Mat-like flexible thermoelectric system based on rigid inorganic bulk materials

This paper reports on a mat-like flexible thermoelectric system (FTES) based on rigid inorganic bulk materials, i.e. Bi?Te compounds. Inorganic bulk materials exhibit higher thermoelectric performance and can create a larger temperature drop due to their considerable height compared with organics and printable inorganics, meaning the FTES can produce an impressive power output. We show that the FTES, wherein both a thermoelectric module and a heat sink are integrated, is flexible enough to be adapted to any irregularly shaped surface. In the FTES, p- and n-type legs composed of a thermoelectric module are placed inside holders, which are connected to one another using flexible wires. Powered by a portable battery, the FTES was used to refrigerate human skin. As a result, a temperature drop of approximately 4?K was experimentally demonstrated, which humans felt as 'cold' or 'very cold', based on analysis. This indicates the feasibility of using the proposed FTES to control the temperature of the human body, even when using a portable battery. This was also applied to body heat harvesting. The FTES generated approximately 88 ?W of power, which is sufficient to operate most wearable and/or implantable sensors. Our analysis based on human thermoregulatory modeling indicates that both refrigeration and power generation capacity can be further enhanced by improving the thermal contact between the FTES and human skin. The FTES shows potential for wearable refrigeration and body heat harvesting.

[1]  Gao Min,et al.  Experimental evaluation of prototype thermoelectric domestic-refrigerators , 2006 .

[2]  X. Crispin,et al.  Optimization of the thermoelectric figure of merit in the conducting polymer poly(3,4-ethylenedioxythiophene). , 2011, Nature materials.

[3]  H. Zhang,et al.  Human thermal sensation and comfort in transient and non-uniform thermal environments , 2003 .

[4]  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 .

[5]  P. Wright,et al.  High-performance dispenser printed MA p-type Bi(0.5)Sb(1.5)Te(3) flexible thermoelectric generators for powering wireless sensor networks. , 2013, ACS applied materials & interfaces.

[6]  Jun Zhang,et al.  A two level finite difference scheme for one dimensional Pennes' bioheat equation , 2005, Appl. Math. Comput..

[7]  C. Huizenga,et al.  Thermal sensation and comfort in transient non-uniform thermal environments , 2004, European Journal of Applied Physiology.

[8]  Hyeung-Sik Choi,et al.  Development of a temperature-controlled car-seat system utilizing thermoelectric device , 2007 .

[9]  A. Gage,et al.  Mechanisms of tissue injury in cryosurgery. , 1998, Cryobiology.

[10]  K. Lomas,et al.  Computer prediction of human thermoregulatory and temperature responses to a wide range of environmental conditions , 2001, International journal of biometeorology.

[11]  P. Han,et al.  Cryosurgery would be An Effective Option for Clinically Localized Prostate Cancer: A Meta-analysis and Systematic Review , 2016, Scientific Reports.

[12]  K. Kurata,et al.  The cooling performance of a cryoprobe: establishing guidelines for the safety margins in cryosurgery. , 2016 .

[13]  Saffa Riffat,et al.  Comparative investigation of thermoelectric air-conditioners versus vapour compression and absorption air-conditioners , 2004 .

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

[15]  Byung Jin Cho,et al.  Hybrid composite of screen-printed inorganic thermoelectric film and organic conducting polymer for flexible thermoelectric power generator , 2014 .

[16]  D. Bharathan,et al.  Predicting human thermal comfort in a transient nonuniform thermal environment , 2004, European Journal of Applied Physiology.

[17]  Takao Ishida,et al.  Polymer thermoelectric modules screen-printed on paper , 2014 .

[18]  Kyle Pietrzyk,et al.  Power generation modeling for a wearable thermoelectric energy harvester with practical limitations , 2016 .

[19]  Youn Tae Kim,et al.  Feasibility study on application of power transmission using magnetic coupling to body area network , 2012 .

[20]  Joseph Richardson,et al.  High-performance and flexible thermoelectric films by screen printing solution-processed nanoplate crystals , 2016, Scientific Reports.

[21]  Eunkyoung Kim,et al.  Preparation of Bismuth Telluride Films with High Thermoelectric Power Factor. , 2016, ACS applied materials & interfaces.

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

[23]  Dawei Liu,et al.  BiSbTe‐Based Nanocomposites with High ZT: The Effect of SiC Nanodispersion on Thermoelectric Properties , 2013 .

[24]  Ravi Prasher,et al.  Thermal Interface Materials: Historical Perspective, Status, and Future Directions , 2006, Proceedings of the IEEE.

[25]  K. Zhang,et al.  Engineered doping of organic semiconductors for enhanced thermoelectric efficiency. , 2013, Nature materials.

[26]  M. Dresselhaus,et al.  High-Thermoelectric Performance of Nanostructured Bismuth Antimony Telluride Bulk Alloys , 2008, Science.

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

[28]  Luca Francioso,et al.  Flexible thermoelectric generator for ambient assisted living wearable biometric sensors , 2011 .

[29]  H. Anno,et al.  Novel Hybrid Organic Thermoelectric Materials:Three‐Component Hybrid Films Consisting of a Nanoparticle Polymer Complex, Carbon Nanotubes, and Vinyl Polymer , 2015, Advanced materials.

[30]  S. Beeby,et al.  Screen printed flexible Bi2Te3-Sb2Te3 based thermoelectric generator , 2013 .

[31]  Win-Li Lin,et al.  Analytical analysis of the Pennes bioheat transfer equation with sinusoidal heat flux condition on skin surface. , 2007, Medical engineering & physics.

[32]  Ji-Hui Yang,et al.  Automotive Applications of Thermoelectric Materials , 2009 .

[33]  Yani Chen,et al.  Solution processed organic thermoelectrics: towards flexible thermoelectric modules , 2015 .

[34]  Claire M. Lochner,et al.  Monitoring of Vital Signs with Flexible and Wearable Medical Devices , 2016, Advanced materials.

[35]  K. Lomas,et al.  A computer model of human thermoregulation for a wide range of environmental conditions: the passive system. , 1999, Journal of applied physiology.

[36]  Lingai Luo,et al.  An experimental and numerical study of a thermoelectric air-cooling and air-heating system , 2008 .

[37]  V. Leonov.  Human Machine and Thermoelectric Energy Scavenging for Wearable Devices , 2011 .

[38]  W. Jo,et al.  High-performance shape-engineerable thermoelectric painting , 2016, Nature Communications.

[39]  D. Rowe.  CRC Handbook of Thermoelectrics , 1995 .

[40]  H. Hng,et al.  Fabrication of flexible thermoelectric thin film devices by inkjet printing. , 2014, Small.

[41]  G. J. Snyder,et al.  Dense dislocation arrays embedded in grain boundaries for high-performance bulk thermoelectrics , 2015, Science.

[42]  J. Bahk,et al.  Flexible thermoelectric materials and device optimization for wearable energy harvesting , 2015 .

[43]  Daoben Zhu,et al.  Organic Thermoelectric Materials and Devices Based on p‐ and n‐Type Poly(metal 1,1,2,2‐ethenetetrathiolate)s , 2012, Advanced materials.

[44]  D. Astrain,et al.  Increase of COP in the thermoelectric refrigeration by the optimization of heat dissipation , 2003 .