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MessagePosté le: Jeu 14 Juin - 08:25 (2018)    Sujet du message: ease sales Emmanuel Ogbah Jersey Répondre en citant

This article offers an illustrated description of a method to produce a closed parabolic trough solar energy collector box based on the elasticity of the material. What is described here is basically a manual method to make high efficiency solar collectors against very low cost David Sharpe Jersey , which is particularly suited for teaching, research or demonstration purposes. But it is hard for a manually made collector to match the efficiency, lifetime and water tightness standard of an industrial product using the same method. It will also cost more than the industrial collector.
The method for industrial production of elastic closed parabolic trough boxes will be described in another article later. A parabolic trough solar collector uses a mirror in the shape of a parabolic cylinder to reflect and concentrate sun radiations towards a receiver tube located at the focus line of the parabolic cylinder. The receiver absorbs the incoming radiations and transforms them into thermal energy, the latter being transported and collected by a fluid medium circulating within the receiver tube. This method of concentrated solar collection has the advantage of high efficiency and low cost Eddie Vanderdoes Jersey , and can be used either for thermal energy collection, for generating electricity or for both, therefore it is an important way to exploit solar energy directly.
Known methods to form the parabolic cylinder reflective surface consist either of forming a curved plate material under high temperature, or of adding pre-formed ribs at the back of a flat reflective plate Obi Melifonwu Jersey , then force the plate to follow the curve of the ribs. Both methods are expensive, and both have difficulties to reach a high precision. Our method uses the natural elastic deformation of a planar plate to form a curved surface close to a parabolic cylinder, then redress the approximation error of this surface, again using elasticity. As it is easier to get higher precision by natural elastic deformation Gareon Conley Jersey , this method has the following advantages.
1. Simplicity and low cost. It is actually the only known method for home making high performance parabolic trough solar collectors without any special tools. Not only the production cost drops to far below the other manufacturing methods of parabolic troughs, but also it makes the solar energy collecting cost substantially lower than any fossil fuel. The economic and social signification of the method may be huge.
2. Better performance and quality of the product. It is a general understanding that the smaller a parabolic trough is, the lower is its performance, although smaller parabolic troughs are much more useful than bigger ones. The fundamental characteristics of the performance of a parabolic trough solar collector are its concentration ratio and its optical efficiency. Today Amari Cooper Vapor Untouchable Jersey , the concentration ratio of a parabolic trough collector of width between 1m and 2m is limited to about 50 times under industrial manufacturing conditions and with high cost, while our method can achieve an effective and efficient concentration ratio of over 80 times for a manually made parabolic trough of width less than 1m, together with a higher efficiency.

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SEOUL Bo Jackson Vapor Untouchable Jersey , June 1 (Xinhua) -- South Korea's consumer prices rose 2 percent in May from a year earlier on expensive oil products and higher farm goods prices, a government report showed Thursday.

The headline inflation hovered around 2 percent this year, posting 2 percent in January, 1.9 percent in February Marshawn Lynch Vapor Untouchable Jersey , 2.2 percent in March, 1.9 percent in April and 2 percent in May, according to Statistics Korea.

Oil product prices advanced 8.9 percent in May from a year earlier, raising the overall consumer price inflation by 0.37 percentage points.

Prices for agricultural Derek Carr Vapor Untouchable Jersey , livestock and fishery products picked up 6.2 percent, the fastest rise since January this year. It lifted the overall May inflation by 0.48 percentage points.

Core consumer prices, which exclude volatile farm goods and oil products, gained 1.4 percent in May compared with a year ago. The OECD-method core prices Khalil Mack Vapor Untouchable Jersey , which omit volatile food and energy, rose 1.5 percent last month.

China reiterates support for European integration

Kenya launches flagship standard gauge railway set to transform nation

International Children's Day celebrated across China

Walk a Mile In Her Shoes event held in Toronto

Cheongsam show held at Sanshuiwan scenic spot in Taizhou City

In pics: Amboseli National Park in Kenya

In pics: outdoor cultural performance given by Ulanmuqi in N China

Water park attracts many citizens in SW China's Chongqing



NEW YORK锛?Sept. 29 (Xinhua) -- U.S. stocks declined Thursday as investors digested a batch of economic reports.

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