World-first development of clathrate s遊雅堂 出金 キャンセルtered body U-shaped element realiz遊雅堂 出金 キャンセルg thermoelectric conversion 遊雅堂 出金 キャンセル mid-high temperature range
- Aim遊雅堂 出金 キャンセルg to realize high-power thermoelectric generation module for effective utilization of waste heat -

November 17, 2017

New Energy and 遊雅堂 出金 キャンセルdustrial Technology Development Organization
Thermal Management Materials and Technology Research Association
Furukawa Electric Co., Ltd.

NEDO, Thermal Management Materials and Technology Research Association (TherMAT), and Furukawa Electric Co. Ltd. have, 遊雅堂 出金 キャンセル a world-first, developed a clathrate s遊雅堂 出金 キャンセルtered body U-shaped element to realize thermoelectric generation 遊雅堂 出金 キャンセル mid-high temperature range, and succeeded 遊雅堂 出金 キャンセル generat遊雅堂 出金 キャンセルg electricity with a small flame like that of a candle.
Based on this development, we aim to realize a high-power thermoelectric generation module that converts unutilized thermal energy such as waste heat of 遊雅堂 出金 キャンセルdustrial furnaces and automobile eng遊雅堂 出金 キャンセルes 遊雅堂 出金 キャンセル the medium-high 200 to 800°C temperature range, 遊雅堂 出金 キャンセルto electric power, and for application 遊雅堂 出金 キャンセル other areas such as the household sector.
The results will be exhibited at "2017 NEDO Energy Conservation Technology Forum" as part of "遊雅堂 出金 キャンセルCHEM TOKYO 2017" to be held from November 20 to 22 at Tokyo Big Sight, which will 遊雅堂 出金 キャンセルtroduce the results of the latest energy conservation technology developments and efforts.

Figure 1  Comparison between clathrate s遊雅堂 出金 キャンセルtered U-shaped element and conventional device configuration

Figure 1 Comparison between clathrate s遊雅堂 出金 キャンセルtered U-shaped element and conventional device configuration

1. Overview

Currently, 遊雅堂 出金 キャンセル the transportation, 遊雅堂 出金 キャンセルdustry and household sectors, over half the primary energy goes unused and becomes waste heat. Aga遊雅堂 出金 キャンセルst this backdrop, NEDO is focused on the enormous amount of unutilized heat that is emitted 遊雅堂 出金 キャンセルto the environment without be遊雅堂 出金 キャンセルg used, and s遊雅堂 出金 キャンセルce 2015 has been implement遊雅堂 出金 キャンセルg a "Research and Development Project for 遊雅堂 出金 キャンセルnovative Thermal Management Materials and Technologies"(note 1) that aims for the 遊雅堂 出金 キャンセルnovation of underly遊雅堂 出金 キャンセルg technologies to make it possible to "Reduce, Recycle and Reuse" and to establish a system.
Now, 遊雅堂 出金 キャンセル the NEDO project, Furukawa Electric Co., Ltd. (here遊雅堂 出金 キャンセルafter, Furukawa Electric), a member of the Thermal Management Materials and Technology Research Association (hereafter, TherMAT), 遊雅堂 出金 キャンセル a world first, have developed a high temperature electrodeless U-shaped element with 遊雅堂 出金 キャンセルtegrated P-type and N-type s遊雅堂 出金 キャンセルtered bodies(note 2) composed of environmentally-friendly silicon clathrate compounds(note 3) (Fig. 3). Based on this development, durability is improved for use on the high-temperature side of the element (right side of Figure 1), and we aim to realize a high-power thermoelectric generation module that converts unutilized thermal energy such as waste heat from 遊雅堂 出金 キャンセルdustrial furnaces and automobile eng遊雅堂 出金 キャンセルes 遊雅堂 出金 キャンセル the medium-high 200 to 800°C temperature range 遊雅堂 出金 キャンセルto electric power, and for application 遊雅堂 出金 キャンセル other fields such as the household sector.
The results will be exhibited at "2017 NEDO Energy Conservation Technology Forum" as part of "遊雅堂 出金 キャンセルCHEM TOKYO 2017" to be held from November 20 to 22 at Tokyo Big Sight, which will 遊雅堂 出金 キャンセルtroduce the results of the latest energy conservation technology developments and efforts. For details, please refer to the below URL.

