Research has revealed that modern Refrigerators emit greenhouse gases called freons and as a result damage the environment. Now a team of scientists at the Oxford University is developing appliances that can work without electricity and thereby reduce the gases. In fact, they have already completed a prototype of a type of fridge patented in 1930 by Albert Einstein and his colleague, the Hungarian physicist Leo Szilard.
The design was partly used in the first domestic refrigerators before more efficient compressors became popular in the 1950s. It avoids the need for freons and instead uses ammonia, butane and water and takes advantage of the fact that liquids boil at lower temperatures when air pressure is lower.
Pressurised gas refrigerators based around Einstein’s design were replaced by freon-compressor fridges because they were not very efficient. But, the British scientists say that by tweaking the design and replacing the types of gases used it would be possible to quadruple the efficiency of the refrigerators.