Evaluation of electrical energy recovery from exhaust waste heat energy by thermoelectric generator under stationary operating conditions of an SI engine
APPLIED THERMAL ENGINEERING, cilt.1, sa.1, ss.1-13, 2025 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 1 Sayı: 1
- Basım Tarihi: 2025
- Doi Numarası: 10.1016/j.applthermaleng.2025.127715
- Dergi Adı: APPLIED THERMAL ENGINEERING
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, PASCAL, Aerospace Database, Business Source Elite, Business Source Premier, Communication Abstracts, Compendex, INSPEC, Metadex, DIALNET, Civil Engineering Abstracts
- Sayfa Sayıları: ss.1-13
- Süleyman Demirel Üniversitesi Adresli: Evet
Özet
In this paper, the output performance of a three-layer rectangular-shaped thermoelectric generator (TEG) designed for exhaust waste heat recovery of a spark-ignition engine is investigated under stationary operating conditions and compared with the use of engine coolant in the cold-side heat exchangers (CS_hex). The temperatures of the TEM surface, voltage-current characteristics, power output, efficiency, and recovered fuel energy are evaluated at various engine speeds. Using lower-temperature tap water (TW) instead of engine coolant in CS_hex increases the temperature difference across the TEG, enhancing both power output and energy recovery. The results show that under TW conditions, the TEG produces between 22.75 and 137.79 W of electrical power, with efficiency ranging from 1.45 % to 1.97 %, and recovered fuel energy rate between 0.175 % and 0.375 %, depending on engine speed. When engine coolant is used, the maximum TEG power at 4500 rpm is 81 W and the recovered fuel energy rate is 0.275 %, which are 54 W and 0.1 % lower, respectively, compared to TW conditions. An approximately 70 % increase in TEG power is achieved using TW in CS_hex under stationary engine operation.