ZEMCH 2019 International Conference Proceedings April.2020 | Page 404
Figure 2. Photo of the experimental apparatus
3. Results
3.1. Preliminary Research Analysis
Through the analysis of previous studies, it was compared with the MED(Multi‐Effect Distillation)
method which has the principle similar to the seawater desalination system using heat pump and is
shown in Table 1.
Table 1. Comparative analysis of MED and Desalination system using a Heat pump
Method
MED (Muti‐
Effect
Distillation)
Desalination
system uising
Heat Pump
Energy Operating
Temperature
Condensatio
n Process
Thermal
Energy 70℃ Supply Sea
water Large‐Scale
plant
Electrical
Energy 70~80℃ Air Small‐Scale
plant
Scale
3.2 Experiment result
3.1.1. Experiment apparatus analysis
Schematic diagram of the seawater desalination system using a heat pump is shown in Figure 1.
The desalination principle uses condenser heat to produce hot water. After that, fresh water is produced
through heat exchange between the steam generated by applying a vacuum pressure and low
temperature air in the evaporator. A 3‐way valve was installed to produce hot water quickly at the start
of the operation. Hot water below 60℃ is recycled and heated by the condenser heat. Heat exchange
between seawater and heat pump condenser is done indirectly by installing a plate heat exchanger to
prevent problems such as corrosion.
3.1.2. Fluid state analysis inside the device
After 20 minutes of operation, hot water above 60 ℃ is produced and continuously supplied to the heat
393
ZEMCH 2019 International Conference l Seoul, Korea