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中文摘要：
运用Fluent软件中的太阳加载模型,以新型CPC内聚光式集热器为研究对象,通过理论分析和数值模拟相结合的方法研究了环形空间真空层的传热特性,分析了不同环形空间压力和不同气体介质下CPC内聚光式集热器温度场的分布以及热损失特性。模拟结果表明,在太阳辐照度一定的情况下,环形空间压力越大,集热器热损失也就越大,当环形空间压力下降到1 Pa时,环形空间的热损失基本不再受环形空间压力的影响。研究结果可揭示环形空间内部的传热机理,确定CPC内聚光式集热器内合理的真空压力,为CPC内聚光式集热器结构参数的优化以及集热效率的提高提供可行性依据。
英文摘要：
This paper applied solar load model of Fluent software, regarding the new CPC concentrating solar collector model as the research object. By using theortical and numerical simulation method, the heat transfer characteristics of the vacuum in annular space are studied.Meanwhile the temperature distribution of heat collector field and the traits of heat loss are analyzed under different vacuum pressures and gaseous mediums. The results are as follows. A strong positive correlation was observed between the pressure of the colllector annual space and the heat loss under certain solar irradiance. When the pressure drops below a certain value 1 Pa, the basic heat loss is no longer affected by the pressure. The study not only reveals the mechanism of heat transfer tubes but also determine a reasonable vacuum pressure. This would optimize the CPC structure parameters and improve the efficiency of concentrating collectors.
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