🔍 Key Concepts

• Flash type distilling unit operation (how flashing depends on pressure and temperature difference) • Effect of sea water temperature on condenser performance and vacuum • Relationship between vacuum level and amount of flash steam produced

💭 Think About

• How does colder sea water change the performance of the condenser and the pressure in the evaporator shell? • If the vacuum improves, what happens to the boiling point of water and the ability of feedwater to flash into steam? • Which options would actually increase efficiency (more distillate per unit of heating steam) versus reduce it?

✅ Before You Answer

• Identify which choice directly involves vacuum and think about how vacuum affects boiling point and flashing • Eliminate any option where a change would obviously reduce the production of flash steam or heat transfer efficiency • Consider that cooler sea water usually makes the condenser work better, not worse—how would that influence the distilling unit’s overall efficiency?