Questions tagged [renewable-energy]
Energy sources that do not rely on the consumption of an exhaustible fuel. Tidal, geothermal, and the direct and indirect solar energies (direct: photovoltaics, CSP, solar thermal; indirect: wind, wave, biomass) are renewable energy.
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Losses occurring in solar cells [closed]
If a solar cell is subjected to a light of intensity $1000$ $\text{W/m^2}$, the output at the cell is much less than ideal case scenario. What are all the factors causing energy losses in a solar cell?...
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Why is Alternative energy most commonly stored in metal acid batteries? [closed]
Why is alternative energy most commonly stored in relatively expensive metal acid batteries, which have a short life, rather than hydrogen gas accumulated through electrolysis?
Hydrogen is a ...
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Can aurorae/northern lights be used as an energy source?
Their temperature is high, they have high velocity. Can they be used as an source of energy? If not why? If yes how?
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How do solar panels and wind turbines prove the law of conservation of energy?
The law of conservation of energy makes sense to me in certain systems but in others I can't seem to comprehend it. For example, a car moves because the stored chemical energy within its fuel is ...
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Water turbine power generation for large and small turbines
If you have a small water turbine and a larger water turbine in a river, would the larger turbine produce more power or would they produce the same because of the equal speed of the river?
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Changing number of wind turbine blades
I have read (and to some degree understood) that if one were to increase the number of blades for a wind turbine, it would be reasonable to reduce its rotational speed. In my mind I'd associate this ...
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Solar power with parabolic mirrors/lenses + peltier elements?
Peltier elements are used to use electricity create temperature gradients for example for the purpose of cooling electronics (and then in a secondary step remove the heat from the hot side).
However ...
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I think I may have found a renewable energy source [closed]
Hello guys so I have this idea of mine which I can't get my head around and I need someone to tell me why it won't work, so let's say you have a fully pressurised tank of air and you blow that ...
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Is there a temperature drop at the rotor plane of a wind turbine?
A wind turbine rotor produces power from the torque generated by the rotor blades. This torque arises from forces on blade elements which in turn are the consequence of pressure differences on each ...
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Wind turbine design question [closed]
I am planning to design a wind turbine that is has rotor blade radius of 0.915m and is connected to a generator. The generators specifications are, it is an ac generator with 5000 coil turnings and a ...
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Measurements of the pressure drop across wind turbines?
Mathematical analyses of wind turbines show that a discontinuous pressure drop happens at the rotor plane. I am looking for measurements of this effect, but I could not find any. Do you know any (...
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Solar energy in a specific location
How to find the amount of solar power in a specific location on Earth per month?
By solar power I mean the energy received from the sun in a squared meter.
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How to calculate power necessary generated from wind turbine to run a motor
I was making a small/cheap wind turbine, and I am stuck on how to calculate the power needed (speed of wind) to run a brushed motor (since I figured that would be the easiest to run with rotor blades ...
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Could sound be considered a kind of renewable energy? [closed]
Is sound energy useful as a source for generating electricity? If so, could it be a renewable resource?
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which is efficient on solar electricity by photo voltaic or thermal
As we know solar energy used to generate electricity in two major ways: photovoltaic and thermal energy. The most small applications or personal use are mostly using solar cells. But when it comes to ...
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