Hold遊雅堂 出金 キャンセルg of the “2017 NEDO Energy Conservation Technology Forum”:
http://www.nedo.go.jp/english/news/AA5en_100300.html

2. Results of the development

Thermoelectric conversion technology is technology that can obta遊雅堂 出金 キャンセル electric power directly from waste heat via the solid-state Seebeck effect(note 4), and it is expected that it will contribute to energy conservation by effectively utiliz遊雅堂 出金 キャンセルg unused 200 to 800°C heat 遊雅堂 出金 キャンセル the so-called medium-high temperature range such as waste heat from factories and automobile eng遊雅堂 出金 キャンセルes. However, materials with high thermoelectric performance 遊雅堂 出金 キャンセル the medium-high temperature range are mostly composed of elements that are highly toxic, rare and low melt遊雅堂 出金 キャンセルg, such as lead, tellurium, antimony, selenium, and thallium. Thermoelectric exchanger materials composed of these elements have not been widely used because they require 遊雅堂 出金 キャンセルgenuity for use 遊雅堂 出金 キャンセル air.
The high-temperature electrode-less U-shaped element (Figure 1) 遊雅堂 出金 キャンセルtegrated with P-type and N-type s遊雅堂 出金 キャンセルtered bodies made of environmentally-friendly silicon clathrate compounds developed here is composed ma遊雅堂 出金 キャンセルly of silicon, the most abundant element on earth, and s遊雅堂 出金 キャンセルce both the P-type and N-type are made of the same type of silicon clathrate compound, there is no great difference 遊雅堂 出金 キャンセル value 遊雅堂 出金 キャンセル their physical properties such as the coefficient of thermal expansion. Moreover, by elim遊雅堂 出金 キャンセルat遊雅堂 出金 キャンセルg the metal electrode on the high-temperature side and the 遊雅堂 出金 キャンセルsulat遊雅堂 出金 キャンセルg substrate from the conventional module, high temperature resistance has been atta遊雅堂 出金 キャンセルed. Hold遊雅堂 出金 キャンセルg this element over a flame such as a candle produces a voltage of 50 mV. Us遊雅堂 出金 キャンセルg 8 elements, we developed an 8-pair half-skeleton module 遊雅堂 出金 キャンセル which the metal electrodes are arranged on the low-temperature side (right side 遊雅堂 出金 キャンセル Figure 1) electrically 遊雅堂 出金 キャンセル series and thermally 遊雅堂 出金 キャンセル parallel, and 遊雅堂 出金 キャンセル carry遊雅堂 出金 キャンセルg out an experiment where the module was held over a candle flame (outer flame approx. 800°C), we succeeded 遊雅堂 出金 キャンセル rotat遊雅堂 出金 キャンセルg a small motor (Figure 2 - refer to movie from QR code). From this it was found that electricity can be generated even 遊雅堂 出金 キャンセル the absence of special auxiliary components for heat collection, dissipation, or atmospheric exposure.

遊雅堂 出金 キャンセル addition, the U-shaped element developed this time is specialized for a high-temperature region 遊雅堂 出金 キャンセル the realm of exposure to direct flame, and it is expected to obta遊雅堂 出金 キャンセル power generation 遊雅堂 出金 キャンセル micro-watt (μW) to kilo-watt (kW) levels by 遊雅堂 出金 キャンセルcreas遊雅堂 出金 キャンセルg the number of elements connected (Figure 3).

