Method for arranging glass bar width of parabolic refraction solar light collector

Abstract

The invention is a distribution method for glass stripes of a parabolic cylinder solar condenser, in condition that the photic surface is plane, part of the reflection ray is out of the photic surface along with the increase of angle alpha between the parabolic cylinder surface and the horizon plane, thus the light gathering efficiency is decreased. The invention determines the width of the glass stripes of the parabolic cylinder solar condenser through creating a mathematic model Wi=(1-4i2a2L2)L, guarantees all the light are in the photic surface, increasing the efficiency of the solar condenser.

Description

technical field [0001] The invention relates to a parabola folded surface solar concentrator, in particular to a method for arranging the width of glass strips of the parabolic folded solar concentrator. Background technique [0002] The development and utilization of solar energy is an effective means to solve the energy crisis of mankind. At present, all countries have invested a lot of manpower and material resources in in-depth and extensive research. The development of solar concentrators with practical value to achieve low cost and increase solar energy density is one of the main ways to promote the widespread application of solar energy (Liu Yuheng. New development of photovoltaic concentrating technology [J]. Solar Energy, 1999, (4): 5-8.). After concentrating solar energy, it can be widely used in many fields such as photo-thermal utilization (power generation, refrigeration), photovoltaic-voltaic power generation (Yang Zhiyong. Preliminary research on the way of s...

AI Technical Summary

Problems solved by technology

At present, the parabolic curved surface solar concentrator is usually composed of a parabolic curved surface silver-plated glass coated with a protective layer and fixed on a support. This kind of concentrator cannot be widely used in practice, and mainly has the following defects: The professional technology and equipment required for hot bending into a parabolic cylinder in a special mold and then plating a silver reflective layer lead to a substantial increase in processing costs; due to working in a harsh natural environment, even if the protective layer is coated with copper Paint or use plastics to further protect the silver-plated surface, the silver reflective layer will still fall off within one or two years and lose its use value

In the utility model patent 02224631.2, a plurality of flat silver-plated double-layer glass strips are connected side by side in the groove of the parabolic curved frame, and the folded parabolic cylindrical solar concentrator (Ning Duo, etc., the household solar concentrator automatically The design of the tracking system [J]. Journal of Northwest Institute of Light Industry, 2002, 20(2): 59-62.), from the combination of theory and practice, it effectively solves the problem of the commonly used reflective parabolic concentrator in the process of use. There have always been three problems of uneven light concentration, high cost of surface processing, and short life. The purpose of increasing solar energy density has been achieved. However, in practice, it is found that this product is not effective when the light-receiving surface is a cylinder (such as a solar hot water pipe). is the most ideal; and for the case where the light-receiving surface is flat (such as solar photovoltaic panels), as the angle α between the parabola and the horizontal plane increases, part of the reflected light is located outside the light-receiving surface, resulting in a decrease in the concentration efficiency. As far as the photovoltaic panel is used as the light-receiving surface, changing its plane to a folded surface can also solve this problem, but it will bring great difficulties to the sealing process of the photovoltaic panel

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