THERMOELECTRIC GENERATION FROM EXHAUST HEAT IN ELECTRIFIED NATURAL GAS TRUCKS - PART1: MODELING AND ANALYSIS ON ENGINE SYSTEM EFFICIENCY IMPROVEMENT

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

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Thermoelectric generator (TEG) effectiveness in boosting hybridized, compressed natural gas (CNG) 3.0 L engines is demonstrated using a model-based development approach. Measured data from the corrugated fin-type TEG under different gas temperatures and mass flow rates are used for validating the model. The accurate TEG model can reproduce measured pressure loss, heat transfer, and thermal performance characteristics. Next, the model is integrated into the spark ignited CNG engine. Predicted engine performances are well-calibrated with measured data from the twin-turbocharged, mass-production engine used in light-duty delivery trucks. The engine model is validated with measured data for 35 conditions under the JE05 cycle (800-2800 RPM, 2.6 - 102 kW). The results show that the engine brake thermal efficiency (BTE) is improved by 0.56% using a 7× TEG module arrangement. A × 10 arrangement can enhance the BTE to 0.8%. Effective electrical power is generated up to 1.168 kW from the TEG, depending on JE05 operating regions, without significant power loss.

Original languageEnglish
Title of host publicationEnergy
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791886687
DOIs
Publication statusPublished - 2022
EventASME 2022 International Mechanical Engineering Congress and Exposition, IMECE 2022 - Columbus, United States
Duration: 2022 Oct 302022 Nov 3

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
Volume6

Conference

ConferenceASME 2022 International Mechanical Engineering Congress and Exposition, IMECE 2022
Country/TerritoryUnited States
CityColumbus
Period22/10/3022/11/3

Keywords

  • CNG hybrid engine
  • Thermoelectric generator
  • system efficiency
  • waste heat recovery

ASJC Scopus subject areas

  • Mechanical Engineering

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