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標題: 以熱電模組進行引擎廢熱回收之考量
Some considerations in the thermal energy recovery of engine exhaust with thermoelectric module
作者: 林繼弘
Lin, Chi-Hung
關鍵字: exhaust heat recovery;排氣廢熱回收;thermoelectric modules;vehicle exhaust;熱電模組;車輛排氣
出版社: 機械工程學系所
引用: [1] K. M. saqr ,M. K. mansour, thermal design of automobile exhaust based thermoelectric generators: objectives and challenges [2] [3] Ioffe, A.F., Semiconductor Thermoelements and Thermoelectric Cooling,Infosearch, London, 1957. [4] Goldsmid, H. J., The use of semiconductors in thermoelectric refrigeration,Research Laboratories, The General Electric Co. Ltd, Wembley, Middlesex, 1954 [5] [6] Jau-Huai Lu,Chi-Hung Lin,Heat transfer rate and efficiency of thermoelectric heat pumps equipped with fins at both sides. ACRA(2010) [7]林克衛,熱電材料在汽車廢熱回收的應用,2006 [8]陳洋元,高效率熱電材料的研發,中研院,2008 [9] Linda K. Boukai, Deposition thickness based high-throughput nano-imprint template, Volume: 84, Issue: 4, April, 2007, pp. 594-598 [10] Allon I. Hochbaum et al, Nature 451, 163-167 (2008) [11] Birkholz, U., et al. "Conversion of Waste Exhaust Heat in Automobile using FeSi2 Thermoelements". Proc. 7th International Conference on Thermoelectric Energy Conversion. 1988, Arlington, USA, pp. 124-128. [12] J. C. Bass, N. B. Elsner’Performance of the 1 kW Thermoelectric Generator for Diesel Engines’, Hi-Z Technology, Inc [13] Morelli, D.T., Potential applications of advanced thermoelectrics in the automobile industry. In Proceedings of the 15th International Conference on Thermoelectrics, J.-P. Fleurial, ed., p. 383,1996. [14] S.B. Riffat , Xiaoli Ma, Thermoelectrics: a review of present and potential applications, Applied Thermal Engineering 23 (2003) 913–935 [15] K.M.Saqr, M.K.Mansour ,Thermal designof automobile exhaust based thermoelectric generators:objecyives and challenges ,International Journal of Automotive Engineers(2008) [16 Jensak Eakburanawat, Itsda onyaroonate ,Development of a thermoelectric battery-charger with microcontroller-based maximum power, Applied Energy point tracking technique,83 (2006) 687–704 [18] Serksnis, A.W. "Thermoelectric Generator for Automotive Charging System". Proc. 11th Intersociety Conversion Engineering Conference. 1976, New York, USA, pp. 1614-1618. [19] John W. Thermoelectric developmentsfor vehicular applications, (DEER) Conference Detroit, MIAugust 24, 2006 [20]John Fairbanks,Vehicular Applicationso Thermoelectrics,(DEER) Conference Dearborn, Michigan August 4-7,2008 [21] Soo, S.L., Direct Energy Conversion, Prentice Hall, 1968. [22]D.M.Rowe,Coefficient of Performance and Heat Pumping Capacity Thermoelectrics handbook,(2005)173-176. [23] D.M.Rowe,Coefficient of Performance and Heat Pumping Capacity Thermoelectrics handbook,(2005)142-146 [24] D.M.Rowe,Coefficient of Performance and Heat Pumping Capacity Thermoelectrics handbook,(2005)147-149 [25] Holman, J.P., Heat Transfer, McGraw Hill, 2005 [26] D.M.Rowe,Coefficient of Performance and Heat Pumping Capacity Thermoelectrics handbook,(2005)30-33 [27] Jones, William; March, Norman H. (1985). Theoretical Solid State Physics. Courier Dover Publications [28] D.M.Rowe,Coefficient of Performance and Heat Pumping Capacity Thermoelectrics handbook,(2005)152-153 [29] John W. Fairbanks, Vehicular Thermoelectrics Applications Overview, U.S. Department of Energy, August 15, 2007 [30] John Fairbanks vehicular applications of Thermoelectrics, (DEER) Conference Detroit, MI August 4-7, 2008,p34 [31] 技術在線: [32] John Fairbanks vehicular applications of Thermoelectrics, (DEER) Conference Detroit, MI August 4-7, 2008 [33] 技術在線: [34] John W. Thermoelectric developmentsfor vehicular applications, (DEER) Conference Detroit, MIAugust 4-7, 2008,p45~50 [35] Rasit Ahiska, the study of thermoemf effect on exit parameters of thermoelectric modules, International Conference “Fizika-2005”,page 144-148 [36]. Kin-ichi U, 1995 Commercial Peltier ModulesCRC Handbook of Thermoelectrics ed D. M .Rowe(Florida: CRC Pres. Inc) pp 621-631 [37] 盧昭暉,林繼弘,集中式太陽能熱電模組轉換效率之評估,中國機械工程研討會(2009) [38] Jau-Huai Lu, Lin, Heat transfer rate and efficiency of thermoelectric heat pumps equipped with fins at both sides, Proceedings of 5th ACRA,June 7-9, 2010, Tokyo, JAPAN [39] 趙士傑,廖智偉,林繼弘,壁掛式熱電冷氣與熱泵雙用機(2010萬潤盃創意競賽佳作)
