Multieffect Solar Distillation System Using Decompressed Boiling

1
Multi-effect Solar Distillation System Using
Decompressed Boiling
Yuichi YAMAGUCHI and Haruki SATODepartment of
System Design Engineering, Faculty of Science
and Technology, Keio University
Principle

• Characteristics
• High distillation performance.
• Vaporizing around ambient temperature.
• Heat transfer and distillation occur with small
  temperature-difference. (refer to the graph at
  lower left)
• Practicable for multi-effect still.
• Prevent organic breeding.

• Problems to be solved
• Distillation vessels are expensive.
• Existing heat exchangers are also expensive.
• Mist contamination into distilled water due to
  the bumping boiling.

? Development on High-performance, Low-cost, and
Longer durability for Solar Still
Triple-effect Still
Nominal performance of 100 kgday-1 with the
solar panel of 8 m2 Performance record 120
kgday-1
Temperature difference between evaporator and
condenser in the case of indoor experimental
device using a heater (80W) instead of solar
energy
Double-effect Still
Multi-effect Still
Nominal performance of 20-50 kgday-1. (Now
designing)
Nominal performance of 10 kgday-1 with the solar
panel of 2 m2