PV module cooling techniques at a glance – pv magazine International

0

Egyptian researchers have analyzed all cooling techniques for cooling solar modules. Their review includes passive and active cooling methods, cooling with phase change materials (PCM), and cooling with PCM and other additives, such as nanoparticles or porous metal.

Researchers from Benha University in Egypt have reviewed and analyzed all the cooling techniques developed to date at the research level to reduce the operating temperatures of solar panels.

Their analysis included passive and active cooling methods, cooling with PCMs, and cooling with PCMs and other additives, such as nanoparticles or porous metal.

“Many studies have made a general review of PV solar cell cooling methods, especially the first three methods,” the scientists said. “Therefore, the current research is characterized by dealing with different cooling techniques, focusing on the fourth method and summarizing all research that has focused on cooling PV solar cells with PCM and porous metal.”

For the active cooling category, the researchers analyzed forced air cooling and forced water cooling, as well as techniques that use water circulating through photovoltaic-thermal panels to cool the temperature of the PV module. The scientists said these methods are the most expensive but the most effective in reducing PV module temperatures. They said active cooling ensures even temperature distribution through improved heat exchanger designs.

“The active cooling technique is considered an effective way to improve photovoltaic performance, but it depends on an external power source, so the external power is deducted from the power produced by the PV cells, which reduces the net output power produced by the PV cells,” they said.

They described passive technologies as cheaper than their active counterparts. They said they could only lower module temperatures by a “small percentage”. These methods include natural air cooling, natural water cooling, and heat pipes.

“Immersion cooling, heat pipes, natural air cooling with fins, heat sinks, and improved heat exchanger designs have been shown to produce uniform temperature in most photovoltaic installations. Heat pipe cooling with its high heat flow dissipation capability has been shown to be effective for PV cooling,” the research group said.

Scientists have stated that PCMs are effective at absorbing excess heat from solar panels that is not converted into electrical energy.

“The latent heat from the PCM helps lower the panel temperature, bringing it closer to 25°C and keeping it almost constant during peak sunny hours,” they said, adding that the system efficiency is higher. in summer than in winter.

The Egyptian group said that despite several promising features, advanced experiments with PCMs with additives are still needed to assess the feasibility of organic and combined PCMs in PV cooling. The porous metal was found to be cheaper than the nanoparticles.

They explained their findings in “A Review of Cooling Techniques Used to Improve the Efficiency of Photovoltaic Power Systems,” recently published in Environmental Science and Pollution Research.

This content is copyrighted and may not be reused. If you wish to cooperate with us and wish to reuse some of our content, please contact: editors@pv-magazine.com.

Share.

Comments are closed.