Answers: 3
(Eq. 1)
- Efficiency of fan, dimensionless. 
- Electric power supplied fan, measured in watts.
- Rate of change of kinetic energy of air in time, measured in watts.
(Eq. 2)
- Density of air, measured in kilograms per cubic meter.
- Volume flow, measured in cubic meters per second. 
- Cross-sectional area of fan, measured in square meters.
, 
, 
and 
, the power needed to be supplied by the fan is:![\dot K = \left[\frac{\left(1.20\,\frac{kg}{m^{3}} \right)\cdot \left(0.05\,\frac{m^{3}}{s} \right)}{2\cdot (0.3)} \right]\cdot \left(\frac{0.05\,\frac{m^{3}}{s} }{20\times 10^{-4}\,m^{2}} \right)^{2}](/tpl/images/0832/0462/e3401.png)
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Determine the power that needs to besupplied by the fanifthe desired velocity is 0.05 m3/s and the c...
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