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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Growth of Current in an Inductor Connected Across a Battery [duplicate]
When baterry is connected across inductor with no resistance in circuit, won't the current flowing through it be zero, as inductor back emf will counteract the effect of potential difference due to ...
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Is cold fusion the only avenue for fusion reactors? [closed]
To my understanding, cold fusion proposes a solution to usable fusion reactions by finding a way to fuse nuclei at room or near-room temperatures. However, I also understand that improving energy in ...
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Total flux is bigger than radiation flux, error?
The topic of this question is the collection of radiation from the sun. (renewable energy course) The total radiation flux is $$I_\text{total} = I_\text{direct}+I_\text{diffracted}+I_\text{reflected} ....
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Ground source cooling -- why do you need the heat pump? [closed]
This answer says that the water from a ground source is always 50F. (I think this varies by location, but the concept is valid, anyway.) Why do we even need a heat pump? Why not just run that cold ...
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Why is the ground warm during winter and vice-versa?
I was just looking at the geothermal house heating in Iceland, and came to know that in the winter the water is warm, hence cools the house, but how is it hot, not about us feeling it.. My question is ...
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Is it possible to boost solar panel output using wavelength shifting materials?
Solar panels only produce energy from a small section of the total wavelength spectrum of light. I believe some panels have a mirrored back to pass light through the solar panel a second time. Much of ...
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If water vapour is a green house gas , then how is using hydrogen fuel cell stopping global warming?
Hydrogen fuel cells produce water vapour then aren't they also contributing towards global warming ?
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High altitude Concentrated Solar Power (CSP)
Are there any advantages in terms of energy output and efficiency in installing a high altitude concentrated solar power facility? Hypothetically speaking, what if we could build a facility similar to ...
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Energy lost to hydrogen fuel cell
So I have a question about an experiment we did in class.
We used a fan to blow air at a little wind turbine to generate electricity, we connected the turbine to a reversible PEM fuel cell to ...
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Can you use the water flow exiting a hydroelectric generator to generate more energy?
In videos of hydroelectric generators I often see that the water that exits a turbine is still moving with significant velocity.
Example of a turbine that has exit water flow with significant velocity:...
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Is Gravity Storage a pipe dream? [closed]
Background
Energy Vault has a new Gravity Storage system its spruiking (Link here). They are getting a lot of attention and funding. However I am skeptical on the technology and I don't understand why ...
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How does the combination of freeze distillation and osmotic power respect the conservation of energy?
So imagine the following system.
You're in a cold part of the world. Sea water isn't isn't frozen over due to the ocean moderating temperature, but smaller lakes definitely have by now.
Sea water ...
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Unusual temperature shape in gravel heat storage
I’m currently doing undergrad research on using a gravel (basalt 2-5mm grain size) bed as an heat storage. In order to heat up the gravel inside, hot (~100°C) and dry (RF<4%) air with a pressure of ...
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Tesla patented a device he believes gathered energy from light. (US 685,957 - Apparatus for the Utilization of Radiant Energy): [duplicate]
The invention is a sheet metal (top) place high above the ground. The sheet of metal is connected to a capacitor (the ⊔⊓ shapes) connected to the Earth. (The other stuff on the right of the image is a ...
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Creating a Bouyancy Force Generator
How much energy is needed to maintain boiling water? (I'm assuming $1400~\rm W$). With that said, when air is added to an object to decrease its density, does the strength of its buoyant force ...
