Thermal resistance matching for thermoelectric cooling systems

Lu, Xing; Zhao, Dongliang; Ma, Ting; Wang, Qiuwang; Fan, Jintu; Yang, Ronggui

doi:10.1016/j.enconman.2018.05.052

Cited by 51 publications

(18 citation statements)

References 37 publications

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“… 4)Matching thermal resistances between heat sources and FTE devices, as well as overcoming the mechanical inflexibility of inorganic TE legs via microfabrication. In order to match heat sources, the thermal resistance of FTE devices can be adjusted by optimizing device dimensions and geometry, where finite element analysis could be effective in predicting corresponding thermal resistances . By combining microscale inorganic TE legs into flexible substrates, microfabrication might be an effective way to overcome the mechanical inflexibility of inorganic TEs .…”

Section: Discussionmentioning

confidence: 99%

Flexible Thermoelectric Materials and Generators: Challenges and Innovations

et al. 2019

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The urgent need for ecofriendly, stable, long‐lifetime power sources is driving the booming market for miniaturized and integrated electronics, including wearable and medical implantable devices. Flexible thermoelectric materials and devices are receiving increasing attention, due to their capability to convert heat into electricity directly by conformably attaching them onto heat sources. Polymer‐based flexible thermoelectric materials are particularly fascinating because of their intrinsic flexibility, affordability, and low toxicity. There are other promising alternatives including inorganic‐based flexible thermoelectrics that have high energy‐conversion efficiency, large power output, and stability at relatively high temperature. Herein, the state‐of‐the‐art in the development of flexible thermoelectric materials and devices is summarized, including exploring the fundamentals behind the performance of flexible thermoelectric materials and devices by relating materials chemistry and physics to properties. By taking insights from carrier and phonon transport, the limitations of high‐performance flexible thermoelectric materials and the underlying mechanisms associated with each optimization strategy are highlighted. Finally, the remaining challenges in flexible thermoelectric materials are discussed in conclusion, and suggestions and a framework to guide future development are provided, which may pave the way for a bright future for flexible thermoelectric devices in the energy market.

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Section: Discussionmentioning

confidence: 99%

Flexible Thermoelectric Materials and Generators: Challenges and Innovations

et al. 2019

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“…This implies that the currently available commercial TECs might not be the best choice for the wearable cooling devices. Prior studies have reported a very strong influence of external thermal resistance on the performance of TECs 26–28 , and suggested that the optimal TEC should have internal thermal resistance in the range of 40–70% of the total thermal resistance of the system 29 . However, most of these studies were focused on electronic cooling using TECs.…”

Section: Introductionmentioning

confidence: 99%

Ultra-high performance wearable thermoelectric coolers with less materials

et al. 2019

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Thermoelectric coolers are attracting significant attention for replacing age-old cooling and refrigeration devices. Localized cooling by wearable thermoelectric coolers will decrease the usage of traditional systems, thereby reducing global warming and providing savings on energy costs. Since human skin as well as ambient air is a poor conductor of heat, wearable thermoelectric coolers operate under huge thermally resistive environment. The external thermal resistances greatly influence thermoelectric material behavior, device design, and device performance, which presents a fundamental challenge in achieving high efficiency for on-body applications. Here, we examine the combined effect of heat source/sink thermal resistances and thermoelectric material properties on thermoelectric cooler performance. Efficient thermoelectric coolers demonstrated here can cool the human skin up to 8.2 °C below the ambient temperature (170% higher cooling than commercial modules). Cost-benefit analysis shows that cooling over material volume for our optimized thermoelectric cooler is 500% higher than that of the commercial modules.

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“…Hence, developing sustainable technological solutions based on promising new cooling technologies is getting increasingly important in recent years. Several efficient techniques are under development such as solar [4], thermoelectric [5], magnetocaloric [6], and electrocaloric cooling [7]. The electrocaloric effect (ECE) has recently shown great potential, as the high electric fields required for the refrigeration cycle are easier and less expensive to produce than the other fields required in competitive refrigeration techniques [8,9].…”

Section: Introduction mentioning

confidence: 99%

Enhanced dielectric and electrocaloric properties in lead-free rod-like BCZT ceramics

Hanani¹,

Merselmiz²,

Danine³

et al. 2020

J Adv Ceram

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Ba 0.85 Ca 0.15 Zr 0.10 Ti 0.90 O 3 (BCZT) lead-free ceramics demonstrated excellent dielectric, ferroelectric, and piezoelectric properties at the morphotropic phase boundary (MPB). So far, to study the effect of morphological changes on dielectric and ferroelectric properties in lead-free BCZT ceramics, researchers have mostly focused on the influence of spherical grain shape change. In this study, BCZT ceramics with rod-like grains and aspect ratio of about 10 were synthesized by surfactant-assisted solvothermal route. X-ray diffraction (XRD) and selected area electron diffraction (SAED) performed at room temperature confirm the crystallization of pure perovskite with tetragonal symmetry. Scanning electron microscopy (SEM) image showed that BCZT ceramics have kept the 1D rod-like grains with an average aspect ratio of about 4. Rod-like BCZT ceramics exhibit enhanced dielectric ferroelectric (ε r = 11,906, tanδ = 0.014, P r = 6.01 µC/cm², and E c = 2.46 kV/cm), and electrocaloric properties (ΔT = 0.492 K and  = 0.289 (Kmm)/kV at 17 kV/cm) with respect to spherical BCZT ceramics. Therefore, rod-like BCZT lead-free ceramics have good potential to be used in solid-state refrigeration technology. Keywords: lead-free Ba 0.85 Ca 0.15 Zr 0.10 Ti 0.90 O 3 (BCZT); rod-like Ba 0.85 Ca 0.15 Zr 0.10 Ti 0.90 O 3 (BCZT); dielectric; ferroelectric; electrocaloric effect

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Thermal resistance matching for thermoelectric cooling systems

Cited by 51 publications

References 37 publications

Flexible Thermoelectric Materials and Generators: Challenges and Innovations

Flexible Thermoelectric Materials and Generators: Challenges and Innovations

Ultra-high performance wearable thermoelectric coolers with less materials

Enhanced dielectric and electrocaloric properties in lead-free rod-like BCZT ceramics

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