Details

Autor(en) / Beteiligte

• Sahoo, Rashmi Rekha
• Karana, Dhruv Raj

Titel

Effect of design shape factor on exergonic performance of a new modified extended-tapering segmented thermoelectric generator system

Ist Teil von

• Energy (Oxford), 2020-06, Vol.200, p.117561, Article 117561

Ort / Verlag

Oxford: Elsevier Ltd

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The present theoretical analysis focused on the investigation of a new design extended and tapering segmented pin configuration based thermoelectric generator (TEG) incorporating with modified bismuth and lead telluride materials. With the current design, the system can operate at two different cold junctions. Effect of thermal performance, i.e., heat transfer rate from the cold and hot side, maximum efficiency, overall efficiency, second law efficiency, entropy generation, normalized work and efficiency ratios on the variation of designed shape factor, load resistance ratio, temperature ratio, and p-n junction lower temperature difference have been considered. Results revealed that variation in designed shape factor has a significant influence on overall efficiency for temperature ratios, and nearly a 13.83% decrease in overall efficiencies is observed for the variation in shape factor ξ, −0.38 to 0.5. The temperature ratio significantly affects the length ratio of the segmented pin. The exergy efficiency of 16% and the maximum efficiency of 22% is observed, which may be due to the thermodynamic irreversibility linked between the heat transfer systems. The entropy of generation has minimal effect for the load resistance variation with a figure of merit 2.5, and the maximum efficiency is observed at a higher load resistance ratio value of RL/RO = 3.1, compared to the output work ratio. This implies that for the new modified design TEG, the maximum output work is not obtained at the point of maximum efficiency. Thus, the present modified design TEG provides a higher power output than traditional designs incorporating identical pins. •Different materials based modified extended-tapering segmented pin configuration.•TEG is investigated.•The thermodynamic irreversibility of modified TEG revealed less exergy efficiency than maximum efficiency.•The cold junctions of TEG are employed with two different temperatures for thermal performance enhancement.•The pin length ratio highly influenced by designed shape factor and temperature ratio for maximum efficiency.•Modified designed TEG does not provide the maximum output work when operated at maximum efficiency. .