I have a Thermo I problem:(adsbygoogle = window.adsbygoogle || []).push({});

Given: 80m diameter wind turbine rotating at 20rpm under steady wind conditions at an average wind velocity of 30kph. The eff of the system is 35%.

Need: Power generated

Assumptions (made by me):delta PE ~0; mass=constant; operating at Steady Sate; T~constant

Now, since the eff is = W/Energy and E=delta U +deltaKE +deltaPE this should reduce to:

Eff=W/deltaKE with my assumptions

deltaKE=1/2 m (V2^2 - V1^2)

I know that V2 should be larger than V1 and p2 should be less than p1 but this is where I get stuck, finding V2.

With T~constant specific enthalpy is 0, and entropy will also be 0......

right?

How about a hint to get me on the right path?

Thanks,

R

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# Homework Help: Power from a wind turbine

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