The good, the bad and the ugly about vertical axis wind turbines

October 21, 2011 by  
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Leka Ram: Vertical axis wind turbines Main rotor shaft is set vertically and the main components are located at the base of the turbine Vertical wind turbines look completely different from the conventional wind turbines that have blades rotating on the horizontal axis. The vertical turbine can be compared to a coin spinning on its vertical axis. Modifications in the design and structure have been done for improving the performance and serving more benefits. The major parts of the vertical wind turbine are a rotor shaft that is arranged vertically, a vertical wind generator located near the ground, a gearbox also located near the ground and the blades that are two or three in number. These wind turbines are being improved in terms of function and design for enjoying more advantages. There are different types of vertical axis wind turbines such as; Darrius turbine : Named after George Darrius, the French inventor. The turbine is known for its efficiency. However, it is criticized for the low torque. It requires an additional rotor to start it. Gorlov Helical turbne : This turbine is designed in a helical configuration and was built to deal with the problems in the Darrius turbine. They are self-starting and reliable. Giromill : It is a variation of Darius turbine. It offers high starting torque and variable pitch. The blades used in this type of turbines are curved, straight or v-shaped. Savonius turbine : The turbine has helical scoops for providing smooth torque. Most of these are self-starting. Apart from these there are many other types such as the neo-aerodynamic turbine, quiet revolution turbine, novel turbine and zephyr turbine. The good Low Cost Lower construction and transportation costs 1. The energy generation with the vertical turbines cost is less and comes to about 2.5-3.5 cents for a kilowatt hour when compared to the 4-5 cents per kilowatt hour. 2. These turbines can handle high wind speeds. The maximum speed for harvesting the energy from wind is 28-33 mph. With the vertical design it can produce electricity from winds with a speed of 70 mph. The design can be used in areas with very strong winds. 3. One of the major problems with the conventional wind mills is that they kill the birds that come in their way. The design of the vertical turbine looks like a solid structure keeping the birds away from it. 4. The new device blends well with the environment. It can be painted in such a way that it blends well with the surroundings. Being smaller they can be installed in areas where huge structures cannot be used. 5. Another advantage is that the generator can be easily accessed for service. There is no magnetic field resonance, interference with communication or aircraft navigation and no ground resonance. 6. They function quietly too. Can this be better? The major difference between the vertical and horizontal wind turbines is the position of the blades. In the horizontal model the blades are mounted on the top while in the vertical model they are at the base of the tower and close to the shaft. The main advantage is that they can be mounted close to the ground making it beneficial for residential purposes. The bad Inefficiency Blades constantly spinning back into the wind causing drag 1. When compared to the horizontal turbines, these vertical axis wind turbines are able to produce only about 50 percent of the energy. 2. Since no tower is required for the structure, they are not able to take advantage of the high wind speeds usually available on elevated and higher areas. 3. Some energy is required to start the device because of the low starting torque. 4. If any part of the device is damaged, the entire structure has to be disassembled for changing it. 5. Wires are required for holding the complete structure in place. 6. The vertical wind turbines have a complicated structure with high rate of failure. 7. Wind efficiency is low and costs higher. Can this be avoided? New designs of the vertical axis turbines are being made in order to deal with the problems faced by the earlier designs. More research and analysis is still required to develop a turbine without the above mentioned drawbacks. The ugly Bird Killing Wind turbines affect migratory birds Though wind energy is considered to be one of the renewable and dependable sources of energy, there are several downsides to this. 1. Wind is not dependable. To turn the blades you need wind. If there is no wind they cannot function effectively. They are great only for areas where you can have wind all through the day and year. They may be useless in areas where wind is less. 2. One of the best places where you can get wind all through the year is the coastal areas, mountain tops and valleys. All these areas are very expensive and it can be very difficult to afford the area first and then build the turbine also. 3. Many people consider wind farms as an eyesore. Though they are able to produce energy using the wind, many people do not like the idea of residing near a wind farm. 4. Apart from that, the turbines are also known to interfere with the radio and television signals, kill birds and make noise. Why are we so critical Every new invention has its advantages and disadvantages. Similarly, the wind turbines faced some problems with respect to the availability of winds for turning the turbines, birds coming in between and so on. However, the researchers are trying to find solutions to each of these problems by creating new designs and using improved technologies. This gave rise to the vertical axis turbines. Though there are some negative aspects to this too, the researchers are striving hard to overcome them. Wind is everywhere. We need to make proper efforts to use it to the maximum in order to save other sources of energy and use the renewable sources in an effective way. The bottom line Wind energy is renewable. More and more devices have to be developed to harness the wind energy for generating electricity. The wind mills are efficient in generating energy. The type of turbines used depends on the area and the amount of power required in that particular area.

