不可逆中冷回热再热太阳能布雷顿热机系统的㶲分析  

Exergy analysis of solar-driven irreversible intercooled iegenerated ieheated Brayton cycle

作　　者：盖双旗[1,2] 韦雪娇[2] 

机构地区：[1]桂林理工大学环境科学与工程学院，广西 桂林 541004 [2]梧州学院信息与电子工程学院

出　　处：《中国科技论文》2015年第11期1323-1328,共6页China Sciencepaper

基　　金：广西自然科学基金资助项目(2012GXNSFBA053015);梧州学院2014年科研基金资助项目

摘　　要：运用热力学第二定律,分析了恒温条件下,不可逆中冷回热再热太阳能布雷顿热机系统的损失和效率。结果表明:系统的效率随聚光比、高/低温侧换热器有效度的提高而增加;相同工作温度下,提高低温侧换热器有效度对系统效率的提高收益更大。在给定低压压缩机压比和高压透平膨胀比时,随着回热器有效度的增大,系统最大效率增加,最佳总压比减小;随着高/低温侧换热器有效度的增大,系统最大效率增加,最佳总压比增大。在给定总压比时,随着回热器、高低温侧换热器有效度的增加,系统最大效率增加,最佳低压压缩机压比和最佳高压透平膨胀比增大。这为系统的优化设计与节能运行提供了理论指导。An exergy analysis has been carried out for solar-driven irreversible intercooled regenerated reheated Brayton heat en- gine system under constant temperature based on second law of thermodynamics. Analysis shows that exergy efficiency of the system will increase with concentrated ratio and high/low temperature side heat exchanger efficiency improvement. Improving the low temperature side heat exchanger efficiency at the same working temperature raises more profits for exergy efficiency of the system. Given the low pressure compressor pressure ratio and the high pressure turbine expansion ratio, the biggest exergy effi- ciency of the system increases and the best total pressure ratio decreases with the increase of regenerator effectiveness; Along with the rising of the high/low temperature side heat exchanger efficiency, the biggest exergy efficiency of the system increases, and the best total pressure ratio of the system increases. Given a total pressure ratio, as the regenerator and the high/low temper- ature side heat exchanger increase, the biggest exergy efficiency of the system increases, the best low pressure compressor pres- sure ratio and the optimum high pressure turbine expansion ratio increase. This provides theoretical guidance for the optimal de- sign and energy saving operation of the system.

关 键 词：太阳能热机 布雷顿循环 㶲损失 㶲效率 

分 类 号：TK513[动力工程及工程热物理—热能工程]