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利用聚光太阳能吸热管的物理模型和方程式,分析聚光吸热管的吸热传热性能并优化系统效率。随着聚光热流密度的提高,聚光吸热管吸热效率先增加后减少,而增加流速可以降低管壁温度并提高吸热效率,增大管径则提高管壁温度并降低吸热效率。沿着流动方向,主流温度、工作流体内能流量与流量线性升高,而效率则先增加后降低。进口温度升高时,红外辐射热损失增加,吸热管吸热效率降低,而流体内能效率则显著提高,因此聚光吸热管整体效率先增加后降低,在进口温度为优化温度时达到最大值。
Using the physical model and the equation of the condenser solar heat absorption tube, the endothermic heat transfer performance of the condenser heat absorption tube is analyzed and the efficiency of the system is optimized. With the increase of the concentration heat flux, the heat absorption efficiency of the condenser tube increases firstly and then decreases, while increasing the flow velocity can decrease the tube wall temperature and increase the heat absorption efficiency. Increasing the tube diameter increases the tube wall temperature and reduces the heat absorption efficiency . Along the direction of flow, the main temperature, the flow of energy within the working fluid and the flow rate increased linearly, while the efficiency first increased and then decreased. When the inlet temperature increases, the heat loss of infrared radiation increases, the heat absorption efficiency of the heat absorption tube decreases, while the efficiency of the fluid increases significantly. Therefore, the overall efficiency of the condenser heat absorption tube increases first and then decreases. When the inlet temperature is the optimal temperature When reached the maximum.