Organic Rankine cycle(ORC)is widely used for the low grade geothermal power generation.However,a large amount of irreversible loss results in poor technical and economic performance due to its poor matching between th...Organic Rankine cycle(ORC)is widely used for the low grade geothermal power generation.However,a large amount of irreversible loss results in poor technical and economic performance due to its poor matching between the heat source/sink and the working medium in the condenser and the evaporator.The condensing temperature,cooling water temperature difference and pinch point temperature difference are often fixed according to engineering experience.In order to optimize the ORC system comprehensively,the coupling effect of evaporation and condensation process was proposed in this paper.Based on the laws of thermodynamics,the energy analysis,exergy analysis and entropy analysis were adopted to investigate the ORC performance including net output power,thermal efficiency,exergy efficiency,thermal conductivity,irreversible loss,etc.,using geothermal water at a temperature of 120℃as the heat source and isobutane as the working fluid.The results show that there exists a pair of optimal evaporating temperature and condensing temperatures to maximize the system performance.The net power output and the system comprehensive performance achieve their highest values at the same evaporating temperature,but the system comprehensive performance corresponds to a lower condensing temperature than the net power output.展开更多
通过利用Solid Works三维建模及ANSYS Workbench三维仿真模拟软件,研究了铝电解槽在正常生产状态下,其有限元分析的几何切片模型以及相应的边界条件和数学模型。针对某电解铝厂的500 k A电解槽,通过计算确定了其复杂的边界条件,建立了...通过利用Solid Works三维建模及ANSYS Workbench三维仿真模拟软件,研究了铝电解槽在正常生产状态下,其有限元分析的几何切片模型以及相应的边界条件和数学模型。针对某电解铝厂的500 k A电解槽,通过计算确定了其复杂的边界条件,建立了较为全面的数学模型和精确的几何切片模型。以此作为前提条件,对该模型进行热电场计算分析。展开更多
基金Project(2018YFB1501805)supported by the National Key Research and Development Program of ChinaProject(51406130)supported by the National Natural Science Foundation of ChinaProject(201604-504)supported by the Key Laboratory of Efficient Utilization of Low and Medium Grade Energy(Tianjin University),China
文摘Organic Rankine cycle(ORC)is widely used for the low grade geothermal power generation.However,a large amount of irreversible loss results in poor technical and economic performance due to its poor matching between the heat source/sink and the working medium in the condenser and the evaporator.The condensing temperature,cooling water temperature difference and pinch point temperature difference are often fixed according to engineering experience.In order to optimize the ORC system comprehensively,the coupling effect of evaporation and condensation process was proposed in this paper.Based on the laws of thermodynamics,the energy analysis,exergy analysis and entropy analysis were adopted to investigate the ORC performance including net output power,thermal efficiency,exergy efficiency,thermal conductivity,irreversible loss,etc.,using geothermal water at a temperature of 120℃as the heat source and isobutane as the working fluid.The results show that there exists a pair of optimal evaporating temperature and condensing temperatures to maximize the system performance.The net power output and the system comprehensive performance achieve their highest values at the same evaporating temperature,but the system comprehensive performance corresponds to a lower condensing temperature than the net power output.
文摘通过利用Solid Works三维建模及ANSYS Workbench三维仿真模拟软件,研究了铝电解槽在正常生产状态下,其有限元分析的几何切片模型以及相应的边界条件和数学模型。针对某电解铝厂的500 k A电解槽,通过计算确定了其复杂的边界条件,建立了较为全面的数学模型和精确的几何切片模型。以此作为前提条件,对该模型进行热电场计算分析。
