Chart for Thermoelectric Systems Operation Based on a Ternary Diagram for Bithermal Systems

Area of Science:

• Physics
• Materials Science
• Thermodynamics

Background:

• Thermoelectric systems require careful operation for optimal power conversion.
• Bithermal systems analysis using ternary diagrams provides insights into work-heat conversion.
• The standard model of Ioffe is foundational for thermoelectric analysis.

Purpose of the Study:

• To graphically and analytically characterize thermoelectric system operation modes.
• To determine optimal efficiencies and powers for heat pump and heat engine modes.
• To analyze the impact of operating conditions and material properties on performance aims.

Main Methods:

• Plotting thermoelectric system operation as a parametric curve based on the Ioffe model.
• Graphical and analytical characterization of operating modes, efficiencies, and powers.
• Entropy generation analysis to discuss semiconductor phenomena (Seebeck effect, heat leakage, Joule effect).

Main Results:

• Defined thresholds for heat engine, heat pump, thermal dissipation, and forced thermal transfer modes.
• Quantified optimal efficiencies and powers for heat pump and heat engine modes.
• Highlighted the sensitivity of performance aims (max efficiency vs. max power) to operating conditions.

Conclusions:

• The study provides a comprehensive analysis of thermoelectric system performance under various conditions.
• Understanding entropy generation and external resistances is crucial for optimizing thermoelectric devices.
• The findings offer insights for tailoring thermoelectric system operation to specific application requirements.