A Second Concentrating Reflection-Uniform Heat Flow Trough Solar Collector

Abstract

The invention discloses a secondary concentrating reflection-uniform heat flow trough solar heat collector. The heat collector includes a parabolic trough reflector, a reflector bracket, a vacuum heat collecting tube and a secondary compound plane reflector, and the secondary compound plane reflector and the vacuum heat collecting tube are respectively placed above and below the focal line of the parabolic trough reflector Position, a small part of the sunlight is irradiated to the sun-facing wall of the vacuum heat collecting tube through the inner side of the secondary compound plane reflector; the remaining part of the light is reflected to the sun-facing wall of the vacuum heat collecting tube after the parabolic groove reflector completes the first light concentration. ; A part of the light is reflected to the sun-facing wall of the vacuum heat collecting tube after passing through the secondary composite plane reflector to complete the secondary light concentration. The invention realizes uniform luminous flux on the circumferential wall of the vacuum heat collecting tube, solves the problem of uneven heat flux distribution in the circumferential direction of the heat collecting tube in the traditional trough heat collector, effectively reduces the thermal stress damage of the heat collecting tube, and has a simple transformation process. low cost.

Description

technical field [0001] The invention belongs to the technical field of solar thermal utilization, in particular to a secondary concentrating reflection-uniform heat flow trough solar heat collector. Background technique [0002] Solar energy is the most abundant and clean renewable energy source on earth. The sum of the energy falling on the earth every hour is about the world's total annual energy consumption. The efficient, safe and low-cost utilization of solar energy can effectively solve the global energy problem. However, the current collection, conversion, distribution and final use of solar energy have economic and technical difficulties. The focus of solar thermal utilization is to convert solar energy into thermal energy and apply it to thermal power generation, thermochemical conversion, heating and cooling. According to the concentrated heat collection method, it can be divided into trough type, dish type and tower type. Among them, the trough type solar heat c...

AI Technical Summary

Problems solved by technology

In the present invention, a special optically designed secondary reflector is added above the vacuum heat collecting tube. Without changing the basic configuration of the original trough solar heat collector, the luminous flux transfer is realized through the secondary reflector, so that the surrounding area of ​​the heat collecting tube Uniform distribution of heat flux in the direction, so as to solve the problem of uneven distribution of heat flux in the circumferential direction of the collector tube in traditional trough collectors, resulting in large thermal stress or even bending deformation, affecting the heat collection efficiency of the collector, and even causing mechanical damage to the collector tube, etc. technical problem

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