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通过分析真空管集热器传热的数学模型,介绍了容积式集热器的传热特点。并且结合实验测试数据,对集热器内液体温度对集热效率的影响进行了分析。结果显示:实验温度范围内集热器的集热效率分为三个阶段,当集热器的温度由38.1℃升高到45.2℃时,集热器的效率下降明显;当集热器的温度由45.2℃升高到57.1℃时,集热器的效率变化不大,基本稳定;当集热器的温度大于62.8℃时,集热器效率又开始呈现明显的下降趋势。通过对数据进行四阶多项式拟合,最后得出了集热效率与集热器温度之间的数学关系。
By analyzing the mathematical model of heat transfer in vacuum tube collector, the heat transfer characteristics of volumetric collector are introduced. Combined with the experimental data, the influence of the liquid temperature on the heat collecting efficiency in the collector was analyzed. The results show that the collector efficiency of the collector is divided into three stages within the experimental temperature range. When the temperature of the collector rises from 38.1 ℃ to 45.2 ℃, the efficiency of the collector decreases obviously. When the temperature of the collector is increased from When the temperature rises from 45.2 ℃ to 57.1 ℃, the efficiency of the collector does not change much and is basically stable. When the temperature of the collector is more than 62.8 ℃, the efficiency of the collector begins to decline obviously. By fitting the data to the fourth-order polynomial, the mathematical relationship between heat-collection efficiency and collector temperature is finally obtained.