22-06-2011, 12:15 PM
hey frendz i m studing in final yr b.tech electrical.i needed project on renewable energy sources or electrical machines.so plz help me by giving suggestion or however u can..plz
22-06-2011, 12:15 PM
hey frendz i m studing in final yr b.tech electrical.i needed project on renewable energy sources or electrical machines.so plz help me by giving suggestion or however u can..plz
24-06-2011, 11:16 AM
hi friend you can refer these pages to get the details on renewable energy sources
https://seminarproject.net/Thread-renewa...ources-ppt https://seminarproject.net/Thread-renewa...rification
18-12-2012, 12:20 PM
You want a complete project or An idea to do a project?
Make it Clear ...
18-12-2012, 03:19 PM
Pls i want to rewrite this topic as my final year project thanks
21-02-2013, 05:19 PM
thanks for giving downloading chances to me thanks for giving downloading chances to me thanks for giving downloading chances to me
22-02-2013, 12:12 PM
to get information about the topic"renewable energy sources" full report ppt and ralated topic refer the link bellow
https://seminarproject.net/Thread-renewa...ources-ppt https://seminarproject.net/Thread-renewa...rification
16-05-2014, 11:03 AM
Renewable Sources of Energy Renewable Sources .docx (Size: 1.24 MB / Downloads: 14) Geothermal energy – Thermal energy generated inside the Earth such as hot springs and thermal vents is harnessed to make electrical energy. Ocean energy – Using the energy from waves or thermal energy in the middle of the ocean to create electrical energy. Thermoelectric – Harnesses the thermal energy differences with thermal couplingd to create electricity. Artificial Photosynthesis – Scientists are still researching this new technique that uses nanotechnology to store electromagnetic energy. Cellulosic ethanol – Using enzymes to create ethanol from biomass. Still a new and emerging technology still under development. What is Wind Power? Wind power is the production of electrical energy from the power of Earth’s winds. Wind turbines harness the energy of the wind to create this electrical energy. Wind turbines are essentially just electrical generators with large rotors attached to turn the gears when the wind blows. Wind turbines have the potential to power your home or city with no effect on the environment. Wind farms are areas filled with nothing but wind turbines to make electrical energy. These wind farms are commonly found on the West Coast of the United States in large fields or in the pacific ocean. In addition to these farms it is possible for single households to harness the power of the winds and have a personal wind turbine for personal home usage. Although very expensive to erect and maintain a wind turbine could easily provide enough power for a household in a windy region. Wind turbines create energy that is then either fed into the grid or directly into your home. The electrical energy produced by the turbines is completely emission free and an environmentally friendly substitute to the fossil fuels that most energy is produced from today. Wind energy is a green renewable resource that is plentiful and has many capabilities. What is Biomass? Biomass energy is a renewable energy resource that derives its energy from plant materials. Wood is the most common and still the largest biomass energy source currently, but breakthroughs in research have increased biofuel to encompass food crops, algae, and industrial waste to make biomass. Biomass materials harness the power inside the plant matter to make this energy. Plants store this energy through the process of photosynthesis which stores the energy of the sun inside the plant; when the plant is combusted or burned it releases this energy which can be used as a substitute for nonrenewable fossil fuels. Essentially biomass utilizes the energy of the sun, stored inside plants, to create a renewable energy source. Performance/Costs: To compare performance ratings, look for a Solar Rating & Certification Corporation (SRCC) or Florida Solar Energy Center (FSEC) sticker on the equipment you are considering. Paybacks - (The amount of time required - usually in years - for positive cash flows to equal the total investment costs. This is often used to describe how long it will take for energy savings resulting from using more energy-efficient equipment to equal the premium paid to purchase the more energy-efficient equipment.) - vary widely, but for a well-designed and properly installed solar water heater, you can expect a simple payback of 4 to 10 years, depending on climate and utility costs. FSEC found that solar water heaters offer potential savings, compared to electric water heating, of as much as 50% to 85% in the water heating portion of the utility bill. Flat-plate collectors The majority of solar collectors that are sold in many countries are of the flat-plate variety. The main components of these are a transparent front cover, collector housing and an absorber. The absorber, inside the flatplate collector housing, converts sunlight to heat and transfers it to water in the absorber tubes. As the collector can reach stagnation temperatures up to 200°C (i.e. when no water flows through), all the materials used must be able to resist such heat. Therefore, the absorber is usually made of metal materials such as copper, steel or aluminium. The collector housing can be made of plastic, metal or wood, and the glass front cover must be sealed so that heat does not escape, and dirt, insects or humidity do not get into the collector itself. Many collectors also have controlled ventilation, so as to avoid condensation inside the glass front cover. The collector housing is highly insulated at the back and sides, keeping heat losses low. However, there are still some collector heat losses, mainly due to the temperature difference between the absorber and ambient air, and these are subdivided into convection and radiation losses. The former are caused by air movements, while the latter are caused by exchange of heat by radiation between the absorber and the environment. A sheet of glass covers the collector as it faces the sun, and this helps to prevent most of the convection losses. Furthermore, it reduces heat radiation from the absorber into the environment in a similar way as a greenhouse does. However, the glass also reflects a small part of the sunlight, which does not then reach the absorber at all. Figure 1 shows the processes occurring at a flat-plate collector. Evacuated-tube collectors Convection heat loss due to air movements inside the collector can be significantly reduced by maintaining a vacuum between the front cover and the absorber of a flatplate collector. As the ambient air pressure would then force the front cover against the absorber, small supports must be used between the back of the collector and the cover, to keep the cover itself in shape. It is difficult to maintain the vacuum over a long period of time, since ambient air will always find a way between the glass and the housing to get into the collector, and an evacuated flat-plate collector therefore has to be evacuated again from time to time. These disadvantages can be avoided with evacuated-tube collectors. The high (almost complete) vacuum inside the closed glass tube of the evacuated-tube collector is more stable over a long period of time than in an evacuated flat-plate collector. Due to their shape, glass tubes can better resist the ambient air pressure, and therefore no supports are needed between the back and front sides. An evacuated-tube collector comprises a closed glass tube, inside which is a metal absorber sheet with a heat pipe in the middle, containing a temperature-sensitive medium such as methanol. The sun heats up and vaporizes this heat pipe fluid, and the vapour then rises to the condenser and heat exchanger at the end of the pipe. There, the vapour condenses, and transfers heat to the heat carrier of the solar cycle, water with antifreeze agent. The condensed fluid flows back to the bottom of the heat pipe where the sun begins heating it up again. To work properly, the pipes must have a minimum angle of inclination, in order for the vapour to rise and the fluid to flow back. A cross-section of the evacuated-tube collector and the principle of its operation is shown in Figure 2. With some evacuated-tube collectors, the heat pipe passes through the end of the glass tube, so that the heat transfer medium of the solar cycle can flow directly through it. A heat exchanger is not needed with this type of collector, and the collector does not have to be mounted at the minimum angle of inclination. |
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