期刊
ENERGY CONVERSION AND MANAGEMENT
卷 197, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2019.111902
关键词
Waste heat recovery; Thermoelectric generation; Perforated plate; Porous medium; Energy harvesting
资金
- Exergy and pumping loss analyses based system design matching method for net power gain maximization of energy harvesting system - National Research Foundation (NRF), Republic of Korea [2018085824]
In this study, thirty of customized bismuth-telluride (Bi2Te3) thermoelectric modules (TEMs) were fabricated for waste heat recovery of a diesel engine using a thermoelectric generator (TEG). By installing a plate-type porous medium whose porosity ranges from 0.121 to 0.516 in the TEG, the effects of the porosity on energy harvesting performance were investigated. Experimental results show that at the highest engine rotation speed of 1400 rpm, a maximum power output of 98.3 W was obtained using the lowest porosity (0.121), and a maximum energy conversion efficiency of 2.83% was obtained using the optimal porosity (0.416). The most significant improvements in the power output and conversion efficiency compared with the base case without porous media were 44.5% and 10.1% with porosities of 0.121 and 0.416, respectively, at the lowest engine speed of 1000 rpm. We concluded that the conversion efficiency and power output of the present TEG can be maximized via application of porous media with porosities of 0.461 and 0.32, respectively. The use of a porous medium with a porosity of < 0.32 in the present TEG configuration should be avoided, as the backpressure would exceed the allowable limit of similar to 3 kPa for a passenger vehicle.
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