Exergetic Performance Coefficient Analysis and Optimization of a High-Temperature Proton Exchange Membrane Fuel Cell

Area of Science:

• Energy Science
• Electrochemistry
• Thermodynamics

Background:

• High-temperature proton exchange membrane fuel cells (HT-PEMFCs) are critical for efficient energy conversion.
• Evaluating HT-PEMFC performance requires comprehensive metrics that balance energy efficiency and power output.

Purpose of the Study:

• To analyze the performance of HT-PEMFCs.
• To derive mathematical expressions for key performance indicators including energy efficiency, power density, exergy destruction, and the exergetic performance coefficient (EPC).
• To compare the relationships between these parameters and evaluate HT-PEMFC performance using EPC.

Main Methods:

• Derivation of mathematical expressions for energy efficiency, power density, exergy destruction, and EPC.
• Comparative analysis of dimensionless power density, exergy destruction rate, EPC, and energy efficiency.
• Evaluation of HT-PEMFC performance under varying flow rates, doping levels, inlet pressures, and film thicknesses.

Main Results:

• The exergetic performance coefficient (EPC) is identified as a superior performance criterion for HT-PEMFCs, as it accounts for both minimizing exergy loss and maximizing power density.
• Increasing inlet pressure positively influences EPC.
• Increasing doping level enhances energy efficiency.

Conclusions:

• EPC offers a more holistic assessment of HT-PEMFC performance compared to traditional metrics.
• Optimizing operating parameters like inlet pressure and doping level is crucial for enhancing HT-PEMFC efficiency and performance.