Welcome to Renewable Energy Info
Renewable energy sources have diverse origins, a feature that demands equally diverse technologies to capture them. My interest in these (new) technologies resulted in this blog. If will focus on well developed technologies that are already put into practice, and on promising technologies that are still under development.
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Monday, March 25, 2013
Monday, July 19, 2010
Anyway, if this would make sense, it would already be developed I think. Still, I was happy to read an article on the Scientific American website where they explain how salts can be used to store solar energy. Part of a so-called parabolic trough solar-thermal power plant, the salts will soon help the facility light up the night—literally. Because most salts only melt at high temperatures (table salt, for example, melts at around 1472 degrees Fahrenheit, or 800 degrees Celsius) and do not turn to vapor until they get considerably hotter—they can be used to store a lot of the sun's energy as heat. Simply use the sunlight to heat up the salts and put those molten salts in proximity to water via a heat exchanger. Hot steam can then be made to turn turbines without losing too much of the original absorbed solar energy.
Monday, November 3, 2008
The Solyndra system is designed to optimize photo voltaic (PV) performance on commercial rooftops by converting more of the sunlight that strikes the total rooftop area into electricity.
Solyndra's panels employ cylindrical modules which capture sunlight across a 360-degree photovoltaic surface capable of converting direct, diffuse and reflected sunlight into electricity. Solyndra's panels perform optimally when mounted horizontally and packed closely together, thereby covering significantly more of the typically available roof area and producing more electricity per rooftop on an annual basis than a conventional panel installation. The result is significantly more solar electricity per rooftop per year.
The Solyndra system is lightweight and the panels allow wind to blow through them. These factors enable the installation of PV on a broader range of rooftops without anchoring or ballast, which are inherently problematic. The horizontal mounting and unique "air-flow" properties of Solyndra's solar panel design substantially simplify the installation process for Solyndra's PV systems. The ease of installation and simpler mounting hardware of the Solyndra system enables its customers to realize significant savings on installation costs.
Using proprietary cylindrical CIGS modules and thin-film technology, Solyndra systems are designed to provide the lowest installation cost per system and the highest annual solar electrical energy output for typical low slope commercial rooftops.
Saturday, October 4, 2008
Actually, the Dutch company Ooms Avenhorn, has been exploring this patch for almost a decade now, and has already proved that it is working! They have developed a so-called Road Energy System® (RES), where the collection of solar energy from the asphalt is combined with underground storage, to create a year-round system which can cover heating requirements in the winter and cooling in the summer.
A latticework of flexible plastic pipes, held in place by a plastic grid, is covered over by asphalt, which magnifies the sun's thermal power. As cool water in the pipes is heated, it is pumped deep under the ground to natural aquifers where it maintains a fairly constant temperature of about 68 F. The heated water can be retrieved months later to keep the road surface ice-free in winter.
Recently, researchers at Worcester Polytechnic Institute have done a batch of research on this and their experiments figured out that the part of the asphalt gets hottest, turns out to be about two centimeters below the surface. Then they tried to figure out how to make it even hotter. The painted an anti-reflective coating to their test blocks, and then added highly thermally conductive quartzite to the mix.
The result is blacktop that gets even hotter and stays hotter for longer than regular asphalt. Of course, this left them with the problem of how to get the energy out of the road. By laying down a series of flexible and highly conductive copper pipes before pouring the asphalt they were able to pump water through the asphalt, picking up the heat, for use in power generation.
However, project leaders hoped to replace the copper pipes with a "highly efficient heat exchanger." Whether or not that would be water based, or exchange heat some other way, we don't know.
The system has several large advantages over traditional photo-voltaic power.
- It's really cheap
- They don't need to find extra land
- It's invisible to the average person
- Blacktop stays hot, and could produce power for hours after the sun goes down
- There are roads and parking lots everywhere power is needed.
Wednesday, September 24, 2008
Recently, Ocean Power Technologies, Inc. has announce d that it has deployed its first PowerBuoy® under contract with Iberdrola S.A., one of the world’s largest renewable energy companies. As noted by Iberdrola, the deployment of OPT’s PB40 PowerBuoy is the latest milestone toward the building of the world’s first commercial utility-scale wave power generation venture to supply approximately 1.39 MW of electricity into Spain’s electricity grid. The PB40, incorporating OPT’s patented wave power technology, is the first of what is expected to be a 10-PowerBuoy wave power station to be built out in a later phase of the project, and generating enough electricity to supply up to 2,500 homes annually.
Another clean-tech company that is developing technology to generate electricity from the energy from the ocean's waves, is AWS Ocean Energy. AWS stands for Archimedes Wave Swing, and their lead product is the award-winning Archimedes Waveswing™ wave energy converter. This is a cylinder shaped buoy, moored to the seabed. Passing waves move an air-filled upper casing against a lower fixed cylinder, with up and down movement converted into electricity.
As a wave crest approaches, the water pressure on the top of the cylinder increases and the upper part or 'floater' compresses the gas within the cylinder to balance the pressures. The reverse happens as the wave trough passes and the cylinder expands. The relative movement between the floater and the lower part or silo is converted to electricity by means of a hydraulic system and motor-generator set.