Saturday, February 26, 2011

Floating Solar Panels: Will it catch up?


Availability of space is a major problem for Solar Photovoltaic installations. This is more true in the case of big PV Power Plants where space is a constraint. Generally 4 to 5 acres of land area is needed for a MW of PV installation. This means that the total land area needed for a 50 MW installation is 250 acres which is a huge area. This is a concern for PV generation in areas where the density of population is high and the land value is costly. In my country, I faced this problem when I was trying to design a 1 MW Slar PV Power Plant in Thiruvananthapuram City area. We have only some roof tops available which is not sufficient for 1 MW PV module laying. The idea of laying PV modules in dam catchment areas and lakes are not new for the last several years. The important thing is to lay these modules without affecting the living organisms in water and to maintain it scientifically. The following scientific innovation will be interesting for any PV technologist to try and adapt it to suit to their environment after making proper technological changes.

The company Solaris Synergy believes that their invention provides cheaper electricity and better use of the land area.

Solar panels located on water surfaces have the advantage that they easily can be moved according to the sun’s movements and also prevent the water to the solar cells get too hot. A third advantage is that the water temperature is more constant than air temperature. Large temperature differences, such as in a desert is wearing much on solar cells semiconducting components, but this can be avoided by putting solar cells in water. The placement in freshwater prevents solar evaporation and inhibit algae growth.

Solar cells on water will probably be best placed on industrial ponds, for example at a water treatment plant where solar cells could then provide power to operate the treatment plant.

Developed by a Franco-Israeli partnership, this innovative solar power technology introduces a new paradigm in energy production. Solar power plays a dominant role in the world-wide effort to reduce greenhouse gases, it is considered a clean energy and is an efficient source of electricity. Yet several obstacles have been undermining the expansion of this sector and many of its actors are looking for a new approach towards the markets.

Soon after the design phase was over, at the end of March 2010, the fabrication of a prototype began and the team is now aiming to launch the implementation phase in September 2011. The tests will take place at Cadarache, in the South East of France, the site having a privileged position on the French electric grid and being close to a local hydro-electric facility providing the water surface to be used for the installation of the system. It will operate on-site during a period of nine months, while assessing the system's performances and productivity through seasonal changes and various water levels. The research team members believe that by June 2012, they will have all the information required to allow the technology's entry on the market.

As even leading photovoltaic companies struggle to find land on which to install solar power plants, the project team identified the almost untouched potential of solar installations on water. The water basins, on which the plants could be built, are not natural reserves, tourists' resorts or open sea; rather they are industrial water basins already in use for other purposes. By that, it is assured that the new solar plants will not have a negative impact on natural landscapes. "It's a win-win situation," declares Dr. Kassel, "since there are many water reservoirs with energy, industrial or agricultural uses that are open for energy production use."

After solving the question of space, the team also took on the problem of cost. "It sounds magical to combine sun and water to produce electricity, but we also have to prove that it carries a financial logic for the long run," explains Dr. Kassel. The developers were able to reduce the costs linked to the implementation of the technology by two means. First they reduced the quantity of solar cells used thanks to a sun energy concentration system based on mirrors, while keeping steady the amount of power produced.

Secondly, the team used a creative cooling system using the water on which the solar panels are floating. Thanks to this efficient cooling method, the photovoltaic system can use silicon solar cells, which tend to experience problems linked to overheating and need to be cooled down in order to allow the system to work correctly, unlike standard type more expensive cells. The particular type of solar cell used also allows a higher efficiency than the standard ones, achieving both reliability and cost reduction.

Still for the purpose of making the technology efficient and ready to market, the system is designed in such way that on a solar platform it is possible to assemble as many identical modules as needed for the power rating desired. Each module produces a standard amount of 200 kiloWatt electricity, and more power can be achieved by simply adding more modules to the plant.

The team also worked on the environmental impact of the technology. It works in fact as a breathing surface through which oxygen can penetrate to the water. This feature ensures that sufficient oxygen will maintain the underwater life of plants and animals. Dr. Kassel adds: "One of the implementation phase's goals is to closely monitor the possible effects of this new technology on the environment with the help of specialists" and "a preliminary check shows no detrimental environmental impact on water quality, flora or fauna. Our choices of materials were always made with this concern in mind."

*The project results from a collaboration between Solaris Synergy from Israel and the EDF Group from France. EUREKA provided the supporting platform which allowed to enhance both companies' partnership. After receiving the "EUREKA label" the project, called AQUASUN, found also support from the Israeli Ministry of Industry, Trade and Labor.

Floating solar power plants could be placed at hydroelectric plants, which already have infrastructure for electricity production.It is not realistic to place solar cells on the sea as waves will prevent the optimum angle to the sun. My State of Kerala, "The God's Own Country", is blessed with a lot of lakes and rivers. The catchment areas of our major dams can be utilised for PV module laying if we scientifically design the installations without affecting the fishes and other living organisms. This is one of the areas we need to stress upon for small scale generation of power utilising Photovoltaic technology.

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