上のパリレンC(POP):ポリマー/金属ナノワイヤ製造のための低温スペーサ技術 , 2011 .

[19]  Chang Ming Li,et al.  Silk fabric-based wearable thermoelectric generator for energy harvesting from the human body , 2016 .

[20]  Bill J. Van Heyst,et al.  Thermal energy harvesting from the human body using flexible thermoelectric generator (FTEG) fabricated by a dispenser printing technique , 2016 .

[21]  Liu Meie,et al.  液晶エラストマー片持梁の光‐熱‐機械的駆動の曲げとスナップ動力学 , 2014 .

[22]  B. Cho,et al.  High-Performance Flexible Thermoelectric Power Generator Using Laser Multiscanning Lift-Off Process. , 2016, ACS nano.

[23]  Chulki Kim,et al.  Wearable thermoelectric generator for harvesting human body heat energy , 2014 .

[24]  Muhammad Mustafa Hussain,et al.  Paper-based origami flexible and foldable thermoelectric nanogenerator , 2017 .

[25]  Christian J.L. Hermes,et al.  Numerical assessment of the thermodynamic performance of thermoelectric cells via two-dimensional modelling , 2014 .

[26]  Keishi Nishio,et al.  Selection and Evaluation of Thermal Interface Materials for Reduction of the Thermal Contact Resistance of Thermoelectric Generators , 2014, Journal of Electronic Materials.

[27]  Li Shi,et al.  High fidelity finite difference model for exploring multi-parameter thermoelectric generator design space , 2014 .

[28]  Vladimir Leonov,et al.  Thermoelectric energy harvester on the heated human machine , 2011 .

[29]  Kazuhide Ito,et al.  Numerical and experimental estimation of convective heat transfer coefficient of human body under strong forced convective flow , 2014 .

[30]  Tiejun Zhu,et al.  Realizing high figure of merit in heavy-band p-type half-Heusler thermoelectric materials , 2015, Nature communications.

[31]  Dawen Li,et al.  Modelling of segmented high-performance thermoelectric generators with effects of thermal radiation, electrical and thermal contact resistances , 2016, Scientific Reports.

[32]  Shannon K. Yee,et al.  Design of a polymer thermoelectric generator using radial architecture , 2016 .

[33]  G. Sun,et al.  Global pattern for the effect of climate and land cover on water yield , 2015, Nature Communications.