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建立了由太阳能集热器模型和不可逆中冷回热布雷顿循环模型组成的恒温热源条件下太阳能布雷顿循环系统,以系统总效率为目标函数,考虑了高低温侧换热器、回热器和中冷器的热阻损失以及压缩机和涡轮机的不可逆损失,借助数值计算对太阳能集热器的工作温度进行了优化,并分析了主要特征参数对总效率的影响.结果表明:太阳能布雷顿循环系统中存在一个最佳的太阳能集热器工作温度和相应的最大总效率及最大总输出功率;在此基础上,通过优化中间压比可使循环系统的总效率和相应的总输出功率达到双重最大值;系统总效率随着回热器传热有效度和光学效率的增加而提高;系统运行时存在一个最佳的总压比.
The solar Brayton cycle system is established under the condition of constant temperature and heat source consisting of a solar collector model and an irreversible intercooled Brayton cycle model. Taking the total system efficiency as the objective function, the high and low temperature side heat exchangers and regenerators And the loss of thermal resistance of the intercooler and the irreversible loss of the compressor and the turbine, the operating temperature of the solar collector is optimized by means of numerical calculation and the influence of the main characteristic parameters on the total efficiency is analyzed. The results show that the solar Breton There is an optimal solar collector operating temperature and corresponding maximum total efficiency and maximum total output power in the circulation system. Based on this, the total efficiency of the circulation system and the corresponding total output power can be achieved by optimizing the intermediate pressure ratio Double maximum; the total system efficiency increases with the heat transfer efficiency and optical efficiency of the regenerator; there is an optimum total pressure ratio when the system is running.