Here is a a sustainable and useful idea for those living near the sea to use ocean water to get pure water. A clever design by Gabriel Diamanti gives 5 liters of fresh water from salt water. The method is very simple. He built a clay pot, a solar plate to heat and vaporize the salt water for desalination (vaporizing salt water) , a metal base and collecting vessel. Sun heats the salt water and condensation takes place. The water vapor is then collected at the bottom where it is cooler than on the top. This water is pure water and drinkable. Salt and other waste is cleaned out from the top for reuse of the same for more water. Five Liters of water can be collected on a good sunlight day. This idea should be made popular in our country since it is very cheap and effective way of collecting pure water in small scale by villagers. The following links gives you the pictures and the idea of how to build one for yourselves.
For more water related resources check the below websites.
For those students who want to do live projects the below resources gives you more ideas. Check them
Refrigeration by sunlight
Science daily carries a article on how sun’s rays are used for cooling food that is kept in a fridge. The process involves heating water to 200 degrees F and then uses the heat to drive a compressor that lowers the temperature of a refrigerant in the fridge. With very hot climate in India I think this is a good solution of keeping farmers vegetable and fruit crops fresh until they are sold in the market. This method is environment friendly, reduces the usage of electricity to minimum.
I’m hoping that somebody takes this idea to implementation stage. The details about this process can be read at http://www.sciencedaily.com/releases/2010/05/100503111531.htm
The MEDISCO project (Mediterranean food and agriculture industry applications of solar cooling technologies) has built several of these solar refrigeration plants in Mediterranean countries where sunshine is plenty. Engineers are using concentrating collectors to direct the sunlight onto an absorber that heats water. check more details at http://www.medisco.org/about/
A guy named Mike Bodge realized that every second some on twitter is mentioning about what time it is while tweeting something. By mining the time and what is told Bodge developed a clock called Chirp clock that tells you a mini story (a tweet) every minute. With this twist a dumb time clock becomes a story teller of what people are tweeting every second. The time will be displayed based on where you are on the globe and stories or tweets will be running in the background. When you are alone or bored this time piece becomes your story teller every second. Check out this cool idea in action at below links
http://chirpclock.com/# Mike bodge’s link http://bod.ge/
Floating solar grids
While most of the solar energy is generated by panels that are sitting on vast areas of land , water that covers 1/3rd of the planet was lying waste until Solaris a Israel based company came up with an idea of floating solar grids in waste water treatment plants. The idea can be used in other places such as wastewater ponds, sewage treatment pools, dams, and reservoirs also. Solaris came up with this idea by accident. They are trying to solve a problem of concentrated solar panels heating up fast and in order to cool those down they realized the new idea of floating solar grids on the water surface. The water evaporated will cool the grids and also generates electricity while floating on the water surface. It is so beneficial to develop solar systems to be on water than on land since land is not available for huge solar plants to be established while we have vast oceans lying around us. With a combination of ocean thermal energy, solar and wind energy this idea can generate a viable business for enterprising business people. Get to know more from the following links
Liquid electricity A group of scientists came up with storing liquid electrictiy with the help of a bacteria Ralstonia eutropha that is genetically modified to generate electricity fuel and CO2 as byproduct. Learn more from the following links
World is facing a severe water shortage and desalination of sea water is very expensive. Industrial desalination involves huge amount of electricity consumption that makes the business non profitable. If you can solve these problems of purifying sea water cheap or reduce the cost of making solar energy cheap so that it can be used in desalination process of water, you will be solving the most challenging global problems and you can also make money in the process. Here is the challenges we are facing regarding water.
” A cheap way to extract salt from seawater so we can drink it? Several countries are already dealing with the impact of rising populations and shrinking lakes and wells without water. For example, in Amman, Jordan there is scarcity of water. Droughts in China , INDIA, Australia and Ukraine have led to crop failures, rising food prices and dwindling grain stocks.
In the middle of the 20th century, the world had about 4,000 cubic meters of fresh water per person per year, according to DHI Water group http://news.cnet.com/8301-11128_3-9925900-54.html#ixzz1Imw1VSbu . Now we’re close, globally, to 1,000 cubic meters per person per year — and 1,000 cubic meters per person per year is defined as water scarcity.
Since 97 percent of the world’s accessible water is in the ocean, inexpensive green technology like desalination — the process of turning seawater into fresh — would open up vast new sources.
Beef production accounts for 1.3 percent of calories consumed by the global human population, but cattle occupy 60 percent of the agricultural land. It takes 31.5 kilowatt hours and 2,500 gallons of water to produce a pound of meat. Grain for human consumption takes less than a kilowatt-hour and 25 gallons, according to various estimates.”
So now you know the impact you can make if you can find a cheaper way of desalinating sea water or finding a cheaper solar technology to generate enough electricity for all the industrial , agricultural and human use. Try your best and start finding some solutions. Good luck.