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In Egypt, a new technique is being developed to cool solar panels. A mixture of water, aluminum oxide and calcium chloride hexahydrate cools the photovoltaic modules.

This research, conducted in Cairo, builds on previous research by Sunbooster in France. The technology was successful and made it possible to cool solar modules when their ambient temperature exceeded 25 ° C.

The tubes spread a thin film of water on the glass surface of the panels. The solution has been implemented in rooftop photovoltaic systems and in terrestrial solar power plants. The technology allows an annual increase in electricity production of between 8% and 12%.

In this innovation, researchers at Benha University applied various mixtures of their passive coolants to a 50W polycrystalline photovoltaic panel.

A refrigeration unit, a DC pump, valves, a water flow meter and connecting pipes provided a system with aluminum channels under the panels for water and Al2O3 / PCM mixture. The panels were adjusted to the south and oriented at 30 ° from the horizontal.

How it works.

The PCM mixture was heated to the melting point to form a liquid and Al2O3 nanoparticles were added to the aluminum channels.

The dispersion of the particles in the PCM liquid is carried out by means of a shaker bath at four different mass concentrations.

Application of the cooling system, either using water and / or [la] The Al2O3 / PCM mixture provides a noticeable drop in cell temperature compared to [panel] not cooled.

Researchers claim that a mixture of water and liquid Al2O3 / CFM outperformed the use of water alone, and the best performance recorded used 75% water and 25% Al2O3 / CFM.

The research results are explained in more detail in the article “Improvement of the performance of photovoltaic cells by Al2O3 / PCM mixture and / or water cooling techniques“, Published in the magazine Renewable energy.

It is not disputed whether this is a cost effective solution, whether the increased revenue through increased energy production (through greater efficiency) outweighs the costs of the solution. Assuming it pays off in some areas, these are probably the places where the panels get very hot.

More information: www.pv-magazine.com