Waste Heat Recovery via Thermoelectric Generation in a Natural Gas Engine: Numerical Modeling and Baseline Analysis

Ratnak Sok*, Jin Kusaka, Hisaharu Nakashima, Hidetaka Minagata


研究成果: Conference article査読


The thermoelectric generator (TEG) can recover a fraction of exhaust energy loss from the automotive exhaust gas. However, its application is limited due to the pumping losses and turbocharger efficiency drop when the engine system is equipped with the TEG. This research aims to optimize the thermal efficiency of a compressed natural gas engine (CNG) system with the TEG mounted after a turbocharger via numerical modeling. The total engine model with the integrated thermoelectric module (TEM) and heat exchanger is developed in a commercial simulation tool. Measured data from the corrugated fin type heat exchanger TEG experiments under different fin pitches, gas temperatures, and mass flow rates are used for validating the TEG model. The TEG's heat exchanger modeling considers pressure differences at inlet and outlet, heat transfer coefficients from gas to wall, exchanger wall temperature, and the module heat flux. The model can predict the module's pressure loss and heat transfer characteristics. Next, the TEG model is integrated into a production type 3.0 L CNG engine model operated under spark ignition mode. The engine model was well calibrated with various measured data taken from a turbocharged, mass-production engine used in light-duty delivery CNG trucks. The effectiveness of the integrated engine and TEG model is demonstrated by focusing on engine brake thermal efficiency enhancement using waste heat recovery via thermoelectric generation. Finally, the engine system's thermal efficiency could be improved by up to 0.8 % without significant brake power loss.

ジャーナルProceedings of the Thermal and Fluids Engineering Summer Conference
出版ステータスPublished - 2022
イベント7th Thermal and Fluids Engineering Conference, TFEC 2022 - Las Vegas, United States
継続期間: 2022 5月 152022 5月 18

ASJC Scopus subject areas

  • 再生可能エネルギー、持続可能性、環境
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • 機械工学
  • 流体および伝熱
  • 電子工学および電気工学


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