碟式集热器驱动斯特林热机系统(火用)效率分析  

EXERGY EFFICIENCY ANALYSIS OF STIRLING HEAT ENGINE DRIVEN BY SOLAR DISH COLLECTOR BASED ON FTT

作　　者：李亚奇[1] 何雅玲[1] 王巍巍[1] 

机构地区：[1]西安交通大学能源与动力工程学院,动力工程多相流国家重点实验室,陕西西安710049

出　　处：《工程热物理学报》2009年第6期911-914,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学重点基金项目(No.50736005);国家重点基础研究发展计划项目(973项目)(No.2007CB206902)

摘　　要：本文用有限时间热力学方法分析了碟式太阳能集热器驱动内可逆斯特林热机系统的(火用)效率与吸收器工作温度、聚光比和回热时间系数之间的优化关系。研究结果表明:碟式系统的(火用)效率随聚光比和吸收器工作温度的增加先增加后减小,随回热时间系数的增加而减小;碟式系统较为合适的聚光比范围为600～1000,所对应的吸收器工作温度为1000 K～1600 K,当聚光比在850左右时,系统的(火用)效率达到最大值,约为0.54,此时吸收器的最佳工作温度为1200 K左右。这为碟式系统的优化设计与节能运行提供了理论指导。Exergy efficiency analysis of endoreversible stirling heat engine driven by parabolic dish collector was studied by finite time thermodynamics. The results indicate that exergy efficiency of dish system increases at beginning and decreases afterward with increasing of the collector temperature and concentrating ratio, decreases with increasing of regenerative time coefficient. It is also found that optimal range of collector temperature and corresponding concentrating ratio are 1000 K-1600 K and 600-1000, respectively. Maximum exergy efficiency of dish system can reach 0.54 when operating temperature and concentrating ratio are 1200 K and 850, respectively. The results can provide guidance for designing collector and operating Stirling heat engine.

关 键 词：有限时间热力学 太阳能热发电 斯特林热机 [火用]效率 

分 类 号：TK124[动力工程及工程热物理—工程热物理]