Class 4 (4th Engineer) MEKG 📅 May 2023

Exam Question

(a) Explain with the help of a line diagram the working principle and construction of a 'plate type freshwater generator'. (10)

(b) Name the materials used for various components of the FWG and why the plates of the heat exchanger and condenser corrugated (6)

Reference Answer

### (a) Working Principle and Construction of a Plate Type Freshwater Generator
#### 1. Principle of Operation
The plate type freshwater generator operates on the principle of vacuum distillation. Seawater is boiled at a low temperature (approximately 40-60°C) by maintaining a high vacuum inside the generator shell. This low-temperature boiling prevents the formation of hard scale that would occur at higher temperatures.
- **Vacuum Creation**: A high vacuum (approx. 92-96% or an absolute pressure of 0.08-0.04 bar) is created and maintained within the generator shell by a seawater-driven air/brine ejector.

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