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Geometrical optimization for a photovoltaic installation equipped with flat reflectors based on plane of array estimations
摘要： In order to design, manage and optimize the performance of a photovoltaic (PV) installation and establish a precise power production estimation, irradiance on the plane of array (POA) in relation with the geometrical characteristics of the PV modules installation occupies a high importance. This study focuses on the development of an estimation model of the POA irradiance for a photovoltaic installation equipped with ?at re?ectors. The model includes solar irradiance components (global, direct and diffuse), geometrical parameters and geographical characteristics of the PV installation. Experimental validations have been performed with measurements taken at the SIRTA Observatory (48.7°N, 2.2°E) in Palaiseau, France, for the period starting from June 2017 to June 2018. Results show mean absolute errors (relative to the mean) of 6% and 7% for an installation without and with planar re?ector. Finally, we present several geometrical optimization strategies of the PV-re?ector installation relying on two major variables: the re?ector’s length (LR) compared to the length of the PV module (LPV) and the tilt angle adjustment frequency (monthly, seasonally, ?xed) of the system (for both PV and the re?ectors). The objective of such optimization is to discuss about a reasonable con?guration to achieve a maximum POA irradiance. Results show that the length of the mirrors highly affects the ef?ciency and performances of the PV-Re?ector system and the annual gain increased from 8.5% to 28.7% when going from LR = LPV/2 to LR = 2 (cid:1) LPV compared to a monthly-optimized installation without mirrors. As for the adjustment frequency, we show that a monthly-varied architecture is the most advantageous option with a 28.2 and 31.6% increasing in annual gain compared to a seasonal varied or ?xed ones, respectively.
关键词： ?at re?ectors,PV-re?ector system,plane of array irradiance,geometrical optimization,irradiance estimation
更新于2025-09-23 15:19:57
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Modeling and Experimental Validation of a Low-Cost Radiation Sensor Based on the Photovoltaic Effect for Building Applications
摘要： The energy consumed to cool buildings is very elevated and solar gains represent a high percentage of these cooling loads. To minimize the thermal load it is necessary to control external shading systems. This control requires continuous measurement of solar radiation in different locations of the building. However, for such applications the use of conventional irradiance sensors increases the cost and reduces the profitability of the installation. This paper is focused on the development, modeling, and experimental validation of low cost irradiation sensors based on photovoltaic effect in order to reduce the costs of dynamic external shading devices and to improve the profitability of the system. With this proposal, firstly, small commercial photovoltaic cells have been adapted for use as an irradiation measurement device. Subsequently, quasi-stationary and continuous experimental measurements of these silicon cells, facing south and installed horizontally, have been carried out in Jaén (Spain) in 2009 and 2010. Finally, a nonlinear multiparameter function has been developed to evaluate the irradiance using the electric current generated by the cell, cell temperature, ambient temperature, and absolute humidity. A favorable agreement between the model predictions and experimental data has been observed with a coefficient of determination around 0.996 for all cells.
关键词： thermal drift,solar radiation,photovoltaic,building,solar cells,irradiance estimation
更新于2025-09-23 15:19:57