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以应用热力学理论和方法建立的由太阳集热器和不可逆中冷回热再热布雷顿循环模型组成的恒温条件下太阳能布雷顿热机系统为研究对象,以系统总效率为目标函数,分析并计算太阳辐射强度和聚光比、高低温换热器有效度、压缩机和透平效率、中间压比和总压比对系统总效率的影响。结果表明,系统存在一个最佳的太阳集热器工作温度和相应的最大系统总效率;当太阳集热器效率保持一定时,系统总效率随太阳辐照强度和聚光比的提高而升高;相同工作温度下,提高低温侧换热器有效度压缩机效率对系统总效率的提高收益更大。通过优化中间压比可使系统总效率达到最大,系统运行时存在一个最佳总压比。
Based on the application of thermodynamic theory and method, the solar Breton heat engine system consisting of a solar collector and an irreversible intercooled reheating Brayton cycle model under constant temperature is taken as the research object, and the total system efficiency is taken as the objective function to analyze and calculate Solar radiation intensity and concentration ratio, the effectiveness of high and low temperature heat exchangers, compressor and turbine efficiency, intermediate pressure ratio and the total pressure ratio of the total system efficiency. The results show that the system has an optimal operating temperature of solar collector and the corresponding maximum total system efficiency. When the efficiency of solar collector remains constant, the total system efficiency increases with the increase of solar irradiation intensity and concentration ratio ; The same operating temperature, improve the effectiveness of the low temperature side of the heat exchanger efficiency of the compressor to improve the overall efficiency of the system more revenue. By optimizing the intermediate pressure ratio, the total efficiency of the system can be maximized. There is an optimal total pressure ratio when the system is operating.