In which of the following fresh water...

🔍 Key Concepts

• Purpose of an air ejector in an evaporator-type fresh water generator • Difference between vacuum (evaporation) systems and pressure (membrane) systems for fresh water production • Which types of generators rely on boiling/evaporation under vacuum versus those that force water through a semi‑permeable membrane

💭 Think About

• Which units on the list need a vacuum to let water evaporate at a lower temperature? Those units will need an air ejector to maintain that vacuum. • Which option works by pushing seawater through a membrane using high pressure instead of boiling it? A vacuum (and therefore an air ejector) is not needed there. • Look at the names: which ones clearly sound like distillation/evaporation equipment, and which one sounds like a filtration or membrane process?

✅ Before You Answer

• Identify which choices are evaporator/destillation types (these normally need an air ejector). • Identify which choice is a membrane/filtration type that works on pressure rather than vacuum. • Before picking, ask: "Does this design need vacuum for operation?" If no, then an air ejector is unnecessary.

In which of the following fresh water generators would an air ejector be unnecessary?

Submerged tube unit

Reverse osmosis unit

Flash type unit

Titanium plate unit