27-08-2014, 03:16 PM
Energy is generally considered as prime mover for social and economic development of a nation. Demand for energy is rising rapidly at an alarming rate with growing population, industrialization, transportation etc. However, continuous use of fossil fuels over a long time period resulting in energy crisis, environmental threat and price rise. Global energy crisis and environmental threat became source of motivation for the recent growing interest in Renewable Energy sources. Heavy stress on electricity is generated by increasing demands of Air conditioners and refrigerators. In order to reduce the load on this non renewable resource created by AC’s and refrigerators, we need to move our attention towards renewable energy sources. Passive cooling technique is one of the renowned techniques. Passive cooling makes use of the nature’s potential to do air conditioning. Earth air-tunnel system forms one of the alternatives to AC’s. In this system, air is passed through pipe laid under the earth. The pipe, being at lower temperature than the ambient temperature,