Utilization and Storage of Solar Energy for supplying in night and Coudy Days.

Heating of houses and office building by solar energy it practiced in south western part of USA since 1958.In these devices solar energy is absorbed by blackened aluminium plates and then transmitted trough air or water circulated through metal tubes attached to the collecter plates. In oreder to store heat for the night sodium sulphate is used as a heat reservoir.Solar heating plant are costly, but they reduce the fuel cost by as much as 90 per cent.
In hot country like Africa, India, Brazil we would be more interested in air-conditioning our houses rather than heating them. No attempt has been made in this direction so for. Some of our industrialists should get interested in this development. A small investment by them on scientists and research for this specific purpose would bring them rich dividends.

Storage of solar Energy.

An inportant problem in the utilization of solar energy is its storage for the dark hours of the night and coudy days. So for water, Glauber's salt and other other heat-absorbing chemical have been used for storing solar energy. Another possibility would be to decompose water by solar energy into hydrogen and oxygen, and latter use them in fuel cells to generate electricity. the most efficient method of storing solar energy is its conversion into electricity and storing the same in batteries of the same type that are use in cars. It is possible to attain 20 per cent effiecency with the help of these devices.