The project was eventually started investigating on energy sources and finally it shifted to researching the traditional products used in India.
Some of the traditional products used in India, without using any external energy are;
• Climate control inside the rooms:
In Kerala, for controlling the temperature inside the rooms wooden ceiling (Thattu) were done, and usually people put mud over these ceiling. The roofs were made using coconut leaves or clay tiles locally called as Oodu.
• Water cooling:
For keeping the water cool inside the Matka people used to put local granite stones and use Ramacham and other Medicinal plants roots.
• Principle of water cooling:
The method or the principle of cooling water followed is Evaporative cooling.
The basic principle relies on cooling by evaporation. When water evaporates it draws energy from the surroundings which produces a considerable cooling effect. Evaporative cooling occurs when air, which is not too humid, passes over a wet surface. The faster the rate of evaporation the greater the cooling will be. The efficiency of an evaporative cooler depends on the humidity of the surrounding air. Very dry air can absorb a lot of moisture so greater cooling occurs. In the extreme case of air, that is totally saturated with water, no evaporation can take place and no cooling occurs.
Generally, an evaporative cooler is made of a porous material that is fed with water. When hot dry air is drawn over the material, the water evaporates into the air raising its humidity and at the same time reducing the temperature of the air.
Assuming the earthenware pot absorbs some of the water in it (which it will, if it is not sealed with a glaze or other coating), the outside of the pot will be slightly moistened. As this moisture on the pot evaporates, the temperature of the pot is reduced due to evaporative cooling (same way sweat cools the body). This cooling effect will keep the temperature of the pot lower than it would otherwise be. This effect will only work as long as the outside of the pot is kept moist.
Water inside the bag:
Stage - 5
This is the basic principle of cooling water in Clay pots / Matka or Canvas/ Davidi.
There are different ways of carrying water, and different types of bags and containers are used all over the world. Some of the natural water containers that can cool water through evaporative cooling are as follows;
Animal Skin water container
Following were some of the water bags which can store water