Technology

RN Solutions uses membrane distillation technology. Our working principle is based on Air or Liquid Gap Membrane Distillation (AGMD) and Direct Contact Membrane Distillation (DCMD).

Air or liquide gap membrane distillation [AGMD]

Membrane distillation filtration
Cold sea water flows into the inlet of the Membrane Hybrid Unit (MHU) passing the heat exchanger channel. On the other inlet warm seawater enters the same unit passing the membrane channel. In the MHU an almost counter-current flow process and a high recovery of evaporation heat is possible.
In Air Gap Membrane Distillation (AGMD), water vapour is condensed on a cold surface that has been separated from the membrane through an air gap. The heat losses are reduced in this configuration by addition of a stagnant air gap between membrane and condensation surface.
The warm distillate cools down due to preheating the seawater. AGMD is high energy efficient and suitable for heat recovery.

Heat exchanger Industrial waste heat (HU-01)
The warmed up seawater needs to be heated a little bit more to create the temperature difference in the filter unit. For instance, (industrial) waste heat ( < 90° C) can be used for reheating the seawater to the required temperature.

Brine or concentrate
When this process takes place continuously, you will get a seasalt concentrate (brine) on the warm seawater side of the unit. This can be easily removed from the system and applied for other purposes.

High optimal energetic system
The ultimate goal of our high optimal energetic system is to produce water which can be used for making drinking water. To create this water, only a temperature difference is required of about 3° C. The higher the temperature difference, the higher the flux will be.

Direct contact membrane distillation [DCMD]

Membrane distillation filtration
Cold water flows into the inlet of the rectangular unit passing the membrane distillation filter unit (MU). On the other inlet warm seawater enters the same unit. This creates a temperature difference across the membrane.
Due to laws of physics a balance will want to develop. Warm water wants to flow towards the colder water, but cannot pass the membrane. Only water vapor passes through the membrane and condensates on the cold side.

Heat exchanger
To continue this water production process, we create a constant temperature difference on both sides of the membrane by entering the distillate flow into our heat exchanger unit (HU).
Our heat exchanger unit consists of a foil in the middle. On one side of the foil we let cold seawater flow through the unit. On the other side the warm distillate passes through. Due to the temperature difference, the distillate releases its heat through the foil to the cold side of the unit increasing the temperature of the seawater.

Industrial waste heat
The distillate cools down and is reused in the membrane distillation unit. The warmed up seawater needs to be heated a little bit more to create the temperature difference in the filter unit. For instance, (industrial) waste heat (< 90° C) can be used for reheating the seawater to the required temperature.

Brine or concentrate
When this process takes place continuously, you will get a seasalt concentrate (brine) on the warm seawater side of the unit. This can be easily removed from the system and applied for other purposes.

High optimal energetic system
The ultimate goal of our high optimal energetic system is to produce water which can be used for making drinking water. To create this water, only a temperature difference is required of about 3° C. The higher the temperature difference, the higher the flux will be.