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11
Economic Use of Power
The economical use of power in this chapter means doing the same required work
with a minimum expense of energy. In land-based or shipboard power systems,
major opportunities in energy savings come from:
Using a high efciency motor that runs several hours every day over the year
Improving the power factor of the equipment or the entire plant to bring it close
to unity
Using a variable-frequency drive to match the motor speed with the load
requirement
Storing energy when it is available at a lower cost and using it later when it has
higher value
Converting the kinetic energy of a moving mass into e ...