SOLAR PARABOLIC DISH
Parabolic dish collector, one or more parabolic dishes concentrate solar energy at a single focal point. The shape of a parabola means that incoming light rays which are parallel to the dish's axis will be reflected toward the focus, no matter where on the dish they arrive. Light from the sun arrives at the earth's surface almost completely parallel. So the dish is aligned with its axis pointing at the sun, allowing almost all incoming radiation to be reflected towards the focal point of the dish. Most losses in such collectors are due to imperfections in the parabolic shape and imperfect reflection.
Losses due to atmospheric scattering are generally minimal. However, on a hazy or foggy day, light is diffused in all directions through the atmosphere, which reduces the efficiency of a parabolic dish significantly.
|Robust ground system.|
|Lowest construction and installation costs.|
|Winter and summer production.|
|Perfectly adapted to medium- and high-range temperature requirements.|
|Highly visible and environmentally friendly image.|
|Very low maintenance requirements.|
|Can be designed to accommodate accumulations of snow, vegetation and Dust.|
|Structure-aluminum sheet with supporting bars on back.|
|Reflective surface-reflective sheet-10feet by 10feet.|
|Accuracy-99.6%-reflective sheet are tested in Germany.|
|Weight-1.7kg x 8nos-10feet by 10 feet.|
Another type of concentrating solar collector that optically reflects and focuses the suns incident solar energy onto a small receiving area using mirrors or lenses is called a Solar Dish Collector, or more technically, a point focusing collector. By concentrating the sunlight to a single spot, the intensity of the receiving solar energy is magnified many times over with each mirror or lens acting as a single sun shining directly at the same focal point on the dish meaning that more overall power per square meter of dish is achieved.
The concentration factor, also known as the “number of suns”, of a solar dish collector can be greater than 1,000 suns reaching temperatures at the focal point of the receiver (called the “target”) approaching several hundred or even several thousand degrees Celsius depending upon the size of dish and its location.
Unlike the previous solar collector which was in the shape of a long trough, a parabolic solar dish collector is very similar in appearance to a large satellite TV or radar dish making it much smaller than a long trough collector. The curved parabolic shaped dish, which is generally referred to as a “solar concentrator” is the main solar component for this type of solar heating system.
The solar dish is formed into a paraboloidal shape by stamping them out from thin sheet metal or thin aluminium coated mylar, and which themselves can be anywhere between a few feet to several metres in diameter. The parabolic dish collects the incoming solar energy directly from the sun and concentrates or focuses it on a small focal point area positioned in front of the dish.
The parabolic solar dish is covered with many small mirror reflectors all around its shape to help concentrate the thermal energy into a single focal point were the heat absorber is located producing more overall thermal energy per square meter of dish.
These highly polished mirrors can reflect more than 90% of the sunlight that hits them increasing the efficiency of the dish by more than 20% compared to the parabolic trough collector. Mirrors are generally used instead of a single highly polished dish because they are relatively inexpensive, can be easily cleaned and last a long time in an extreme outdoor environment, making them an excellent choice for the reflective surface of a solar dish collector. Also individual mirrors can be easily changed if damaged.
Jammu & Kashmir, Himachal Pardesh, Punjab, Haryana, Uttrakhand, Delhi, Uttar Pardesh,Madhya Pardesh, Bihar, West Bangal , Odisha, Assam, Nagaland , Arunachal Pardesh, Mahaarastra, Chhattishgarh, Goa, Gujrat, Jharkhand, Karnataka, Kerala, Manipur,Meghalaya, Mizoram, Sikkim,Telangana, Tripura, Tamilnadu,Rajasthan.
Afganisthan, Nigeria, Austria, Qatar, Cambodia.
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