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The sun is not always an ally of photovoltaics.
Excessive heat reduces production, as is proven by the global method of measuring the influence of temperature on the efficiency of solar panels has developed a doctoral thesis at the Technical University of Cartagena (UPCT) which also calculates the distance optimal separation between modules and covers that are refrigerated and improve their performance.
The thesis, read this month's UPCT, in the interest of the company Apia XXI to know the electrical performance of photovoltaic panels to reach high temperatures and has tested various forms of refrigeration to improve the performance of solar modules.
Under the title 'Study of the influence of cooling air natural and induced behavior of photovoltaic systems form', research Dew Mazon, directed by professors José Ramón García Cascales and Francisco Vera, separations figure 6 inches are reduced by natural convection, through the chimney effect, between 5 and 6 degrees and the panel temperature increases performance between 0.6 and 1.5%.
Further improvements in production, up to 5% are achieved with induced ventilation, which is only economically viable "if leverages existing airflows on site," says Vera.
The study also states that air channels between the panels and covers and "placing insulating material allows for greater cooling and better electrical performance" in the case of photovoltaic plants on greenhouses, says the researcher.
The doctoral research concludes that it is possible to predict the electrical behavior of a photovoltaic plant from experimental prototypes and developed by the Department of Thermal and Fluids Engineering UPCT for this research, which analyzed the performance of a photovoltaic plant in Seville the summer months and built two experimental facilities on the campus of Alfonso XIII to test the potential cooling on metal roofs, such as industrial buildings, and greenhouses.
Both common locations for solar panels "because the structure is already given," says Francisco Vera.
The study was conducted under the aegis of three research projects with the company in participating teachers Blas Zamora and Antonio Sánchez Parra group Kaiser Fluid Mechanics and Thermal Engineering and professors José Ramón García Vera Cascales and Francisco Garcia Modeling group Thermal and Energy Systems, both research groups UPCT.
Source: UPCT
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