No risk of depletion;
② safe and reliable, no noise, no pollution emissions, the absolute environmental (pollution-free);
③ not limited by the geographical distribution of resources, installed in the roof of the building at the same time the advantages of beauty;
④ no need to consume fuel and erection of transmission lines can be local power supply;
⑤ high energy quality (the highest laboratory conversion rate has reached more than 47%);
⑥ users from the emotional easy to accept and very fond of;
⑦ short construction period, access to energy to spend a short time;
⑧ from the national security point of view, photovoltaic power generation can achieve their own supply, to avoid the devastation caused by the war
Analysis of Fresnel Lens for Solar Energy
Glass-based silicon large Fresnel lens, can be used for solar concentrator.
- Advantages: Fresnel lens is a flat condenser, light weight, the price is relatively low, but also a little focus and line focus of the points, generally made of plexiglass or other transparent plastic, but also useful glass, mainly used for Condenser solar cell power generation system. China from the 1970s to the 1990s, the use of solar devices for Fresnel lens developed. A large area of flexible transparent plastic Fresnel lens can be processed by molding method, and point-focusing Fresnel lens with 1.5m diameter can also be processed by combination molding tool. Recently, a linear glass Fresnel lens has been processed by a molding method.
What is a Fresnel lens?
Fresnel lens is based on the French photophysicist “FRESNEL” invented the principle of design using different processing methods (ultra-precision computer numerical control machine tool technology, electroforming mold technology and PE (polyethylene) material suppression process). The first in 1800 used in the navigation lighthouse, after the extension with so far, now more use of polyethylene plastic injection molding process.
Fresnel lens (Fresnel lens), also known as thread lens, mostly made of polyolefin material injection of thin slices, but also made of glass, the surface of the lens side of the smooth side, the other side burned from small to large concentric circles , Which is a fine structure of the optical components, from the front to see it like a dart plate, by a ring of concentric circles. Its texture is the use of light interference and interference and according to the relative sensitivity and reception angle requirements to design, the lens requirements are high.
Its working principle is very simple: Suppose a lens of the refractive energy only occurs in the optical surface (such as: lens surface), remove as much as possible optical materials, while retaining the curvature of the surface.
Another understanding is that the lens continuous surface part “collapsed” to a plane. From the profile, the surface consists of a series of zigzag groove, the central part of the oval arc, each groove with the adjacent groove between the different angles, but will focus on one light, the formation of the central focus, That is the focus of the lens. Each groove can be seen as a separate small lens, the light is adjusted to parallel light or condenser. This lens also eliminates part of the spherical aberration.
Fresnel lens classification
1 from the optical design up division:
- A) positive Fresnel lens:
The light enters from one side and passes through the Fresnel lens on the other side to focus on one or the parallel light. Focus on the other side of the light, and is a finite conjugate.
This type of lens is usually designed as a collimator (such as projection with Fresnel lens, magnifying glass) and condenser lens (such as solar concentrating heat with Fresnel lens.
- B) negative Fresnel lens:
In contrast to the positive chenille lens, the focus and light are on the same side, usually on its surface, as a first reflective surface.
What is the polygon of the Fresnel lens?
What is the polygon of the Fresnel lens?
Such as solar concentrating batteries, the condenser is 500 times, how is it achieved?
Sun Fresnel lens condenser, the focus of the lens just fell on the photovoltaic cell. When the lens surface facing the sun, the light will be focused on the photovoltaic cell, bringing together more energy, which requires a smaller area of photovoltaic cells, significant cost savings.
Condensation ratio K: available formula: K = lighting area / focal area.