论文部分内容阅读
针对太阳能槽式聚光集热系统设计一种三角形腔体吸收器,对其热损失特性建立基于能量衡算和热网络方法的理论分析模型,并进行实验验证。考察腔体吸收器光口倾角、环境风速、保温层厚度、工质流速、工质与环境温差等对各分项热损失和总热损失的影响规律,通过敏感性分析近似拟合出4个二元影响因素对总热损的影响关联式。总热损随工质与环境温差、环境风速呈幂函数正增加趋势,影响较大;与保温层厚度呈对数反增加趋势;与过渡流范围的工质流速呈多项式变化,影响较小;随光口倾角的变化也不大。理论计算值与实测值吻合度高,理论分析模型较准确。结果表明腔体吸收器在无风环境下热损失大小与真空管集热器相当。
A triangular cavity absorber was designed for solar trough concentrating heat collecting system. The theoretical analysis model based on energy balance calculation and thermal network method was established for its heat loss characteristics and verified by experiments. The influences of the cavity inclination angle, the ambient wind speed, the thickness of the thermal insulation layer, the working fluid velocity, the temperature difference between the working fluid and the environment on the heat loss and the total heat loss of each sub-item were investigated. Sensitivity analysis fitted four Influence of Binary Influencing Factors on Total Heat Loss Correlation. The total heat loss with the temperature difference between the working fluid and the environment, the environmental wind speed showed a positive power function trend, a greater impact; and the thickness of the insulation layer showed a logarithmically increasing trend; and transitional flow range of the working fluid flow rate polynomial change, the impact is small; With the changes in the inclination of the light is not large. The theoretical calculated value is in good agreement with the measured value, and the theoretical analysis model is more accurate. The results show that the size of the cavity absorber in the absence of wind heat loss and vacuum tube collector size.