Thin film thermoelectric power generation and selective absorption coating coupled solar collector tube

Abstract

The invention provides a thin film thermoelectric power generation and selective absorption coating coupled solar collector tube. The solar collector tube comprises a metal tube and a cover glass tube; the outer wall of the metal tube is successively provided with a first insulating layer, a PN junction layer, a second insulating layer and a selective absorption coating; the PN junction layer is connected with an extraction electrode; the two ends of the cover glass tube are each fused with a Kovar metal sleeve; the Kovar metal sleeves form a vacuum sandwich by forming a sealed connection withthe outer wall of the metal tube through a corrugated tube assembly; a wire connected with the extraction electrode forms a zigzag section in the vacuum sandwich; the tail of the zigzag section is led out of the cover glass tube through direct sealing or through a transition material. The solar collector tube especially applies to a trough solar collector tube which can make the temperature difference between the two temperature zones reach 10-50 DEG C. Therefore, the natural temperature difference of the trough solar collector tube can be fully utilized to realize thermoelectric power generation, and there is no need to actively dissipate heat in the low temperature zone.

Description

technical field [0001] The invention relates to a coating structure of a solar heat collection tube, in particular to a glass-metal fusion-sealed straight-through solar heat collection tube structure utilizing thin-film thermoelectric power generation coupled with a selective absorption coating. Background technique [0002] Solar energy has the great advantages of being inexhaustible, inexhaustible, clean and environmentally friendly, and has been accepted by the society and developed rapidly. [0003] At present, there are two main ways to utilize solar energy: power generation and heat utilization. Power generation is divided into photovoltaic power generation and solar thermal power generation. Heat utilization mainly converts solar energy into heat energy to provide medium-temperature and low-temperature industrial or civil heat below 250°C. With the development of technology, there is a trend of technology coupling between photovoltaic and photothermal, that is, when...

AI Technical Summary

Problems solved by technology

[0006] 1. They are all based on the combination of the existing thermoelectric power generation sheet module and the low-temperature solar collector tube. The structure and process are complicated, and it is difficult to carry out large-scale production

[0007] 2. Due to the small temperature difference, the actual power generation efficiency is low, and there will be problems with poor additional input and output benefits and low economic benefits that cannot be accepted by the market

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