Breakthrougth cheap water desalination

Breakthrough cheap water desalination

Author: Judbarovski David, system engineering, principle inventor 
judbarovski@gmail.com

Note: Referring to my archive of several decades of work, being constantly upgraded and updated, I can declare that solar and wind energy can be USD 0.01//kWh, even several times cheaper (as heat as electricity), even if at engineering level of past ages.

It can be pairs of small mirrors of about 1.0 m2 each and made of plastic foils and thin iron strings and sheets, and totally USD 15.0  

The first mirror is planar and redirecting the solar beams onto the second mirror being a solar beams concentrator and can be motionless with motionless solar spot in its focus, so being reliable in operation. For southern regions it is about 3 m2 plant area per kW.

Technology of the water desalination by series of evaporators/condensers (EC-s) is well known. Vapor of previous EC is evaporating the treated water by its heat of condensation.

In our case of solar desalination, because solar heat is quite volatile, the EC-s have to be quite small for more quick evaporation/condensation process and designed to quicker and more simple periodical cleaning, while the said series inlet flow velocity is only control factor.

If heat loses in EV to be supposed 12.5% and seven EC-s in each series, so 

N = (1- 0.875^8) / 0.125 = 5.25

If 2000 kWh/m2 solar heat per a year,

(5.25 + 1) * 2 * 3.6 / ((40.66 kJ/g) / 18) ~ 15 m3 desalinated water, or 75 m3 in 5 years payback, so USD 15 0/75 m3 = 20 cent/m3 + 20% for others being relatively negligible = 24 cent per m3.