内插式真空管集热器集热性能提升技术研究综述

Research Review on Thermal Performance Improvement Technology of the Evacuated Tube Collector with Insert Tubes

真空管太阳能集热器是太阳能热利用的重要途径。内插式真空管集热器是一种结构优化后的真空管集热器,为提升其集热性能,介绍了内插式真空管集热器的工作原理,对其传热机理进行了分析,归纳了当前对内插式真空管集热器的集热性能的研究现状,并在此基础上通过建立集热效率关于环境参数及流量的关联式、改进内插管主管和支管管径尺寸、综合优化集热器布置方式及管间距并设置反射板的方式等方法分析了存在的问题,为低成本、高效率的内插式真空管集热器的研究发展提供了参考依据。

Evacuated tube solar collectors are an important way of solar energy utilization.The evacuated tube collector with inserted tubes is a structurally optimized vacuum tube collector,and scholars at home and abroad have conducted extensive research on the improvement of their thermal performance.In this article,the working principle of the evacuated tube collector with inserted tubes is introduced and the heat transfer mechanism is analyzed.The current research status on the thermal performance of the evacuated tube collector with inserted tubes is summarized.Based on this,it is proposed to establish a correlation between heat collection efficiency and environmental parameters and flow rate to obtain the optimal flow rate,to reduce operating costs.Adjust the diameter size of the main and branch pipes of the inserted tubes,and improve the uniformity of fluid distribution in parallel pipelines.By comprehensively optimizing the layout of the collector and the spacing between pipes,as well as setting up reflective plates,the efficiency of the collector is fully improved,thereby enhancing the collector's heat collection capacity.This provides a reference basis for the research and development of low-cost and high-efficiency evacuated tube collector with insert tubes.