Electrical and Technology

Green Building  Green Building does not refer to building which are green in colour or have been constructed with green parks around. It refers to a conscious practice of addressing the issue of resource conservation in an integrated and scientific manner. By definition, a green building is one which uses less water, optimizes energy efficiency, conserves natural resources, generates less waste and provides healthier spaces for occupants, as compared to a conventional building. Modern-day building have a tendency to use designs and materials which are resource-intensive and are quite often operate in isolation with the nature. Such buildings are very poor in energy efficiency and generate a lot of waste, adding to faster depletion of natural resources. Thus, building are seen today as one of the major pollutants to affect urban air quality and contribute to climate change. GREEN BUILDING A green building depletes very little of the natural resources during its constructi...

The visible and near visible (Ultra-Violet and near Infrared) electromagnetic radiation that is emitted by the Sun is termed as Solar Radiation . The solar radiation has a spectral or wavelength, distribution that corresponds to different energy levels, short wavelength radiation has a higher energy than long wave length radiation. These solar radiation convert into useful forms of energy such as "heat and electricity", using a variety of technologies. The technical feasibility and economical operation of these technologies at a specific location depends on the available solar radiation or solar resource. Photovoltaic Effect :- Photo-voltaics are the technology for conversion of solar radiation (sunlight) directly into electricity. A photo-voltaic cell also called a PV or a solar cell is the device used for this purpose. The PV technology has  emerged as a promising technology to generate electricity for small applications like lighting and meeting other electric...

There are other energy sources which are not so popular but are now gaining importance such as:- Hydrogen Energy Chemical Sources of Energy (Fuel Cells) Geo-Thermal Energy Ocean  and Tidal Energy Biofuels Animal Energy Hydrogen Energy:- In the case of Hydrogen energy , electricity is produced through an electrochemical reaction between hydrogen and oxygen. Hydrogen can be produced from the electrolysis of water using solar energy. It can be extracted from sewage gas, natural gas, naptha  or biogas . Fuel cells can be very widely used for a wide range of applications once they become commercially viable. Hydrogen as Fuel:- Hydrogen as a gas is so much lighter than air that it rises fast and is quickly ejected from the  atmosphere . It found only in the compound which is water and is result of hydrogen combining with oxygen. Hydrogen, when combined with carbon, forms different compounds like methane, coal and petroleum. Hydrogen is ...

Wind is the natural movement of air across the land or sea. Wind is caused by uneven heating and cooling of the earth's surface and by the earth's rotation. Land and water areas absorb and release the different amount of heat received from the sun. As warm air rises, cooler air rushes in to take its place, causing local winds. The rotation of the earth changes the direction of the flow of air. Wind is simple air in motion. It is caused by the uneven heating of the earth's surface by the sun. Since the earth's surface is made of very  different types of land and water, it absorbs the sun"s heat at different rates. During the day, the air above the land heats up more quickly than the air over water. The warm air over the land expands and rises and the heavier, cooler air rushes in to take its place, creating winds. At night, the winds are reversed because the air cools more rapidly over land than over water. Today, wind energy is mainly used to generate electr...