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COGAS/CODAG Arrangements & Waste-Heat Recovery

Inside this lesson
  • Distinguish COGAS (combined gas + steam) from CODAG (combined diesel and gas) arrangements
  • Describe how a waste-heat-recovery boiler raises steam from main-engine or gas-turbine exhaust
  • Compute combined-cycle efficiency from a topping and a bottoming cycle efficiency
  • Explain why a combined cycle always beats either cycle alone

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Educational content covering topics typical of a first- and second-year marine engineering / naval architecture curriculum. Not a substitute for accredited coursework, and not suitable for real vessel design, operation, or safety decisions without review by a licensed professional engineer. References to classification societies, SOLAS, or MARPOL are descriptive context only, not compliance guidance.