고온 고분자연료전지와 유기랜킨사이클 복합발전시스템 이론적 해석
Analysis of a High Temperature Polymer Electrolyte Fuel Cell Combined with an Organic Rankine Cycle System
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Model equations of a combined system with a high temperature polymer electrolyte fuel cell (HT-PEFC) system based on phosphoric acid (PA)-doped polybenzimidazole(PBI) membranes and a heat recovery power system were derived. In this study, an organic Rankine cycle system (ORCS) was proposed as a bottoming cycle system to convert the waste heat from a fuel cell stack to electric power. To optimize the combined system, the efficiency at the maximum power of the heat recovery system was derived. To calculate the ORCS performance analytically, a modified Carnot cycle coupled to heating and cooling fluids with a finite heat capacity rate was considered using the entropic average temperature. This simple equation does not require any detailed thermodynamic data of organic working fluids. By combining the ORCS with the HT-PEFC system, the electric power was improved by 6% to 8% according to the load conditions. As the fuel cell load is increased, the efficiency of the fuel cell is decreased, but the contribution of the heat recovery power system to the total combined system efficiency was increased due to the increased waste heat produced in the stack. The methods proposed in this paper can provide a useful measurement of the performance available in practical fuel cell-based hybrid power systems without complex numerical calculations.
Abstract
Model equations of a combined system with a high temperature polymer electrolyte fuel cell (HT-PEFC) system based on phosphoric acid (PA)-doped polybenzimidazole(PBI) membranes and a heat recovery power system were derived. In this study, an organic Rankine cycle system (ORCS) was proposed as a bottoming cycle system to convert the waste heat from a fuel cell stack to electric power. To optimize the combined system, the efficiency at the maximum power of the heat recovery system was derived. To calculate the ORCS performance analytically, a modified Carnot cycle coupled to heating and cooling fluids with a finite heat capacity rate was considered using the entropic average temperature. This simple equation does not require any detailed thermodynamic data of organic working fluids. By combining the ORCS with the HT-PEFC system, the electric power was improved by 6% to 8% according to the load conditions. As the fuel cell load is increased, the efficiency of the fuel cell is decreased, but the contribution of the heat recovery power system to the total combined system efficiency was increased due to the increased waste heat produced in the stack. The methods proposed in this paper can provide a useful measurement of the performance available in practical fuel cell-based hybrid power systems without complex numerical calculations.
참고문헌 (26)
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