研究目的
To investigate the self-made model of a thermoelectric generator TEG constructed using Peltier modules, determine its electrical efficiency, identify a temperature range for practical waste heat recovery, and provide design guidelines to optimize efficiency.
研究成果
The self-made TEG model achieved an efficiency of 2.94% at a temperature difference of 99.1°C, with potential improvements to 4.08% with better cooling. Effective waste heat recovery requires high temperature gradients (above 80°C) and efficient cold-side cooling. Design guidelines emphasize minimizing thermal losses through good thermal contact and high-conductivity materials. The technology is applicable to high-temperature sources like fossil fuel-based systems, with potential hybrid uses in photovoltaic cooling to enhance energy yield.
研究不足
The study used a static water cooling system without forced flow, limiting the cooling efficiency. The model assumed negligible energy expenditure for cooling due to high water thermal capacity, which may not hold in dynamic conditions. Technological limitations of Peltier modules, such as Joule effect and heat conduction, reduce practical efficiency. The temperature range for effective recovery is high (above 80°C), which may not be feasible for all waste heat sources.
1：Experimental Design and Method Selection:
The study involved designing and building a thermoelectric generator (TEG) model using Peltier modules to convert waste heat into electrical energy. The methodology included measuring input and output powers, temperature gradients, and calculating efficiency based on the Seebeck effect and other physical phenomena.
2：Sample Selection and Data Sources:
The TEG model was self-made using two Peltier modules (TEC1-127105) with specific parameters. Temperature and electrical measurements were taken at various points in the system.
3：List of Experimental Equipment and Materials:
Equipment included Peltier modules, infrared heater, water cooling system, temperature sensors, multimeters for voltage and current measurement, and thermoconducting paste (AAB Cooling Thermal Grease 2). Materials included aluminum radiators, separators, and a water tank.
4：2). Materials included aluminum radiators, separators, and a water tank. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The setup involved heating the hot side with an infrared heater, cooling the cold side with a water tank, measuring temperatures at multiple points, and recording output voltage and current with a resistive load. Measurements were taken under steady-state conditions.
5：Data Analysis Methods:
Efficiency was calculated as the ratio of output electrical power to input thermal power. Input power was derived from heat energy delivered to the system, and output power was computed from voltage and current measurements. Statistical analysis included curve fitting to approximate efficiency as a function of temperature difference.
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