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##
Optimized Blade Design for Homemade Windmills
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Revision as of 19:33, 30 January 2011

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−{{Statusboxtop}} {{Template:Status-Design}} {{Template:Status-Model}} You can help Appropedia by contributing to the next step in this [[OSAT]]'s [[:Category:Status]] {{boxbottom}}

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+You can help Appropedia by contributing to the next step in this [[OSAT]]'s [[:Category:Status]]

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=== <br>'''Maximum Possible Efficiency''' ===

=== <br>'''Maximum Possible Efficiency''' ===

−<br>The [http://en.wikipedia.org/wiki/Betz'_law#Three_independent_discoveries_of_the_turbine_efficiency_limit, ~~Betz ~~limit] was developed by Albert ~~Betz ~~and is intended to represent the maximum possible energy that a device can derive from a stream of fluid at a given speed. In the case of windmill, the maximum theoretical efficiency of a thin rotor can be found based on the following assumptions:

+<br>The [http://en.wikipedia.org/wiki/Betz'_law#Three_independent_discoveries_of_the_turbine_efficiency_limit, Benz limit] was developed by Albert Benz and is intended to represent the maximum possible energy that a device can derive from a stream of fluid at a given speed. In the case of windmill, the maximum theoretical efficiency of a thin rotor can be found based on the following assumptions:

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−The ~~Betz ~~limit has predicted the theoretical maximum value for the power coefficient to be 0.593. This means that the theoretical limit of power removed from the fluid is 59.3%. In comparison, commercial wind turbines are currently able to achieve 40 - 50% conversion due to slight inefficiencies related to the blade design and mechanical process.<ref>Gorlov A.M., Silantyev V.M., Limits of the Turbine Efficiency for Free Fluid Flow, Journal of Energy Resources Technology - December 2001 - Volume 123, Issue 4, pp. 311-317.</ref>

+The Benz limit has predicted the theoretical maximum value for the power coefficient to be 0.593. This means that the theoretical limit of power removed from the fluid is 59.3%. In comparison, commercial wind turbines are currently able to achieve 40 - 50% conversion due to slight inefficiencies related to the blade design and mechanical process.<ref>Gorlov A.M., Silantyev V.M., Limits of the Turbine Efficiency for Free Fluid Flow, Journal of Energy Resources Technology - December 2001 - Volume 123, Issue 4, pp. 311-317.</ref>

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=== <br>'''Optimal Angle of blades''' ===

=== <br>'''Optimal Angle of blades''' ===

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−[[Image:Blade Angle cos cos sin.jpg|left|470x274px~~|Blade Angle cos cos sin.jpg~~]]

+[[Image:Blade Angle cos cos sin.jpg|left|470x274px]]

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= References =

= References =

236

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