研究目的
The development, modeling, and experimental validation of low cost irradiation sensors based on photovoltaic effect to reduce the costs of dynamic external shading devices and to improve the profitability of the system.
研究成果
A favorable agreement between the model predictions and experimental data has been observed with a coefficient of determination around 0.996 for all cells. The results obtained show that these cells can be used for estimating solar radiation. The cost of these cells is estimated at around 40 euros compared to 355 euros for the devices currently on the market.
研究不足
The temperature dependence is the most important factor when using photodetectors (solar cells) to estimate solar radiation. The original calibration curve provided by the cell’s supplier is not useful in this case because it is made for a constant 20 °C temperature.
1：Experimental Design and Method Selection:
Small commercial photovoltaic cells were adapted for use as an irradiation measurement device. Quasi-stationary and continuous experimental measurements of these silicon cells were carried out in Jaén (Spain) in 2009 and 2010. A nonlinear multiparameter function was developed to evaluate the irradiance using the electric current generated by the cell, cell temperature, ambient temperature, and absolute humidity.
2：A nonlinear multiparameter function was developed to evaluate the irradiance using the electric current generated by the cell, cell temperature, ambient temperature, and absolute humidity.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The cells were tested over two years (2009 and 2010) in a building at the University of Jaén, located in Jaén (Spain).
3：List of Experimental Equipment and Materials:
Small, high-efficiency single-crystal silicon cells with the dimensions 3.5 cm × 5.5 cm were used. A temperature sensor was added to measure the temperature of the cell. A shunt resistor (Rs) of 1 ? was used to convert the electric current into voltage.
4：5 cm × 5 cm were used. A temperature sensor was added to measure the temperature of the cell. A shunt resistor (Rs) of 1 ? was used to convert the electric current into voltage.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The cells were preconditioned to sunlight and then calibrated over a period of two weeks. Quasi-stationary and continuous tests were performed to observe the dynamic behavior of the cell.
5：Data Analysis Methods:
A nonlinear multiparameter function was adjusted to evaluate the irradiance. The coefficient of determination r2 was used to establish the robustness of the characterization.
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