Secondary light concentrating reflection-uniform heat flow trough type solar heat collector

Abstract

The invention discloses a secondary light concentrating reflection-uniform heat flow trough type solar heat collector. The heat collector comprises a parabolic trough reflector, a reflector bracket, avacuum heat collection tube and a secondary composite plane reflector, wherein the secondary composite plane reflector and the vacuum heat collection tube are placed above and below the focal line ofthe parabolic trough reflector respectively, and a small part of sunlight is irradiated at intervals to the sun-facing wall face of the vacuum heat collection tube through the inner side of the secondary composite plane reflector; primary condensing of the remaining part of the light is completed through the parabolic trough reflector, and a part of the light is reflected to the downsun wall faceof the vacuum heat collection tube; and a part of the light is reflected to the sun-facing wall face of the vacuum heat collection tube through the secondary composite plane reflector to complete secondary condensing. The heat collector achieves uniform irradiated luminous flux on the wall face in the circumferential direction of the vacuum heat collection tube, solves the problem of uneven distribution of the circumferential heat flux density of a heat collection tube in a traditional trough type heat collector, and effectively reduces thermal stress damage of the heat collection tube, the modification process is simple, and the cost is low.

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

Images