Abstract
Recovering the waste heat is important to improve fuel efficiency of a hybrid electric vehicle. In this study, waste heat recovery systems such as organic Rankine cycles (ORC) and thermoelectric generators (TEG) were applied to a series hybrid electric vehicle with a lean burn SI engine that can be operated at an excess air ratio of 2.0. The effects of waste heat recovery systems on fuel economy were evaluated by using one-dimensional numerical simulation. The improvement of fuel economy using ORC and TEG was 2.67% and 1.14%, respectively. ORC was more effective in improving fuel economy than the TEG.
