Abstract
Performance of a high-temperature proton exchange membrane fuel cell (HT-PEMFC) and the influence of different parameters on HT-PEMFC is analyzed in this study. Firstly, mathematical expression for energy efficiency, power density, exergy destruction and exergetic performance coefficient (EPC) are derived. Then, the relationship between the dimensionless power density, exergy destruction rate, exergetic performance coefficient (EPC) and energy efficiency is compared. Furthermore, the effect of flow rate, doping level, inlet pressure and film thickness are considered to evaluate the performance of HT-PEMFC. Results show that EPC not only considers exergetic loss rate to minimize exergetic loss, but also considers the power density of HT-PEMFC to maximize its power density and improve its efficiency, so EPC represents a better performance criterion. In addition, increasing inlet pressure and doping level can improve EPC and energy efficiency, respectively.
Highlights
Coefficient Analysis and OptimizationAmong fuel cell types, the proton exchange membrane fuel cell (PEMFC) has been widely used in mobile units and automobiles
Ye et al [23] analyzed the performance of an HT-PEMFC under different operating conditions by exergy analysis, and the results showed that higher operating temperature was beneficial to improve the efficiency and power of the system, but relative humidity and operating pressure had little influence on the system
The purpose of this study is to evaluate HT-PEMFC by exergetic performance coefestablished which takes three kinds of polarization losses and leakage current density ficient (EPC) and compare it with other Finite time thermodynamics (FTT) indexes
Summary
The proton exchange membrane fuel cell (PEMFC) has been widely used in mobile units and automobiles. A low-temperature proton exchange membrane fuel cell (LT-PEMFC) operates at around 80 ◦ C and is used in fuel cell vehicles. Compared with LT-PEMFC, an HT-PEMFC operates at 120–200 ◦ C and has a lot of advantages, such as higher CO tolerance [1,2], simplified water and heat management [3] and enhanced kinetics [4]. Many studies [5–10] have been devoted to the HT-PEMFC. Finite time thermodynamics (FTT) has been used to analyze various thermodynamic processes and cycles [11–21] for several decades. The electrochemical model of PEMFC can be embodied into corresponding FTT model for thermodynamic performance analysis and optimization to pursue maximum performances under operation conditions
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