Talk:Rębielice Królewskie Wind Turbine

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Energy Low‑importance

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Untitled[edit]

The energy production claim on this page for 2m/s is not consistent with the stated rotor size (and basic physics). One or the other must be wrong:

Quoting JSHarris from: http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=7778&page=1#Item_5

The theoretical power in the air mass flowing through a 33m diameter disc is:

Swept area = 16.5² x pi = 855m²

Power in the wind at 2m/S (ignoring Betz limit) = 0.5 x rho x A x V³ = 0.5 x 1.225 x 855 x 2³ = 4.189kW

Assuming machine is capable of operating at the Betz limit of 59.3% efficiency, then the mechanical power extracted from the wind to the generator shaft will be:

4.189kW x 0.593 = 2.484kW

Assuming a generator efficiency of 90%, then the electrical power delivered by the unit at 2mS wind speed would be:

2.484 x 0.9 = 2.236kW

How come they claim 35kW at 2m/S from this machine?

i — Preceding unsigned comment added by 81.98.240.75 (talk) 21:29, 5 September 2011 (UTC)[reply]

Compare with other turbines! --House1630 (talk) 21:04, 3 October 2012 (UTC)[reply]