Tag Archives: energy
Solar energy- does anyone know of a DIY way to make a solar collector and transfer that energy to batteries?
Question by : Solar energy- does anyone know of a DIY way to make a solar collector and transfer that energy to batteries?
I would like to learn about solar energy and how I can make some panels for my home, of course with in a reasonable budget. My goal is to be able to run a refrigerator and fan off of battery. Any ideas out there?
Answer by lizette
If your goal is to save money, it will be hard to do that with solar electricity. You can come out ahead under some circumstances, but powering a refrigerator and a fan is an unlikely one. However, if your goal is to learn about this kind of setup, you could get a kit from (say) Harbor Freight for a few hundred dollars, which will (barely) charge a car battery over a period of a couple weeks. The energy you collect could power a fan for several hours.
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What do you think? Answer below!
Question by farhana: What are the basic element in wind energy conversion device?
I have to build a wind energy conversion device for my design subject. However, I can’t use toothed gears, gearboxes, energy storage systems (e.g. flywheels, batteries, pressurised fluids, etc), rolling
element bearings and existing (pre-made) fan impellers.
So I need rough ideas on what are the things that can replace those items which can make the device moving.
Answer by WtchTwr
Your basic design goal is to “Build a Wind Energy Conversion Device”. This is a broad goal as it does not specify if the end result needs to produce electrical or simply mechanical energy.
You are limited as you cannot use any rolling element bearings. This can cause a problem for horizontal wind turbines. To avoid this, you can use a vertical wind turbine similar to the following. http://www.ecofriend.com/entry/pacwind-vertical-axis-wind-turbine-at-home/
The curved blades will “catch” the air flow no matter what the wind direction is.
To avoid the use of rolling element bearings, a vertical wind turbine can be supported at the bottom. Ensure both the spinning shaft and the housing are smooth and greased. Supports higher up will also be needed to keep the turbine level. These can be holes cut out of the frame which are close to the spinning shaft.
To transfer the power, use a pulley and belt system. This won’t violate the toothed gear rule. You will incure some efficiency losses as the belts and pulleys will slip.
on the other side of your pulley, you can hook it up to a small generator to generate power continuously as the wind blows, or you can attach if to some mechanical device to provide mechanical power. Just ensure the initial start-up torque isn’t too large.
Know better? Leave your own answer in the comments!
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Video Rating: 4 / 5
Most of the world’s energy resources are being supplied by fossil fuels like coal, oil and natural gas. But the world’s dependence on fossil fuels is no good for several reasons. One is the fact that coal, oil and gas will eventually run out. No one knows exactly when, but the US Department of Energy says we have roughly 104 years of fossil fuels left, and that’s if global consumption stays the same, which it probably won’t. It’s been estimated that by the year 2020, world energy consumption will increase 50 percent. So it’s a matter of decades before the world runs out of its main source of fuel. Another problem caused by burning up 350 quadrillion BTUs of fossil fuel a year, is the creation of a substantial amount of carbon dioxide, which is contributing to global warming and the subsequent melting of the ice-caps. And of course air pollution threatens human health and that of the planet. The solution to all this is to find energy sources that are clean or green, and preferably won’t run out. Green fuel is something the whole world knows it will have to invest in sooner or later. Iran is one of the nations trying to reduce its dependence on fossil fuels. Watch this video on our website: www.presstv.ir
Video Rating: 5 / 5
The gloves came off when Aimee Christensen of Christensen Global Strategies and Ken Green of the American Enterprise Institute headed to the energyNOW! Green Room to continue their discussion on clean energy jobs. Ken Green says when talking about clean energy, it’s important to distinguish between traditional pollutants — like sulfur dioxide, mercury and nitrogen oxide – and greenhouse gases like carbon dioxide. He says the traditional pollutants can be addressed with pollution controls. He says it;s extremely hard to control GHG’s and they should not be in the clean energy discussion. Green agrees that carbon capture and storage may not belong ion the clean energy discussion because he does not believe the technology is effective. Green also says the methodology of measuring greenhouse gases needs to be addressed. He says the EPA recently moved away from measuring GHG emissions and using a computer model to calculate them. He says that leads to different patterns and assumptions on who is exposed. As for energy independence, Green says the nation’s electricity is already independent. The only thing the US is dependent on is oil, and the top source of that is Canada. He says the US also has good relations with Saudi Arabia and Mexico, the next biggest suppliers. Green says some studies have shown that the additional electricity generated to power a large fleet of electric vehicles will actually produce more greenhouse gases than staying with gasoline-powered cars. Green …