管式真空管太阳能集热器预测出水温度的热建模:实验验证

IF 2.1 4区 工程技术 Q3 ENERGY & FUELS
Pushpendra Singh, M. Gaur, G. Tiwari, Ashok Kumar
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引用次数: 0

摘要

建立了串联式真空管式太阳能集热器出水温度随时间变化的热模型。对单集热器和双集热器串联的数学表达式进行了验证。在每个收集器中,有20个真空管连接到储罐。计算了决定系数(R2)、χ2和均方根误差(RMSE)来显示所建立模型的预测精度。单采集器和双采集器串联时,R2分别为99.73%和99.90%,χ2分别为0.46°C和0.39°C, RMSE分别为0.70°C和0.65°C。预测值与实验值吻合较好。在恒定质量流量下,单集热器和双集热器串联的最高出口温度分别达到53.10°C和71.50°C。单集热器最大能量为4.12 kW和4kw,双集热器串联最大能量为7.08 kW和6.69 kW。单、串联集热器平均热效率为4.45%、4.51%,平均火用效率为9.66%、15.17%。所开发的模型可用于设计节能的“管内水式真空管集热器”。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thermal Modeling of Water-in-Tube Type Evacuated Tube Solar Collectors to Predict Outlet Water Temperature: An Experimental Validation
Thermal model is developed to predict the outlet water temperature with respect to time for water-in-tube type evacuated solar collector connected in series. Developed mathematical expression is validated for the single collector and two collectors connected in series. In each collector, there are 20 evacuated tubes connected to the storage tank. Coefficient of Determination (R2), Reduced Chi-Square (χ2), and Root Mean Squared Error (RMSE) have been calculated to show the prediction accuracy of the developed model. For single and two collectors connected in series, R2 is 99.73% and 99.90%, χ2 is 0.46°C and 0.39°C and RMSE is 0.70°C and 0.65°C, respectively. Predicted value shows good agreement with the experimental value. At a constant mass flow rate, the maximum outlet temperature reaches 53.10°C and 71.50°C for single and two collectors in series, respectively. The maximum energy for the single collector is 4.12 kW and 4 kW, while for two collectors connected in series, the maximum energy is 7.08 kW and 6.69 kW. Average thermal efficiency is 4.45% and 4.51% and average exergy efficiency is 9.66% and 15.17% for single and series-connected collectors, respectively. Developed model can design energy-efficient ‘water-in-tube type evacuated tube collector’ for domestic and industrial applications.
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来源期刊
CiteScore
5.00
自引率
26.10%
发文量
98
审稿时长
6.0 months
期刊介绍: The Journal of Solar Energy Engineering - Including Wind Energy and Building Energy Conservation - publishes research papers that contain original work of permanent interest in all areas of solar energy and energy conservation, as well as discussions of policy and regulatory issues that affect renewable energy technologies and their implementation. Papers that do not include original work, but nonetheless present quality analysis or incremental improvements to past work may be published as Technical Briefs. Review papers are accepted but should be discussed with the Editor prior to submission. The Journal also publishes a section called Solar Scenery that features photographs or graphical displays of significant new installations or research facilities.
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