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Collecting energy from raindrops using solar panel technology

Collecting energy from raindrops using solar panel technology
This diagram shows what these D-TENG panels might look like. It also illustrates how the bridge structure, when combined with the lower electrodes, can lead to improved energy storage. Credit: iEnergy, Tsinghua University Press

When raindrops fall from the sky, they can produce a small amount of energy that can be harvested and turned into electricity. It is a small-scale version of hydropower, which uses the kinetic energy of moving water to produce electricity. Researchers have proposed that the energy collected from raindrops could be a potential source of clean, renewable power. However, this technology has been difficult to develop on a large scale, which has limited its practical application.

To collect raindrop energy, a device called a triboelectric nanogenerator (TENG), which uses liquid-solid contact electrification, has been shown to successfully harvest the electricity from raindrops. This technology also successfully harvests energy from waves and other forms of liquid-solid triboelectric .

However, droplet-based TENG (D-TENGs) have a technical limitation from connecting more than one of these panels together, which reduces overall power output. A recently published paper outlines how modeling D-TENG panels after solar panel arrays makes harvesting raindrop energy more efficient, broadening its application.

The paper was published in iEnergy.

"Although D-TENGs have ultra-high instantaneous output power, it is still difficult for a single D-TENG to continuously supply power for megawatt-level electrical equipment. Therefore, it is very important to realize the simultaneous utilization of multiple D-TENGs," said Zong Li, a professor at the Tsinghua Shenzhen International Graduate School at Tsinghua University in Shenzhen, China.

"Referring to the design of solar panels in which multiple solar power generation units are connected in parallel to supply the load, we are proposing a simple and effective method for raindrop energy harvesting."

When multiple D-TENGs are connected, there is unintended coupling capacitance between the panels' upper electrode and lower electrode. This unintended coupling capacitance reduces the power output of the D-TENG arrays. To reduce the effect of this problem, researchers proposed bridge generators, which use array lower electrodes to reduce the influence of the capacitance.

When fall on the surface of the panel, a process called triboelectrification produces and stores the energy from the rain. When the droplet falls on the surface of the panel, called the FEP surface, the droplet becomes positively charged, and the FEP surface negatively charged.

"The amount of charge generated by each droplet is small and the surface charge on the FEP will gradually dissipate. After a long time on the surface, the charges on the FEP surface will gradually accumulate to saturation," said Li. "At this point, the dissipation rate of the FEP's surface charge is balanced with the amount of charge generated by each impact of the droplet."

In order to demonstrate the success of the bridge array generators with the array lower electrodes, the conventional D-TENG was compared to the bridge array generators. Researchers also compared the performance of the bridge array generators with different sizes of sub-electrodes.

The thickness of the panels was also studied to see if that had an effect on any power loss. Increasing the FEP surface thickness lead to decreased coupling capacitance while maintaining the surface charge density, both of which could improve the performance of the bridge array generator.

When bridge array generators were developed for raindrop energy collection and utilized array lower electrodes and bridge reflux structures, the raindrop collection panels could be independent of each other. This means that unintended power loss could be reduced.

"The peak power output of the bridge array generators is nearly 5 times higher than that of the conventional large-area raindrop energy with the same size, reaching 200 watts per square meter, which fully shows its advantages in large-area raindrop energy harvesting. The results of this study will provide a feasible scheme for large-area raindrop energy harvesting," said Li.

More information: Zong Li et al, Rational TENG arrays as a panel for harvesting large-scale raindrop energy, iEnergy (2023). DOI: 10.23919/IEN.2023.0015

Provided by Tsinghua University Press
Citation: Collecting energy from raindrops using solar panel technology (2023, July 19) retrieved 19 April 2024 from https://techxplore.com/news/2023-07-energy-raindrops-solar-panel-technology.html
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