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Page updated: 24.06.2008
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Most frequently asked questions:
*** Question: *** In various sources of the information upon windenergetic is spoken
about theoretically greatest possible factor of transformation of the wind power, equal 59,3 %. In your article you specify
number 68,6 of %, whence it and where to this a substantiation?
The answer: Value of 59,3 % is result of the theory of wind engines which had offered A. Betz in the twentieth years
of the last century. Basic conclusions of this theory are used till now. However, the Soviet scientist – professor G.Sabinin (the pupil of
professor N.Zhukovsky) in 1931 had offered more exact theory in which had proved presence of so-called «the attached mass». This theory
increases the mentioned above value up to 68,6 %. I managed to adapt the theory and formulas of G.Sabinin for modern
opportunities. I offer the calculations corresponding to his more exact theory. For those who wants to find the primary source:
G.Sabinin, “The theory and aerodynamic calculation of wind engines”, collection BCHX the USSR “Works of scientific research institutes of
the industry” № 482, the Central Aero-Hydrodynamical Institute, Release 104. Theme – the Problem of use of a wind power. The state
scientific and technical publishing house, Moscow, Leningrad, 1931, 70 pages. In the original in Russian (code: windows-1251):
* Г. Х. Сабинин, «Теория и аэродинамический расчёт ветряных двигателей», сборник ВСНХ СССР «Труды научно-исследовательских
институтов промышленности » № 482, Центральный Аэро-Гидродинамический Институт (ЦАГИ), Выпуск 104. Тема – Проблема
использования энергии ветра. Государственное научно-техническое издательство, Москва, Ленинград, 1931, 70 страниц. *
*** Question: *** In the aerodynamic calculations suggested by you there is a
parameter "A". What does it mean and whence the formula of calculation of parameter "e" is taken?
The answer: The parameter "A" is auxiliary. It groups all combinations of use of parameter "e" in the
formula b = f (Cy, Cx, Zu, e, i, r), where b – width of an element of the blade; Cy, Cx, Zu, e – aerodynamic parameters; i – quantity
of blades; r - distance of an element of the blade from the center. In calculations it is more convenient to find A = f (Cy, Cx, Zu, i, b,
r), and then to find е = f (А). The equation А = е/(1+е)/(1-е)2 will be transformed in е3 – е2 –
(1 + 1/А)е + 1 = 0 and is solved with use of the formula Cardano (it is specified in mathematical directories). Result of the decision is the
formula in cells "e" in calculations applied to article.
*** Question: *** I live in district with the big wind activity and I plan to mount own
small wind turbine. Whether I can take advantage of your calculations for definition of its efficiency?
The answer: Yes. For this purpose it is necessary for you to learn (for example, on the nearest meteorological station) the wind
characteristic of your district (mid-annual wind speed and parameter Weibull K), and also parameters of concrete wind turbine to
substitute them in the calculation table and to count up annual gathering of the received energy. Accuracy of calculation depends on
conformity entrance data to real values. Knowing cost of wind turbine and term of its service it is possible to count up cost of each
received watt. After these calculations it is possible to argue about efficiency of your wind turbine. At experiments with Excel table
remember, at some your actions, option of cyclic references of Excel table can be changed. For reconstruction of this option it is
necessary to open the table, to press "service" in a line of the menu, then to find and press "parameters", to find and press "calculations".
In this window switch on "iterations", fill values "limiting number of iterations" 100 and accuracy – 0,000001.
*** Question: *** Whether company Izosimov Windrotor of the sponsor has?
The answer: Izosimov Windrotor (windrotor.info) company is independent of external programs, has no external
financing and carries out researches, calculations, patenting, licensing and other activity for own money. We can interest potential sponsors or their advertising on this website, or preferential licensing of idea offered on a website (after reception of the patent). Other variants are possible also.
*** Question: *** Whether the partner program with other websites interests the
author of your website?
The answer: Yes. I would like that on other websites which represented windenergetic and on websites which represented
nonconventional and renewed energy sources there were references to this website. It can be references
on pages of "links" and/or in messages (it is desirable with the resume) on pages of news. In exchange I could add references about
these websites on the own page "links", and probably to place banners. The page of news on this website is not planned.
At occurrence of questions and offers please address through contact page of a website.
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