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首页> 外文期刊>Energy Conversion & Management >Optimum tilt angle for flat plate collectors all over the World - A declination dependence formula and comparisons of three solar radiation models
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Optimum tilt angle for flat plate collectors all over the World - A declination dependence formula and comparisons of three solar radiation models

机译：全世界平板集热器的最佳倾斜角-磁偏角公式和三种太阳辐射模型的比较

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摘要

The paper presents a theoretical study on the optimum tilt angle for flat plate collectors at different geographical locations and different time moments over a year. The solar radiation density is estimated based on three analysis models, namely Hottel and Woertz model (the simplest), Isotropic diffuse model (Liu & Jordan model) and HDKR model (Hay-Davis-Klucker-Reindl), passing from the simplest to the most complex one. Further, the absorbed solar radiation density is computed and the optimum tilt angle is found for different geographical locations (covering the Globe latitudes). The optimum value for the tilt angle is researched for maximum incident solar radiation and also for maximum absorbed one. The results indicate that the same angle is obtained when looking for maximum incident and for maximum absorbed solar radiation. When comparing the three above mentioned models, different tilt angles are supplied by applying the Hottel and Woertz model and respectively the others two (both of them providing the same angle). Although, the predicted absorbed solar radiation is the same in the summertime for all three models, and probably overestimated by the last model in the springtime. The obtained results give an overview over the whole year operation at different geographical latitudes. When using the Hottel & Woertz model for estimating the incident solar radiation, the optimum tilt angle for a flat plate collector should be computed as simplest as β_(opt) =φ - δ function on the latitude and declination. If a fixed value is easier to be used over a specific operation period, an optimum value is provided by this research. The novelty consists in finding this global optimum instead of "local" ones for which monthly adjustment is required. The results are compared to the approximation given in the technical literature according to which the optimum tilt angle should be local latitude plus or minus (for winter or summer seasons, respectively) 10° or 15° (with small variations as it is further presented).
机译：本文提出了关于平板收集器在一年中不同地理位置和不同时刻的最佳倾斜角的理论研究。太阳辐射密度是根据以下三种分析模型估算的，从最简单的模型到模型，即Hottel和Woertz模型（最简单），各向同性扩散模型（Liu＆Jordan模型）和HDKR模型（Hay-Davis-Klucker-Reindl）。最复杂的一个。此外，计算吸收的太阳辐射密度，并找到不同地理位置（覆盖地球仪纬度）的最佳倾斜角。对于最大入射太阳辐射以及最大吸收太阳辐射，研究了倾斜角的最佳值。结果表明，当寻找最大入射角和最大吸收太阳辐射时，可获得相同的角度。当比较上述三个模型时，通过应用Hottel和Woertz模型分别提供不同的倾斜角，其他两个分别提供（两个都提供相同的角度）。虽然，三个模型在夏季的预测吸收太阳辐射都是相同的，并且在春季可能会被最后一个模型高估。所获得的结果概述了在不同地理纬度下全年的运行情况。当使用Hottel＆Woertz模型估算入射的太阳辐射时，平板集热器的最佳倾斜角应计算为最简单的纬度和纬度β_（opt）=φ-δ函数。如果在特定的操作周期内更易于使用固定值，则本研究提供了最佳值。新颖之处在于找到了全局最优值，而不是需要每月进行调整的“局部”最优值。将结果与技术文献中给出的近似值进行比较，根据该近似值，最佳倾斜角应为本地纬度的正负（分别针对冬季或夏季）为10°或15°（进一步出现较小的变化） 。

著录项

  • 来源
    《Energy Conversion & Management》 |2014年第5期|133-143|共11页
  • 作者

    Camelia Stanciu; Dorin Stanciu;

  • 作者单位

    University Politehnica of Bucharest, Faculty of Mechanical Engineering and Mecatronics, Engineering Thermodynamics Department, Splaiul Independentei, 313, sector 6, 060042 Bucharest, Romania;

    University Politehnica of Bucharest, Faculty of Mechanical Engineering and Mecatronics, Engineering Thermodynamics Department, Splaiul Independentei, 313, sector 6, 060042 Bucharest, Romania;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Solar radiation; Flat plate collectors; Optimum tilt angle; Absorbed radiation;

    机译：太阳辐射;平板集热器;最佳倾斜角度;吸收辐射;

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