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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。
In this paper, the optimal relationship between the exergy efficiency and the working temperature of the absorber, the condenser ratio and the back-heat time coefficient driven by the dish-type solar collector is analyzed using finite-time thermodynamics method. The results show that the exergy efficiency of the disk system first increases and then decreases with the increase of the condenser ratio and the working temperature of the absorber, and decreases with the increase of the heat recovery time coefficient. The suitable concentrating ratio of the disk system The range of 600 ~ 1000, the corresponding absorber operating temperature 1000 K ~ 1600 K, when the concentration ratio is about 850, the system (exergy) efficiency reaches a maximum value of about 0.54, at this time the absorber Good working temperature is 1200 K or so. This provides the theoretical guidance for the optimal design and energy-saving operation of the disk system.