Humidification-dehumidification (HDH) desalination system is a carrier-gas based thermal technique that can be used for small-scale water. Water and energy are two of the most important topics on the international environment and development agenda. The social and economic health of the. The object of this research is to investigate experimentally the principal parameters concerning a system for water desalination by air.


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The system is based on an open humidification dehumidification air cycle. The effect of operating parameters on the system characteristics has been controlled, measured and investigated.

Water Desalination using Solar Energy: Humidification and Dehumidification Principle

It was found that the hot inlet water temperature to the humidifier has a significant impact on the water productivity ; they are relatively proportional, humidification dehumidification, the more the hot inlet water temperature increases, the more the water productivity increases. It was also found that Saline water flow rate has an impact on the water productivity but inversely proportional.

Water use has yet to adapt to the realities humidification dehumidification scarcity, with much action that could be taken in water conservation and water re-use. The health of river systems is threatened by overuse and pollution.

HDH Desalination | Lienhard Research Group

Rivers are often no longer able to provide the volumes of purified water needed with the increasing impact of pests and diseases. With the introduction of powerful pumping from deep underground and piping across long distancesgroundwater aquifers are increasingly being depleted well beyond sustainable recovery levels; this also has lead in many cases to brackish water with high concentrations of dangerous minerals and resulting in health problems as well.

Desalination has become a major new source of fresh water, tapping into the vast reserves of seawater and brackish water. It is especially useful where water conservation and water humidification dehumidification either have limited potential or face major problems of implementation humidification dehumidification 1 ].

Desalination processes Desalination of seawater or brackish water is generally performed by either of two main processes; by evaporation of water or by use of a membrane to separate fresh water from a concentrate.

In the phasechange or thermal processes, the distillation of seawater is achieved by utilizing a thermal energy source.

Solar humidification - Wikipedia

The thermal energy source might humidification dehumidification obtained from a conventional fossil-fuel, nuclear, or from a renewable resource, like solar energy or geothermal energy. In the membrane processes, electricity is used either for driving high pressure pumps or for establishing electric fields to separate the ions.

The most important commercial desalination processes based on thermal energy are multistage flash MSF humidification dehumidification, multiple effect distillation MED and vapor compression VCin which compression may be accomplished thermally TVC or mechanically MVC [ 2 ]. Fortunately, there are many parts of the world that have exploitable renewable sources of energy that could be used to drive desalination processes.

Thus, desalination processes by using solar radiation; solar desalination processes are promising alternatives that can partially support human needs for fresh water, using an environmentally friendly energy source. This would be especially important for tribes or small groups inhabiting remote areas.


Solar desalination requires an efficient method of evaporation and condensation at relatively low temperatures. Therefore, the most promising development in solar humidification dehumidification to enhance productivity efficiency is the use humidification dehumidification the humidification and dehumidification principle.

Combining the principle of humidification-dehumidification with solar desalination appears to be the best method of water desalination with solar energy.

Water Desalination using Solar Energy: Humidification and Dehumidification Principle

Hence, solar desalination offers is considered to be an ecological solution that uses renewable energy efficiently. Humidification dehumidification principle The Humidification Dehumidification HDH process is similar to the natural hydrological process where humidification dehumidification sun heats the ocean, and then the water in the ocean evaporates to form clouds.

Finally, the clouds are condensed and water is obtained as rainfall. The HDH process tends to replicate this natural hydrological cycle.

Solar humidification takes place in every greenhouse. Water evaporates from humidification dehumidification surfaces of soil, water and plants because of thermal input.

In this way the humidification process is naturally integrated within the architecture of the greenhouse.