Exam Question
What is meant by waste heat recovery for diesel plant? How the total efficiency can be increased? (16)
Class 4 (4th Engineer)
MEKM
📅 Jul 2022
Reference Answer
Waste heat recovery (WHR) for a diesel plant refers to the process of capturing and utilizing the thermal energy that is typically expelled as waste, thereby converting it into a usable form of energy. In a marine diesel plant, a significant portion of the total energy contained within the fuel is not converted into useful mechanical work but is dissipated as heat. A typical breakdown of energy distribution in a marine diesel engine is approximately:
* **~45-50%**: Converted into useful shaft power.
* **~25-30%**: Expelled in exhaust gases.
* **~8-10%**: Removed by HT (High Temperature) Cooling Water system (jacket water).
* **~45-50%**: Converted into useful shaft power.
* **~25-30%**: Expelled in exhaust gases.
* **~8-10%**: Removed by HT (High Temperature) Cooling Water system (jacket water).
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