In order to employ the waste heat effectively,a novel three-stage integrated system based upon a solid oxide fuel cell(SOFC),an alkali metal thermoelectric converter(AMTEC)and thermally regenerative electrochemical cy...In order to employ the waste heat effectively,a novel three-stage integrated system based upon a solid oxide fuel cell(SOFC),an alkali metal thermoelectric converter(AMTEC)and thermally regenerative electrochemical cycles(TRECs)is put forward.Considering the main electrochemically and thermodynamically irreversible losses,the power output and the efficiency of the subsystems and the integrated system are compared,and optimally operating regions for the current density,the power output,and the efficiency of the integrated system are explored.Calculations demonstrate that the maximum power density of the considered system is up to 7466 W/m2,which allows 18%and 74%higher than that of the conventional SOFC-AMTEC device and the stand-alone fuel cell model,respectively.It is proved that the considered system is an efficient approach to boost energy efficiency.Moreover,the influence of several significant parameters on the comprehensive performance of the integrated system is expounded in detail,including the electrolyte thickness of the SOFC,the leakage resistance of the SOFC,and the area ratio between the SOFC electrode and the AMTEC subsystem.展开更多
对基于AMTEC(Alkali Metal Thermal-to-Electric Converter,碱金属热电转换器)的毛细多孔吸液芯建立轴对称恒温相变模型,通过求解多孔芯区及液体通道区热质传输控制方程得到毛细多孔芯中的流动与传热特性,分析了工质流量、入口温度、多...对基于AMTEC(Alkali Metal Thermal-to-Electric Converter,碱金属热电转换器)的毛细多孔吸液芯建立轴对称恒温相变模型,通过求解多孔芯区及液体通道区热质传输控制方程得到毛细多孔芯中的流动与传热特性,分析了工质流量、入口温度、多孔芯厚度、孔隙率和有效孔径等参数对压力、速度和温度分布的影响;同时通过分析最大毛细力与回路压降之间的关系,给出了多孔芯有效孔径的适用范围和提高多孔芯性能的改进措施。研究结果表明:与三维两相流蒸发模型比较,文中的模型具有较好的预测准确性;以碱金属为工质的毛细多孔吸液芯和液体通道内的流动与传热特性与传统工质存在不同。展开更多
文摘In order to employ the waste heat effectively,a novel three-stage integrated system based upon a solid oxide fuel cell(SOFC),an alkali metal thermoelectric converter(AMTEC)and thermally regenerative electrochemical cycles(TRECs)is put forward.Considering the main electrochemically and thermodynamically irreversible losses,the power output and the efficiency of the subsystems and the integrated system are compared,and optimally operating regions for the current density,the power output,and the efficiency of the integrated system are explored.Calculations demonstrate that the maximum power density of the considered system is up to 7466 W/m2,which allows 18%and 74%higher than that of the conventional SOFC-AMTEC device and the stand-alone fuel cell model,respectively.It is proved that the considered system is an efficient approach to boost energy efficiency.Moreover,the influence of several significant parameters on the comprehensive performance of the integrated system is expounded in detail,including the electrolyte thickness of the SOFC,the leakage resistance of the SOFC,and the area ratio between the SOFC electrode and the AMTEC subsystem.
文摘对基于AMTEC(Alkali Metal Thermal-to-Electric Converter,碱金属热电转换器)的毛细多孔吸液芯建立轴对称恒温相变模型,通过求解多孔芯区及液体通道区热质传输控制方程得到毛细多孔芯中的流动与传热特性,分析了工质流量、入口温度、多孔芯厚度、孔隙率和有效孔径等参数对压力、速度和温度分布的影响;同时通过分析最大毛细力与回路压降之间的关系,给出了多孔芯有效孔径的适用范围和提高多孔芯性能的改进措施。研究结果表明:与三维两相流蒸发模型比较,文中的模型具有较好的预测准确性;以碱金属为工质的毛细多孔吸液芯和液体通道内的流动与传热特性与传统工质存在不同。