本文主要探討回收車輛排氣廢熱,再利用熱電模組將熱能轉換為電能的轉換效率。整個系統的架構包括熱交換器,鰭片,與熱電模組。將鰭片裝置於熱交換器內部,熱電模組黏貼於鰭片外部,排氣廢熱經由鰭片吸收部分熱能,加熱於熱電模組一端,冷卻水由熱電模組另一端流過,熱電模組利用兩者的溫差發電。本文以市售的熱電模組晶片來進行設計,首先由目標引擎排氣流量與排氣溫度來計算熱交換器的壁面溫度,做為熱電模組的熱端溫度,再利用熱電模組晶片的規格計算加熱端以及冷卻端熱傳量,以及電能轉換之效率。本文目標引擎為2835c.c的柴油引擎以及124.6c.c的電子噴射式機車引擎,並搭配三種設計型式的熱交換器,本文發現在熱電模組負載系數m=1,熱交換器Type_A & Type_B內部截面積47.4cm2,排氣溫度800K與673K,冷卻水溫313K與298K時,發電效率為7.9%與0.52%,熱電模組對外輸出功率為446.2W與0.65W,熱電模組內部損失以熱傳損失以及電阻損失為主。若提高排氣溫度至1000K,則輸出功率可增加為881.73W與2.65W,若提高冷卻水溫至363K,則輸出功率降為356.56W與0.43W,熱交換器內的散熱鰭片數目增加,輸出功率可增加為528.49W與57.15W,熱交換器的長度增加,輸出功率可增加為519.22W與0.99W。

This paper focuses on recovering the thermal energy of vehicle exhaust to convert heat to generate power by thermoelectric module and discusses the power conversion efficiency. The entire system includes heat exchanger, fins, and thermoelectric modules. The fin was set inside the heat exchanger, the thermoelectric modules were attached on the surface of the fin, and part of the exhaust heat was absorbed by the fins. Heat transfers to one side of the thermoelectric modules, and the coolant water flows from the other side through the thermoelectric module. The thermoelectric module generates electricity with the temperature differences. In this article, we established the model by using the normal thermoelectric module chip. First, we use the temperature of heat exchanger wall calculated by the exhaust flow rate and the exhaust temperature as the temperature of the hot side of the thermoelectric module. Then we calculate the heat transfer rate of the hot side and cool side, and the transferring efficiencies. In this article there are two type engines to be evaluated, one is 2835c.c diesel engine and the other one is 124.6c.c motobike inject engine and install three different type heat exchangers. We found the power generation efficiencies are 7.9% & 0.52% when the thermoelectric modules load resistance factor m = 1, heat exchanger Type_A & Type_B which internal sectional areas are both 47.4cm2 , the exhaust temperatures are 800K & 673K, temperatures of coolant water are 313K & 298K, and the output power efficiencies are 446.2W & 0.65W. The major internal losses of thermoelectric modules are thermal transfer losses and the loss of the resistance. If we increase the exhaust temperature to 1000K, then the generation power can be increased to 881.73 & 2.65W; increasing the coolant water temperature to 363K, then the generation power are reduced to 356.56W & 0.43W. The output efficiencies will be increased to 528.49W & 57.15W if the number of the fin increases. The output efficiency will be 519.22W & 0.99W when the length of exhaust pipe increases.
In this article we use the designing of heat exchanger Type_B to carry on the experiment, in result when the engine at 4500RPM, the exhaust gas which inlet heat exchanger is 724K and the exhaust gas temperature of heat exchanger outlet is 410K. We found the output voltage of TEG system is 6.48V and power generation efficiency is 3.11W, the temperature alone the heat exchanger is 442.5K, the temperature of coolant water is 320K. The heat energy recovery efficiency of whole system is 0.38%. The key aspect to effect the efficiency are the quantity of TEM, the length of heat exchanger, the number of the fin and the operation conditions of engine.
其他識別: U0005-0607201014410600
Appears in Collections:機械工程學系所

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