Floating solar farm mooring system that tracks the sun: Nuno Correia, Carla Gomes and team named finalists for European Inventor Award 2022
- Portuguese engineers Nuno Correia, Carla Gomes and team jointly nominated for European Patent Office (EPO) prize for developing a flexible mooring system for floating solar farms that tracks the sun
- The system allows an island with photovoltaic (PV) solar panels to rotate, and the panels themselves to be tilted to maximise the solar energy captured
- The floating photovoltaic system has additional environmental benefits such as reducing water evaporation and preventing surface algae growth
Munich, 17 May 2022 - The European Patent Office (EPO) announces that Portuguese engineers Nuno Correia, Carla Gomes and team have been nominated for the European Inventor Award 2022 for their mooring system for floating solar farms that tracks the sun by rotating the island and tilting its photovoltaic panels.
The dynamic nature of their floating solar farm system makes it possible to maximise the solar energy captured and increase panel efficiency by up to 40% compared to stationary solutions. With the global shift towards carbon neutrality, interest in floating solar farms is growing because they don't take up land that could be used to grow crops, which is becoming scarce worldwide due to factors such as pollution and erosion.
"Nuno Correia and Cara Gomes have come up with a solution that improves the production of solar energy," says EPO President António Campinos, announcing the European Inventor Award 2022 finalists. "Their invention is an excellent example of technology that can help reduce our dependency on fossil fuels and improve the sustainable use of land resources, while also encouraging investment in renewable energy on a larger scale."
Correia and Gomes, who developed the invention at the Institute of Science and Innovation in Mechanical and Industrial Engineering (INEGI) in Porto, are jointly named as one of four finalists in the "SMEs" category, which recognises exceptional inventors in small companies with fewer than 250 employees and an annual turnover of less than EUR 50 million. The winners of the 2022 edition of the EPO's European Inventor Award will be announced at a virtual ceremony on 21 June.
Developing a floating, sun-tracking solar farm
Correia, Gomes and the team at INEGI were contracted by Portuguese company SolarisFloat to develop a floating system of photovoltaic panels that can track the sun to produce more solar power. On land, industrial solar panels can be mounted on systems that allow the panels to turn towards the sun, but the same approach is more difficult to implement on water and so far, has only been attempted in a few floating designs.
The system developed by Correia and Gomes, called PROTEVS, operates autonomously using an onboard control system. It contains 180 photovoltaic panels in a circular "island" of about 38 metres in diameter, which rotates at a slow pace around a central point powered by electric motors. The system turns in one direction during the day, following the sun, and in the opposite direction at night to return it to its original position. The panels themselves can also be tilted depending on the sun's position.
The system is designed to be used in relatively calm water bodies such as lakes and reservoirs. To accommodate changes in water levels, the island of panels is fixed in place by an outer ring moored with cables and anchors of a flexible length so it can move up and down by up to 20 or 30 metres. It's also designed to be long-lasting and built to resist a variety of environmental conditions, such as saline water and waves up to one-metre high. Made from 100% recycled materials, it can also be recycled after use.
Installing PV systems on water can improve their efficiency by up to 15% compared to when installed on land, since water-cooled air keeps the panels at a lower temperature and ensures they're operating efficiently. "Having these systems on water means that we're not occupying arable land with the production of photovoltaic energy," says Correia. "That's important if we're trying to produce a large amount of energy in renewables."
While developing their system, the team carried out an environmental analysis and found additional benefits. By creating shadows and acting as a wind-break, the platform lowers the water temperature and reduces evaporation of the water body by up to 60%. Colder water can hold more dissolved oxygen than warmer water, which helps aquatic organisms to flourish and reduces the ability of algae to grow on the surface. Limiting evaporation can also help mitigate water shortages - a concern in many countries such as Portugal where there is a lack of rainfall due to global warming.
The effects of PROTEVS on local ecosystems is now being further evaluated in a pilot project with a consortium led by the Netherlands Organisation for Applied Scientific Research (TNO).
Preparing for commercial use
SolarisFloat outsourced the development of PROTEVS to INEGI in order to speed up the research and development. While Correia, Gomes and the team are named on the patent, it is owned by SolarisFloat, who will now market the product. Correia says the patent was instrumental in getting the system off the ground. "In this field, I don't think anyone would have put in the money as they did without a patent," he says.
The biggest market for the system is in Europe, with partners also in India and potentially in South America. Brazil is home to some of the world's largest reservoirs, which are currently used for hydropower, but floating solar power plants could supply 80% of the country's energy if they were to cover 8% of the area in 165 large reservoirs. SolarisFloat is also considering developing an offshore solution in the near future. The market for floating solar panels is expected to grow by more than 24 % between 2022 and 2030.
Notes to the editor
About the inventors
Nuno Correia was born in Vila Nova de Gaia, Portugal. He holds a master's/undergraduate degree in mechanical engineering from the University of Porto (2000) and a PhD in mechanical engineering from the University of Nottingham (2004). After his studies, Correia completed a post-doc at the Institute of Science and Innovation in Mechanical and Industrial Engineering (INEGI) in Porto. In 2006, he became director of the Materials and Composite Structures Unit at INEGI.
Carla Gomes has a master's degree in polymer engineering from the University of Minho in Braga (2008) and is currently pursuing a PhD in mechanical engineering at the University of Porto. In 2008, Gomes spent a year working as a technical designer at Reopoly, an engineering company specialising in thermoplastic processes based in Leiria, Portugal. She was then hired at INEGI in 2010 to work on polymer engineering projects and was promoted to project manager in 2013. In February 2022, Gomes started a new job as project manager at CorPower Ocean, a leading wave energy technology developer.
The engineers are named inventors of on European patents EP3571762B1 (granted 2020) and EP3515802B1 (granted 2020).
About the European Inventor Award
The European Inventor Award is one of Europe's most prestigious innovation prizes. Launched by the EPO in 2006, the award honours individuals and teams' solutions to some of the biggest challenges of our times. The finalists and winners are selected by an independent jury comprising former Award finalists. Together, they examine the proposals for their contribution towards technical progress, social and sustainable development and economic prosperity. The EPO will confer the Award in four categories (Industry, Research, SMEs and Non-EPO countries), as well as announcing a Lifetime achievement award at a virtual ceremony on 21 June. In addition, the public selects the Popular Prize winner from the 13 finalists by voting on the EPO website in the run-up to the ceremony. Voting is open until 21 June 2022. Read more on the European Inventor Award eligibility and selection criteria.
This year, for the first time, the EPO will also award bright young minds with the Young Inventors prize. The new prize offers a monetary reward to the three finalists to further encourage them to find creative solutions to pressing sustainable development challenges.
About the EPO
With 6 400 staff, the European Patent Office (EPO) is one of the largest public service institutions in Europe. Headquartered in Munich with offices in Berlin, Brussels, The Hague and Vienna, the EPO was founded with the aim of strengthening co-operation on patents in Europe. Through the EPO's centralised patent granting procedure, inventors are able to obtain high-quality patent protection in up to 44 countries, covering a market of some 700 million people. The EPO is also the world's leading authority in patent information and patent searching.
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