不可逆中冷回热再热太阳能布雷顿热机系统的热力学分析  

THERMODYNAMIC ANALYSIS OF SOLAR-DRIVEN IRREVERSIBLE INTERCOOLED REGENERATED REHEATED BRAYTON CYCLE SYSTEM

作　　者：盖双旗[1] 

机构地区：[1]广西梧州学院数理系,梧州543002

出　　处：《太阳能学报》2014年第12期2497-2503,共7页Acta Energiae Solaris Sinica

基　　金：广西自然科学基金(2012GXNSFBA053015);梧州学院科研项目(2010C005)

摘　　要：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。Using an irreversible solar-driven Brayton heat engine system under constant temperature as study object, which consisted of a solar collector and the model of an intercooled regenerated reheated Brayton cycle system according to thermodynamic theory and method. Taking the overall efficiency of the system as the objective function, the effect of solar radiation intensity and concentration ratio, high and low temperature heat exchanger effectiveness, compressor and turbine efficiency, intermediate and total pressure ratio on total system efficiency was analyzed and calculated. The results show that there are optimum operating temperature of solar collector and corresponding maximum overall efficiency for the system. When the solar collector efficiency is constant, the total efficiency of the system increases with increase of solar radiation intensity and concentration ratio. Under the same working temperature, improving the heat exchanger in low temperature side will increase total system efficiency more, and improving the efficiency of the compressor can improve the total efficiency of the system more. The overall efficiency may reach their maximum value by optimizing the intermediate pressure ratio, there exists an optimum total pressure ratio for the system operation.

关 键 词：太阳能热机 布雷顿循环系统 最佳工作温度 最佳压比 总效率 

分 类 号：TK123[动力工程及工程热物理—工程热物理]