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曾憲中15

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鄭澤明、曾憲中、黃昱翔、楊博鈞

Paper name：

引擎廢氣熱電轉換系統之設計製造與實機測試

Design, manufacture and performance test of the thermoelectric conversion system installed at a real engine

Name of activity：

中華民國第24屆燃燒與能源學術研討會

ROC 24th Symposium on Combustion and Energy

Keywords：廢熱回收、熱電轉換、實際引擎測驗

Waste heat recovery; thermoelectric conversion; real engine test.

Abstract：隨著熱電技術的開發，相關熱電晶片的應用與研究也愈來愈受重視，引擎系統本身具有加熱源與冷卻源，對熱電晶片德溫差發電提供良好的運用環境，而熱電晶片冷、熱端的溫差愈大，愈能獲得理想的發電功率，要增加溫差，就要利用熱傳增益技術使熱電晶片兩端分別與加熱源與冷卻源產生最佳的熱交換率。本研究整合效率熱傳與熱轉換技術，建構完成實際測試引擎之廢熱電轉換系統放測試平台，採用排氣量為35.8c.c之單缸四行程之小型引擎做為實際測試之高溫廢氣來源，成功量測實際引擎之轉數與外部冷卻風速對引擎排氣溫度與流量的關係，並探討因情轉速與外部冷卻風扇平均風速範圍內，增加外部冷卻風速並會使發電功率(P)增加，目前本研究中4片串聯之熱電產生器模組在引擎轉轉速為6000rpm時，會有4.2W的電功率(P)產出，相關研究結果可做為未來設計小型引擎系統之電轉換系統得重要參考。

The relevant applications and studies of the thermoelectric generators (TEG) are attracting more and more attentions due to the development of the thermoelectric technique. The engine system with both of heating and cooling sources can be the good carrier of the TEG to generate electricity. If the temperature difference between the hot and cold surfaces of the TEG will increase. Therefore, the use of good heat-transfer technique can enhance the generating performance of TEG system. This study integrated the high-performance heat transfer and the thermoelectric techniques to build a thermoelectric conversion device for the waste heat recovery of the real engine exhaust system. A small engine with 35.8 c.c. displacement was employed as the source of high-temperature exhaust. It was successful to investigate the relation ship among the external cooling-air velocity of the real engine coupling with TEG system. The results indicate that increasing rotational speed of engine would enhance the generating electricity. However, within the present scope of external cooling-air velocity, the effect of the external cooling-air velocity on the generating electricity was insignificant. The present four-piece TEG system, installed in the real engine, could generate electricity of 4.2 W at the rotational speed of 6000 rpm. The relevant results can be the design base of TEG system for the small engine.

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