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 应用科技  2018, Vol. 45 Issue (6): 97-102  DOI: 10.11991/yykj.201806014 0

引用本文

GENG Guangxu, YAN Suying, WANG Feng, et al. Study of flux density distribution on focal plane of the trough solar concentrator system[J]. Applied Science and Technology, 2018, 45(6), 97-102. DOI: 10.11991/yykj.201806014.

文章历史

1. 内蒙古工业大学能源与动力工程学院，内蒙古 呼和浩特 010051;
2. 风能太阳能利用技术省部共建教育部重点实验室，内蒙古 呼和浩特 010051;
3. 山东德州皇明太阳能股份有限公司，山东德州 253000

Study of flux density distribution on focal plane of the trough solar concentrator system
GENG Guangxu1, YAN Suying1,2, WANG Feng1,2, LIU Haibo3, HAN Xiaofei3, TIAN Rui1,2
1. School of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;
2. Key Laboratory of Wind Energy Solar Energy Utilization Technology, Ministry of Education, Hohhot 010051, China;
3. Himin Solar Co., Ltd., Dezhou 253000, China
Abstract: This paper analyzes the influencing factors of energy flow distribution of the trough concentrator collector system in Hohhot, and that of flux density distribution of the heat absorbing pipe wall by the dimensionality reduction calculation method. A focal plane’s energy flow density distribution measuring device was built for trough solar collectors to measure the energy flow density distribution in the focal region of the collector. The results showed that various solar incident angles θ corresponded to different flux density distribution and peak value of the heat absorbing pipe wall. With the increase of system tracking deviation, the flux density distribution of wall appeared a tendency of dislocated distribution; the grey-scale map and rainbow graph of the flux density distribution in heat collecting pipe were obtained from the measurement experiments, then on the basis of this, we analyzed the influence of the focal plane’s energy flow density distribution law and various deviation factors of the system, as well as the main measurement uncertainty of this flux density distribution measurement, deriving that the relative standard uncertainty of the system was 5.39%.
Keywords: trough concentrator system    flux density    grey-scale map    rainbow graph    uncertainty    incident angle    system tracking    position deviation

1 能流密度计算 1.1 计算方法

1.2 太阳入射角θ

1.3 偏差距离（exey

1.4 跟踪偏差

2 焦面能流密度测试 2.1 测试装置

2.2 焦面区域灰度和能流密度分布

2.3 试验测试的不确定度分析

 $U_C = \sqrt {{U{_1}^2} + {U{_2}^2} + {U{_3}^2} + {U{_4}^2}}$

 $L_B{\rm{ = }}\left( {1 - \frac{{E\left( i \right)}}{{E_0}}} \right) \times 100{\rm{\% }}$ (1)

3 结论

1）不同太阳入射角θ所对应的吸热管壁面能流密度分布及峰值大小均不同，当θ在[0°, 75°]变化时，吸热管壁面能流密度分布变化幅度逐渐增大，壁面能流密度峰值从58.57 kW/m2减少至9.45 kW/m2，主要是由于不同θ下所对应系统末端损失大小不同。

2）随ex的增大，壁面能流密度峰值增大，同时引起热损失增大；随ey沿正方向数值的增大，壁面能流密度峰值增大且分布趋势陡峭。