Thermal analysis for system uses pressurized hot water for seawater desalination (pressurized multistage)

•The system consists of pump, heat exchanger and discharge tank.•The heat adds to pressurized water in form of sensible heat.•Thermal analysis was done to estimate the productivity of the system.•The analysis shows promising energy consumption for each kilogram of fresh water.•The optimum operating is pressure of 30 bar with final stage pressure of 3 bar when system consists of 45 stages.

The present work is a description of a proposed system for seawater desalination. The suggested system operates basically the same as the MSF system operates but uses high pressurized saturated water. The system operating pressure through all stages of the system and the final stage pressure are higher than atmospheric pressure.The system is simple and easy to construct. No need for high operation maintenance or high technical stuff in operation. No need for vacuum pumps because it operates at pressure higher than atmospheric pressure which also makes the system starts to operate fast and easy. The seawater could be with any quality or grade even brackish water could be used so no need for seawater pretreatment. The system could also be run by solar energy through replacing heat exchanger with a solar collector according to operating pressure and assigned saturated temperature. Energy consumption and production cost are promising even if system uses electricity as heat source.