Pure water from salt water the cheaper way. Refrigerated by sunlight

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/

Save money on mobile use, Water news and 2011 world solar car race

We have different requirements when it comes to Mobile use. Don’t know which Mobile service plans is cheapest for your mobile use? Here is a app for andriod phones to know which plan is best for your kind of usage. click here to download the app.


Planhound app secured third position in NASSCOM emerge contest. Click here to know more



In case you are using other kind of phones then click here to know which mobile plan suits your requirement.  http://www.3gsimplified.com/search/index


Water news

We are facing sever shortage of water and it could become worse as the days pass by. Fresh water resources such as lakes, rivers etc are polluted more and more by humans and industrial wastes that are allowed into them. The only alternate for abundant water is oceans. But separating salt and other chemicals from ocean water is very expensive and there is lot of research going on to reduce the cost of extracting pure water from oceans.

Reverse osmosis is the process of getting clean water from ocean is widely used method in the world. But it is expensive and extensive research to reduce the cost has reached their limits as per a report in science magazine. http://www.sciencemag.org/content/333/6043/712

A team from Yale university are trying to change entire process, by making a series of membranes for the pre- and post-treatment stages of desalination. Click here to read more about this research.  http://opac.yale.edu/news/article.aspx?id=8775

If any of us come out with a cheap method of cleaning ocean water we could solve water crises not only for India but to many parts of the world. Israel is the country which pioneered water purification process so much and they are world leaders in preservation of water. Recently they built another purification plant at a cost of $423 million. Read more here.  http://planetark.org/enviro-news/item/62884

2011 World Solar Challenge

This year’s World Solar car racing Challenge 2011 Darwin to Adelaide is the largest  and the stage is set for an adventure of epic proportions, contested by 21 countries. It’s a 1,800-mile solar car race through the Australian outback. Participants this year come from the U.S., UK, China, India, Japan, Saudi Arabia and more, to race their often student-designed solar car prototypes, each vying for their moment in the sun. The race stretches from Darwin to Adelaide, and according to the rules of the race, this distance must be cleared with at least 90 percent of the cars’ energy coming from the sun. More can be read here http://www.worldsolarchallenge.org/news_and_information

Some of the competitor details can be obtained here






Delhi Technological University’s Avenir is India’s contender in the race this year. It runs on a lithium phosphate battery, and has a cruising speed of 40 mph and a max speed of 52 mph. The team’s big sponsors this year include IndianOil and IndoSolar.