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As industry looks harder at energy conservation, more users of process steam are rediscovering the benefits of induction generators to produce "free" electric power from process energy that would otherwise be wasted. A typical 450-kW turbine-generator set can pay for itself within 11/2 years, while reducing a plant's total electrical demand from the utility by 15 percent. Load is regulated simply by varying prime mover speed; voltage and frequency are controlled entirely by the connected utility system. The operating principles, control requirements, and performance features of induction generators in cogeneration/waste heat applications are outlined. An example from a manufacturing industry will illustrate the economic advantages.
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R.L. Nailen (1983) studied this question.
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