–In a country or the response to a need crucial does not exist, this answer can have an exorbitant price.

revenge, in a country where this one exists and is exploited, it can, so to be developed.

can be a starting point.

to have costs minima, It is necessary to reduce to the maximum the number of intermediaries between the study realization of the prototype and the exploitation by the final customer.

your product has of potential in the short run less you need investor and more financial potentials come to be grafted on the project and of as much, by action leverage, It is possible for you to obtain funds.

revenge, plus a project has a return on long-term investment, less the investors are interested, and more it is necessary to lock its management and to invest to make succeed the project.

The average price in France of m3 of water: (January 2004) 2,44€ (16F) the Cubic meter water.

And considering that the systems with photovoltaic energy having one lifespan 25 years, that can help us to determine to determine the cost price of the installation.

 

–Market concerned  (bond)

–Réponse au marché: plusieurs procédés:

• •Vegetation for arid ground, answering a durable development

  Balance between the cycle of evaporation and the cycle of condensation:

  To plant special trees "arid grounds"

  the argan

  –  

   The Shea tree

  

  The Arabic acacia

• Sensor of fog (to see site: method théodosia )(to also see site:ecotour the 2004 Year green of the ground ).

• Under the influence of the wind, the droplets of moisture are imprisoned by a net:

• Principle of the desalination of sea water by mechanical vapor compression

Thermal process of desalination with high output  (thank you At the team school EDC and Laurence Pannetier, centre de ressources technologiques INNOTECH))

• By distillation, with a source of traditional energy,

   (to see site:Eduscol Culture sciences-chimie ))

  

  –Brackish water is heated, transformed into vapor, then condensed to recover only distilled water,

   or with solar energy. (to see site:Solar distillation)

–

Brackish water is heated by solar radiation, transformed into water vapor, then condensed on the higher walls to be to recover in the central container. It is distilled water.

"AKA Vapor Still" is a small inflatable solar distiller

 

• •By Electrodialysis (to see site : Eduscol Culture sciences-chimie )

  –

  Remove water from the ions sodium in the substitutes by ions chloride thanks to an electric field

   between which passes brackish water.

• •By opposite osmosis (to see site : Eduscol Culture sciences-chimie )

  it is a principle making it possible to filter the impurities and to let pass only water.

• •process under study:

  by congelation which consists in freezing sea water, to clean the ice of the brine, then to defrost it.

  Conclusions:

   

  • Broadly these processes have needs:

  - a provision of brackish water (except the net with fog)

  - of energy (all, the net with fog with need for wind and a unevenness)

  - Of a control of the advanced technologies (except the net with fog)

  -  of a regular maintenance day labourer.

  A problem in the psychological approach:

  - To drink a "stagnated water residue ". (except the net with fog)

• –When nobody any more lives in these arid regions or when there is no more arid region (not very probable)

• When it starts to rain in these zones and that infrastructures will make it possible to manage this water.(in the short run not very probable)

•  In the arid countries, the quantities of evaporated water are higher than the quantities of condensate:

  • Will the need disappear when there are a balance (or one exceeding) between the cycle of condensation and the cycle of evaporation (probable in the medium term)

  • When certain rich countries will have found the means of benefitting from certain natural resources of the countries considered without impoverishing the autochtones or while enabling them to have a being equivalent index of growth (index adapted to the need for the country in the process of development). (probable in the medium term)

   

• In conclusion,

  • •When the world economic policy has a management total of the needs

  • and can make the difference between a need and a desire,

  • When the human one controls the climate,

  • the need can be reduced (possible in the medium term)

  •

  Conclusion, à moyen terme:

  Conclusion, in the medium term:

   The need exists!

• –Its principal function will be to condense the water vapor of the water air to allow its exploitation of it.

• Must have the minimum of maintenance and human intervention.

• It must use renewable energy to the maximum of its possibilities while optimizing its energetic efficiency.

   

• Note::

  It will be useful to quantify the atmospheric disturbances of with the rejection of pressure partial of air lower than the atmospheric pressure