Solar vacuum heat collection tube

Abstract

The invention discloses a solar vacuum heat collection tube. The solar vacuum heat collection tube comprises an inner tube and an outer tube which are connected in a sleeved mode, a vacuum region is defined between the inner tube and the outer tube, and at least one middle glass tube is connected between the inner tube and the outer tube in a sleeved mode. The middle glass tube is arranged, radiation heat exchange between the inner tube and the outer tube needs to pass through all the middle glass tubes, and therefore the heat resistance of the radiation heat exchange process of the inner tube and the outer tube can be increased, the heat transferred to the outer tube by the inner tube through radiation heat exchange can be reduced, the temperature of the outer tube is reduced, the heat of convection heat exchange and radiation heat exchange between the outer tube and the outside is reduced, finally the heat loss of the solar vacuum heat collection tube is reduced, and the heat collection efficiency of a solar heat collection system is improved.

Description

technical field [0001] The invention relates to the technical field of solar light and heat utilization, in particular to a solar vacuum heat collecting tube. Background technique [0002] The trough solar heat collection system is a mature and stable solar heat utilization device, which is widely used in solar thermal power generation, material drying, seawater desalination and other technical fields. The main structure of the traditional trough solar collector tube includes an outer glass tube, a metal inner tube and an end cap, wherein the heat transfer medium is located in the metal inner tube. The process of solar radiation energy being collected in the trough solar collector tube is as follows: the sun's rays first pass through the outer glass tube and reach the metal inner tube, and the temperature of the metal inner tube rises after absorbing solar radiation energy, and then transfers the energy Transfer to the heat transfer medium in the tube, so as to realize the ...

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Problems solved by technology

[0004] However, under normal circumstances, the temperature of the metal inner tube under working conditions is much higher than that of the outer glass tube. Therefore, although the convective heat transfer between the metal inner tube and the glass outer tube is weak, there is a strong radiation heat transfer. Therefore, the solar vacuum heat collection tube still has high heat loss, resulting in low heat transfer efficiency of the trough solar heat collection system

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