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The good, the bad and the ugly about vertical axis wind turbines

Seven ways to recycle old NES controllers

October 21, 2011 by  
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SARASWATI DEVI: NES MP3 player NES controllers recycled to MP3 players Nintendo Entertainment System (NES) is an icon of gaming world. NES controllers made all the game lovers crazy as it provided the platform for the early popular games like Super Mario and Contra. NES controllers entered the market in 1980s and it traveled for almost 30 years now but its existence has not been faded as gamers have incorporated creative thoughts and recycled NES controllers to keep them always closer to their heart. Let’s have a look at the seven ways to recycle old NES controllers: 1. NES PC card reader NES card reader NES controller recycled into PC card reader. Ryan McFarland has designed an amazing PC card readers by recycling old NES controllers. It can be created at your home itself by employing a card reader, an NES controller and a tool box having screw driver and glue. For making your own NES card reader, unscrew the NES controller and card reader then fit the circuit board of the card reader into an empty NES controller. After fitting the card reader’s circuit board into the NES controller, screw it up. This finalizes your NES PC card reader. NES PC card readers are fully functional and are also break resistant. 2. NES belt buckle NES belt buckle NES controller recycled into belt buckle with sound effects. NES controllers can also be recycled into belt buckles with sound effects making it a fantastic option for party wearing. To prepare an NES belt buckle, you just need to merge a sound key chain’s circuit board into an empty NES controller. After gluing the sound key chain’s circuit board in the NES controller, screw it up. This finalizes your NES belt buckle. You can choose a sound key chain of your own choice and incorporate it into the NES controller. It is a fantastic product to enhance your occasional wearing. 3. NES USB controller NES USB controller NES controller recycled into USB device. NES controllers can also be recycled into a USB device offering plug and play features. You just need to fit the USB controller’s circuit board into the NES controller after dissembling them. These USB controllers are fully compatible with all version of operating systems and they don’t require the installation of software after plunging it into the PC as they are plug and play devices. It also gives an extra dimension to the design of your tech products. 4. NES controller wallet NES Wallet NES controllers recycled into a wallet A wallet designed from old NES controller is a unique concept. For designing your own NES controller wallet, you need a NES controller, wire snippier, long zip and glue. For designing it, dissemble the NES controller and then glue the rubber buttons to ensure that it don’t fall. After fixing the rubber buttons, glue a long zip covering all the sides of the controller to finalize your wallet. NES controller wallets apart from having sporty look also offer durability. 5. NES controller mouse NES Mouse NES controller recycled to a mouse. NES controllers can also be recycled into a fully functional mouse. For structuring your own NES controller mouse, disassemble an NES controller and a mouse. After disassembling them, incorporate the circuit board of mouse into the NES controller. Don’t forget to open a hole for mouse sensor. After soldering all the wires, screw the NES controller which finalizes your NES controller mouse. It is a great design for those who want to experiment with their PC accessories. 6. NES controller storage box NES Storage Box Nintendo controller recycled into a nifty storage box. A storage box can also be designed by recycling an NES controller. To create your own NES controller storage box, you just need to disassemble the NES controller and glue the rubber buttons to ensure that they are fixed at their place. This finalizes your NES controller storage box which has enough space to store push pins, paper clips, keys, etc. It is a great idea for gamers. 7. NES controller MP3 player NES MP3 player NES controllers recycled to MP3 players NES controllers can also be recycled into an MP3 player. For designing your own NES MP3 player, modify your controller in accordance to the shape of the MP3 player and solder the disassembled parts of the player into the empty NES controller. It is a concept design for those who are passionate for both NES controllers and music.

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Seven ways to recycle old NES controllers

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