Understanding Rotational Energy of a Fan Impeller

[Turv]

Hi,

I'm trying to understand the rotational energy of a fan impeller.

I understand RE = 1/2Iw^2

So therefore an impellor with an inertia of 50 kg m^2 spinning at 1440 rpm

= 568405 J

my question is does this figure need to be divided by 3600000 J to give Kw hours?

 

[Naty1]

Correct: 1KWH equals 3.6 x 10⁶ joules

 

[astrokreng]

Hello,

Thank you for your question. Your understanding of the equation for rotational energy is correct. However, I would like to clarify that the unit for rotational inertia is typically kg m^2, not just kg.

To answer your question, yes, the figure you calculated for rotational energy would need to be divided by 3600000 J to convert it into kilowatt hours (kWh). This is because kWh is a unit of energy commonly used to measure electricity consumption, and it is equivalent to 3600000 joules (J). So, to convert from joules to kWh, you would divide by 3600000.

I hope this helps clarify your understanding of rotational energy and its conversion to kWh. Let me know if you have any further questions.