摘要
为了提高槽式空气集热器的集热性能,减小集热器集热管周向的热应力,文章提出一种新型双螺旋集热管双抛物面槽式空气集热器(简称螺旋集热器)方案,搭建了螺旋集热器与双管翅片形吸热器的双曲面槽式空气集热器(简称翅片集热器)的热性能对比试验台,结合日光温室集热的应用场景,试验分析了螺旋集热器的热性能,并与翅片集热器对比分析。试验结果表明:在集热器入口空气温度为13~16℃的条件下,螺旋集热器优化后的入口空气流速为5.7 m/s,其最大集热效率为78.3%;在集热器优化后空气流速下,螺旋集热器的平均集热效率为66.4%,螺旋集热器的平均瞬时集热量和平均集热效率比翅片集热器的分别提高了8.9%和5.6%;螺旋吸热器能够改善管壁周围温度分布,进而有效地减小了集热器集热管的热应力;螺旋与翅片集热器的最大火用效率分别为1.58%和1.51%。该研究可为双抛物面槽式空气集热器的设计与应用提供技术、方法参考。
To improve the thermal collection performance of the parabolic trough air collector,and reduce the thermal stress of the collector tube,a novel double-parabolic trough air collector with double-spiral heat receiver(referred to as spiral collector)was proposed,and a comparative test bench for the thermal performance of the spiral collector and a double-parabolic trough air collector with double-fin heat receiver(referred to as fin collector)was built.Then,the thermal performance of the spiral collector was analyzed in combination with the application scenario of solar greenhouse heat collector and compared with the fin collector.The experiment results showed that the optimal inlet air velocity of the spiral collector is 5.7 m/s under the condition that the inlet air temperature of the collector is 13~16℃,and its maximum heat collection efficiency was 78.3%.Under the optimal air velocity of the collector,the average heat collection efficiency of the spiral collector was 66.4%,and the average instantaneous heat collection and the average heat collection efficiency of the spiral collector were 8.9%and 5.6%higher than those of the fin collector,respectively.The spiral heat receiver can improve the temperature distribution around the tube wall,which effectively reduces the thermal stress of the collector tube.The maximum exergy efficiency of the spiral collector and fin collector were 1.58%and 1.51%,respectively.These findings can provide a technical reference for the design and application of double parabolic trough air collectors.
作者
胡万玲
张煦
管勇
叶文涛
马乔乔
Hu Wanling;Zhang Xu;Guan Yong;Ye Wentao;Ma Qiaoqiao(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Key Laboratory of Railway Vehicle Thermal Engineering(Lanzhou Jiaotong University),Ministry of Education of China,Lanzhou 730070,China)
出处
《可再生能源》
北大核心
2025年第6期746-754,共9页
Renewable Energy Resources
基金
国家自然科学基金项目(51868035,51866006)。
关键词
双抛物面槽式集热器
螺旋集热管
热性能
火用效率
试验研究
double-parabolic trough collector
spiral heat receiver
thermal performance
exergy efficiency
experimental research
