Archive : Solar Energy

Pros and Cons of Gallium Arsenide Solar Cells

Pros and Cons of Gallium Arsenide Solar Cells

Gallium arsenide solar cells are very efficient but are expensive. Their efficiency reaches as high as 29% in laboratory and about 20% in real world. Multi junction or tandem solar cells can show even up to 40.9% efficiency. These solar cells are formed by depositing several thin layers of single crystal layers on top of the substrate. The layers are doped oppositely to conduct electricity. Due to heat resistivity and high absorption they have found extensive applications in spacecrafts.

Advantages of Poly Crystalline Solar Cells

Advantages of Poly Crystalline Solar Cells

Polycrystalline solar cells are cheaper than mono crystalline solar cells but are costly as compared to thin film cells. Their efficiency is less than mono crystalline cells but greater than thin film solar cells. In February of 2009, Mitsubishi Electric Corporation achieved 18.9% efficiency with polycrystalline solar cells whereas thin film solar cells convert have just 11% efficiency.

Quantum Dot or Nano Crystalline Solar Cells

Quantum Dot or Nano Crystalline Solar Cells

Quantum dot or nano crystalline solar cells have very high efficiency and are formed by spin coating. The ability of carrier multiplication has made it many times more efficient than other solar cells. Carrier multiplication means it can excite many electrons per incident photon. The materials used in these cells include lead selenide (PbSe), cadmium telluride (CdTe), titanium dioxide (TiO₂) and lead sulfide (PbS).

Thermosiphon Solar Water Heating System

Thermosiphon Solar Water Heating System

Thermosiphon water heating system is a passive water heating system. It works under the principle of convection. Hot water rises up and warm goes down. Gravity is responsible for pulling the cold water down. That is why these systems are generally vertical. Hot water from the top layers is utilized. Heating can be done directly or through a heat transfer fluid.

Mono Crystalline Solar Cells

Mono Crystalline Solar Cells

Mono crystalline solar cells are the earliest form of solar cells. They are formed by depositing thin silicon wafers over rigid glass substrate. They have polka dotted shape. They are very efficient but are expensive and wasteful of material. These are being replaced by polycrystalline solar cells in the market.

Gas Hybrid Cars: Relief To Your Pocket And Environment

Gas Hybrid Cars: Relief To Your Pocket And Environment

Gas Hybrid cars are becoming more and more popular in the auto industry due to the features they offer when comparing to the conventional cars. Before buying a hybrid gas car or even making a decision, one must decide whether features offered by Gas Hybrid cars suits his lifestyle or not!

Solar Powered Jacket: Charging Gadgets On The Move

Solar Powered Jacket: Charging Gadgets On The Move

Every now and then a person gets in to a situation, when he needs his gadget and all he gets in reply is battery low. To counter these situations have a look on Scottevest Solar powered jacket – which can charge all of USB charger suppoted gadgets while you are on the move.

Interesting Facts About Solar Power

Interesting Facts About Solar Power

Ever growing prices of renewable fuel are also increasing the magnitude of utility bills so it is worthwhile to choose renewable energy sources. One must understand some facts about Solar power to help him decide – why to choose Solar power for that big investment out of so many renewable enrgy options?

Benefits Of Trombe Walls

Benefits Of Trombe Walls

Trombe wall is a useful design modification done in the building structures. It traps the energy of the sun during day time and uses it to keep the rooms warm at night. It is an inexpensive way of heating the rooms and the walls are very easy to construct.

Benefits Of A Solar Fountain

Benefits Of A Solar Fountain

A solar fountain is an inexpensive means of improving the view of the buildings and lawns. It uses the energy of the sun to run the pump and charge the battery that acts as a back up at night. It comes in various colours and designs and is fully portable and flexible. It does not require a connection to the power grid and is the best choice for installation in bigger parks.

Benefits Of A Large Solar Collector

Benefits Of A Large Solar Collector

A solar collector is a device that is used to trap the hot air of the sun and uses it to heat the rooms. It is generally installed on the southern wall of the building. A bigger collector is preferable as it caters for the lack of heat insulation and cloudy days.

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