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Discussion

Cogeneration is attractive where a site has

  • A.a substantial and steady demand for both heat and power
  • B.a demand for power alone throughout the year
  • C.a demand for heat alone at low temperature
  • D.an intermittent demand for power at high voltage

Answer: A

Correct answer: a substantial and steady demand for both heat and power

Cogeneration earns its return by using the heat rejected from generating power, so it needs a real and continuous use for that heat. A site wanting power alone must dump the heat and gains nothing, and a site wanting heat alone is better served by a boiler. The steadiness matters as much as the size, since a plant sized for a peak and run at part load rarely pays back.

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