web application

WEB application for designing a flying wind turbine in a modular enornis scheme.

Capabilities:

  • theoretical estimation of the power of a flying wind generator;
  • calculation of power losses in the cable and the weight of the cable.

This product will be useful both for engineers interested in the topic of flying wind generators, so for investors assessing the profitability of the projects.



The choice of flight altitude affects the density of air.

It should be remembered that the cable is longer than the altitude of the flight.

By the way, the height of the column of the largest stationary wind turbine is 135 m.
Hg = 100 м

Wind speed can be set either yourself, or using the service Earth. In this service, the value of the wind speed can be determined from the location, time and altitude coordinates. Unfortunately, the speed value is known only for several levels of heights and the intermediate values are determined by the approximation yourself. The selected height is determined by the pressure level, according to the following table:
SFC - 0м
1000 hPa - 100 m
850 hPa - 1500 m
700 hPa - 3500 m
500 hPa - 5000 m
250 hPa - 10500 m
Go to the Earth service
V=5 m/s

Minimum diameter 0.3 m
Maximum diameter 5 m
Scale step 0.1 m
The outer diameter is not less than the inner diameter.

By the way, the external diameter of the largest stationary wind generator E-126 127m
D1 = 1 m

D2 = 0.1 m

0.777 m2

1.23 kg/m3

Cp = 0.35

Ng=0.8

16.67 W



Transmission of energy by electric wire

The most obvious scheme is the transfer of energy from AWE-generator to the ground - by electric cable. Solving the problem, so to speak, "in the forehead" led several companies to deplorable results.
The first failed was Magenn, the financial director committed suicide.
Another project that took over the base electrical transmission of energy Altaeros, convinced investors re-invest for use   developments in another sphere.
The essence of the problem is the energy losses in the wires and the weight of the cable, based on the maximum possible energy transfer. Also a large mass has a generator. And, of course, the eternal dead-end path in games with nature is a large power per unit of device.

Engineers, in order not to go on the wrong path, important are not beautiful legends, but understanding of the figures hiding behind the problem.




Name
of material
Resistivity,
Ohm * mm2 / m
Density,
kg / m3
Preis,
$/t
Copper 0,0178 2700 8500
Aluminum 0,028 8900 2500

For the "flying cable" it is necessary to operate with the reduced value of the density of the resistivity.

Name
of material
The reduced resistivity,
(Ohm * mm2 / m) * (kg / m3)
Copper 158,42
Aluminum 75,6

It turns out that aluminum wins 2 times . So aluminum again becomes preferable when used for aircraft, as in aircraft building.



The alternating current is convenient for conversion (with the help of a transformer), but is less efficient in transmission, and therefore with the same efficiency for it is possible to use a conductor of lower mass. When transferring a large amount of energy with a large voltage over long distances In the form of alternating current, the effect of the reactive resistance of the conductor becomes noticeable.

For AWE distances of of 1 km or less such an influence should not be large. Another issue is isolation. To minimize cable weight, the insulation must be the minimum. The thickness of the insulation is determined by the voltage between the adjacent wires. Moreover, for an alternating current one must consider the amplitude the value of the voltage, and it, as is known, for a sinusoidal current generated by generators, by 1.4 times greater than the current (for example, in the household network 220 V and 311 V, respectively). Also 1.4 times less can be made the thickness of insulation for a conductor with a direct current.

Another advantage of direct current at the output of the AWE generator is the ease of combining many small AWE generators into a single network without the need for phase matching. But that is another story.


Alf = 30 Grad

200 m

400 m

Sc = 0.5 mm2

re=0.028 Ohm * mm2 / m

22.40 Ohm

U = 220 V

0.08 А

1.79 V (0 %))

218.21 В

0.14 Вт (0 %)

rm=2700 kg / m3

0.54 kg

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