COOL INNOVATION GENERATING WATER FROM AIR:-
How cool would it be if there was a machine which could generated water from air.There in a machine developed which converts the humidity air consists into water.
An atmospheric water generator (AWG) is a device that extracts water from humid ambient air. Water vapor in the air is condensed by cooling the air below its dew point, exposing the air to desiccants, or pressurizing the air. Unlike a dehumidifier, an AWG is designed to render the water potable.
AWGs are useful where pure drinking water is difficult or impossible to
obtain, because there is almost always a small amount of water in the
air that can be extracted. The two primary techniques in use are cooling
and desiccants.The extraction of atmospheric water may not be free of cost, because significant input of energy is required to drive some AWG processes. Certain traditional AWG methods are completely passive, relying on natural temperature differences, and requiring no external energy source. Research has also developed AWG technologies to produce useful yields of water at a reduced (but non-zero) energy cost.
So here the question arises, where could this technology be used-everywhere but mainly it would be huge relief to the places where water is the huge problem in livlihood.
HOW DOES IT WORK?
Mainly there are two types of technology used to produce water from air:
1.cooling condensation
2.wet desiccation
process is mentioned below:-
1.Cooling condensation
Example of cooling-condensation process.
The rate at which water can be produced depends on relative humidity and ambient air temperature and size of the compressor. Atmospheric water generators become more effective as relative humidity and air temperature increase. As a rule of thumb, cooling condensation atmospheric water generators do not work efficiently when the temperature falls below 18.3°C (65°F) or the relative humidity drops below 30%. This means they are relatively inefficient when located inside air-conditioned offices. The cost-effectiveness of an AWG depends on the capacity of the machine, local humidity and temperature conditions and the cost to power the unit.
New emerging technology utilize the Peltier effect of semi-conducting materials in which one side of the semi-conducting material heats while the other side cools. In this application, air is forced over the cooling fins on the side that cools which lowers the temperature of the air to its dew point, causing water to condense. The resulting water is then collected. Due to the solid-state nature of the semi-conducting material and the lower power usage, some of these new designs use solar energy panels as the power source[citation needed].
The drinking water generation capacity can be enhanced in low humidity ambient air conditions, first by using the evaporative cooler with a brackish water supply to increase the air humidity near to dew point condition. Thus drinking water is generated using brackish water without depending on ambient air humidity by the water generator.
2.Wet desiccation
One form of wet desiccant water generation involves the use of salt in a concentrated brine solution to absorb the ambient humidity. These systems then extract the water from the solution and purify it for consumption. A version of this technology was developed as portable devices which run on generators. Large versions, mounted on trailers, are said to produce up to 1,200 US gallons (4,500 l) of water per day, at a ratio of up to 5 gallons of water per gallon of fuel.[5] This technology was contracted for use by the US Army and the US Navy from Terralab[citation needed] and the Federal Emergency Management Agency (FEMA).[6]A variation of this technology has been developed to be more environmentally friendly, primarily through the use of passive solar energy and gravity. Brine is streamed down the outside of towers, where it absorbs water from the air. The brine then enters a chamber and subjected to a partial vacuum and heated. The water vapor is collected and condensed, while the renewed brine is recirculated through the system. As the condensed water is removed from the system using gravity, it creates the vacuum which lowers the boiling point of the brine.[7]
Prototype systems combining adsorption, refrigeration and condensation are also being developed.[8][9]
AREAS IT COULD BE UTILIZED:-
1.HOME:-
Houses has a limited need of water in their daily basis.Places where water is a problem in availability,this machine could be used as an alternative.Home size machine of it can produce upto 32 litres of water in a day according to the humidity in the area.
2. For offices/restaurants:-
Use of water is very high in amount in the places like office and restaurants where there is a huge crowd. So,this machine can help in producing water through air, saving money.
3.Deserted areas:-
The main relief is for the people who face difficulty in survival in deserted area where water scarcity kills habitats and people have to suffer a lot like:- they have to travel for miles for some litres of water which is also to be precisely used.
The machine like these if built in a huge format these sort of cities can have there life-"water" sufficiently.
