Wind energy Definition and 21 Threads

For the avaliable power to be harvested in free-streaming wind: P=1/2QU^2_infinite (Q: mass flow rate, U_infinite: velocity of free-streaming wind) And Q is defined as: p x U_infinite x A_d. (p: density of air, A_d: Area of disc) I cannot understand the reason of taking the area of disc, A_d...

Hi, Like many here I watched Veritasium's awesome videos on this*. And like many I found myself having to drag my mind into understanding why it works. The energy explanation makes the most sense to me. Derek explains that the fan is taking energy out of the existing wind - slowing it down -...

Hi all. I'm new to this forum and to wind turbine technology in general, and I watched one of these one-minute videos explaining why wind turbines pitch their blades but it doesn not make sense to me. Why don't you just get a bigger generator? You'd get more energy for the same blades, same...

Hi, I'm currently in High school so I'm uncertain whether this could be feasibly possible. I read on another thread that Wind Turbine's produce too much drag to actually be beneficial to your car and energy. BUT, they all discussed the wind turbine being on the top of the car. I was thinking...

Homework Statement Choose one form of electrical generation and in point form outline the process through which electricity is generated and the energy transformations that occur. Homework Equations NA The Attempt at a Solution Hi, I am done my work and I used two reliable sources. This...

Could multiple, smaller rotors on a wind turbine (on the same shaft) be more effective than a single, larger rotor? Why do most wind turbines have only one big rotor? I was thinking about doing a science fair project on this topic, but I have been unable to find a conclusive answer to this...

Which will be my reference frame while modelling and control - the reference machine in the network or the network bus itself?And if so how do i relate the dfig to this reference frame?

< Mentor Note -- thread moved to HH from the technical Engineering forums, so no HH Template is shown > Okay so I'm a freshman BE student and one of our first projects is designing a windmill that can produce a voltage of 5 for 2 seconds or longer. We are having trouble find the optimal gear...

Sounds pretty good: http://www.theverge.com/2015/5/16/8615089/vortex-bladeless-wind-turbines-shake-to-generate-electricity I like this particular idea a lot. With no blades, these take up much less space, and the claims about them being 50% less expensive to make, and lower maintenance, seems...

Here is something I read on a Wiki article: "Scientists are investigating ways to harness the wind energy within the jet stream. According to one estimate, of the potential wind energy in the jet stream, only 1 percent would be needed to meet the world's current energy needs. The required...

Hello all, this is my first time posting here so please excuse if this maybe isn't the appropriate thread to post this in but I figured it may be the most relevant. I am working on writing a proposal (small, just 450 words), that aims to address the energy efficiency of a university, ie...

I'm attempting to design a turbine for a small scale solar updraft tower. It produces between 1-3 m/s of air flow in a 0.3m diameter tower. I'm in need of resources that can guide me on designing the turbine fan. I've already got the Wind Energy Handbook, however I'm not even sure if following...

I have just begun my power electronics class, but have already seen what an inverter is. My question is: is there a difference between the topologies that function with photovoltaic systems and wind energy ones? Thankyou

I'm in the final year of my bs. in mechanical engineering.For my senior project , I would like to conduct a study on the feasibility of harnessing wind energy for electricity in my country (I don't think it has been done here before and we have a power problem and a pollution problem). My...

Hello, I am doing research on on wind turbines and especially on offshore wind turbines for my MSc dissertation. My first degree is on electrical engineering so I have a basic knowledge on the matter I believe. I am looking for some books that can provide an in depth analysis on the...

Ok not a great title, but let me try to explain the idea. Imagine that you have say a parachute attached to the top of a flag pole. In the center of the parachute a hole is cut and connected to a plastic tube that goes to the ground. When the wind comes up the parachute exerts a drag on the...

Hi, I'm having a little bit of trouble. I need to work out the amount of energy the wind provides at an average speed of 2.67m/s when the blades of a turbine are 0.5m in length? Also how would I use this energy in order to calculate the size of a reciporacting pump needed to pump a head of water...

http://www.cnn.com/2009/TECH/science/06/16/high-altitude.wind.power/index.html Basically two designs, one a helium-filled turbine. The other would be a kite that goes up and down. Is this feasible? I see a major issue being the weight of cable that the device would need to support.

http://bash.org/?131553 lol :D

There is a lot of talk about big projects to gather energy from wind. I have two ideas I don't see used that I was wondering about. 1. Using large stretches of canvas to redirect wind from a large cross sectional area to a smaller outlet, like some kind of wind nozzle. It would also form...

I must construct a car which is propelled solely by wind energy. The car should be able to drive straight into the wind. Have you got any ideas?