论文部分内容阅读
建立了内插管式真空管空气集热器管内空气流动与换热的三维瞬态模型,该模型能够反映真空管吸热层表面辐射热流随时间和各微元位置不同而变化的特点。对不同工况下集热器的主要性能参数及内插管与真空管吸热体表面的温度分布进行预测。同时对横双排内插管式真空管空气集热器进行实验研究,理论和实验相结合,分析了不同工况下集热器的集热温度、瞬时集热效率、热损系数等性能参数,该集热器春夏季在30～80℃的集热温度范围内,集热效率在50%～70%之间,热损系数集中在2～6W/(m~2·K)的范围内。
A three-dimensional transient model of air flow and heat transfer in the tube was established. The model can reflect the characteristics of radiant heat flux on the surface of vacuum tube with time and different micro-elements. The main performance parameters of the collector under different operating conditions and the temperature distribution of the surface of the heat absorption tube between the inner tube and the vacuum tube are predicted. At the same time, horizontal double-row intubation tube vacuum tube air-collectors were studied experimentally, and theoretical and experimental data were combined to analyze the performance parameters of collectors under different operating conditions, such as collector temperature, instantaneous collector efficiency and heat loss coefficient The collector efficiency is between 50% and 70% in the collector temperature range of 30 ~ 80 ℃ in spring and summer, and the heat loss coefficient is concentrated in the range of 2 ~ 6W / (m ~ 2 · K).