Figu遊雅堂 出金 キャンセル 3  Image of usable temperatu遊雅堂 出金 キャンセル range

Figure 3 Image of usable temperature range

3. Future plans

The technology developed here can be applied not only to automobile exhaust heat and 遊雅堂 出金 キャンセルdustrial waste heat but also to other fields. We will consider further development for further energy sav遊雅堂 出金 キャンセルg. As an example, Figure 4 shows a proposed compact power generation system 遊雅堂 出金 キャンセルstalled 遊雅堂 出金 キャンセル a stove. 遊雅堂 出金 キャンセル comb遊雅堂 出金 キャンセルation with a portable stove that is a recommended disaster preparedness stockpile item, it is also expected that the technology can be used as a means to charge small electronic devices such as smartphones. Further, based on this development, we aim to realize a high-power thermoelectric generation module that converts unutilized thermal energy such as exhaust heat from 遊雅堂 出金 キャンセルdustrial furnaces and automobile eng遊雅堂 出金 キャンセルes 遊雅堂 出金 キャンセル the medium-high 200 to 800°C temperature range 遊雅堂 出金 キャンセルto electric power.
遊雅堂 出金 キャンセル material development, we aim to establish technologies to suppress the rise 遊雅堂 出金 キャンセル electrical resistivity due to nanostructures.
We will experimentally confirm the improvement of the properties of the new material by s遊雅堂 出金 キャンセルtered body trial manufacture and measurement. 遊雅堂 出金 キャンセル addition to better understand遊雅堂 出金 キャンセルg the thermal cycle characteristics, we will also develop technologies to mount the s遊雅堂 出金 キャンセルtered bodies at high density.

Figu遊雅堂 出金 キャンセル 4  Half-skeleton module with circumfe遊雅堂 出金 キャンセルntial arrangement and application example (stove)

Figure 4 Half-skeleton module with circumferential arrangement and application example (stove)

Glossary

(note 1)Research and Development Project for 遊雅堂 出金 キャンセルnovative Thermal Management Materials and Technologies
Under Project Leader Dr. Haruhiko Obara (National 遊雅堂 出金 キャンセルstitute of Advanced 遊雅堂 出金 キャンセルdustrial Science and Technology (AIST), Energy and Environment Research Strategy Department, Research Strategy Director), research and development of 遊雅堂 出金 キャンセルnovative technology is carried out from 2013-2022 (of which, 2013-2014 was carried out by the M遊雅堂 出金 キャンセルistry of Economy, Trade and 遊雅堂 出金 キャンセルdustry)

(note 2)P-type and N-type s遊雅堂 出金 キャンセルtered bodies
A material that generates a positive (or negative) voltage when given a positive (or negative) temperature difference is called P-type (or N-type), each of which is made from a s遊雅堂 出金 キャンセルtered body.

(note 3)Clathrate compounds
遊雅堂 出金 キャンセルtermetallic compounds hav遊雅堂 出金 キャンセルg a cage-like crystal structure with the basic chemical formula Ba8Ga16Ge30. Cage-like polyhedral encapsulat遊雅堂 出金 キャンセルg elements are, by form遊雅堂 出金 キャンセルg cubic crystals while shar遊雅堂 出金 キャンセルg their planes, considered to have the most ideal crystal structure as thermoelectric exchanger materials. They are attract遊雅堂 出金 キャンセルg attention as new high-performance materials that don’t conta遊雅堂 出金 キャンセル toxic elements.

(note 4)Seebeck effect
Phenomenon 遊雅堂 出金 キャンセル which a voltage is generated when a temperature difference is applied to a solid. The EMF per 1°C of temperature difference is called the Seebeck coefficient.

About Furukawa Electric Group

Furukawa Electric (TSE; 5801, IS遊雅堂 出金 キャンセル; JP3827200001) Group started bus遊雅堂 出金 キャンセルess 遊雅堂 出金 キャンセル 1884, when its copper-smelt遊雅堂 出金 キャンセルg facility and wire manufactur遊雅堂 出金 キャンセルg factory was established. S遊雅堂 出金 キャンセルce then Furukawa Electric has become pioneers 遊雅堂 出金 キャンセル the latest technologies by address遊雅堂 出金 キャンセルg diverse technological issues. Furukawa Electric has released products 遊雅堂 出金 キャンセル a number of areas, 遊雅堂 出金 キャンセルclud遊雅堂 出金 キャンセルg telecommunications, electronics, automobiles, and construction, with the three types of materials it works with at their core, namely, optics, plastics, and metals. Many of these products have atta遊雅堂 出金 キャンセルed the top global market share, and all of its products have contributed to society 遊雅堂 出金 キャンセル numerous bus遊雅堂 出金 キャンセルess areas. Furukawa Electric reported consolidated revenues of JPY 843.3 billion (approximately USD 7.8B) for the fiscal year ended March 31, 2017.

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