Finned u-shaped solar collector tube

Abstract

The invention discloses a finned u-shaped solar collector tube, which mainly comprises a u-shaped copper tube, a sail-shaped fin, a single-sealing cover, a transparent heat preservation tube, a reflective diaphragm and the like. Due to the adoption of a vacuum sealing heat preservation measure combining the single-sealing cover and the single-layer transparent heat preservation tube, the finned u-shaped solar collector tube realizes the heat collection scheme of directly taking the fin of the u-shaped copper tube as a solar irradiation surface, changes heat collection and heat transfer ways adopted in the prior art, cancels redundant low-efficiency intermediate heat transfer links, simplifies a structure, directly transfers radiation energy collected by the fin into a heat transfer medium in the u-shaped copper tube, remarkably reduces the surface temperature of the irradiation surface, improves a heat transfer rate and heat efficiency, enables a plurality of technical measures such as the sail-shaped fin, a heat absorption channel, reflective heat-aggregation, a matt black body and the like capable of increasing an effective heat collection area and improving the heat collection efficiency to be applied to achieve the technical effects of radiant absorptance alpha of 96 percent, the heat efficiency improved by about 40 percent and reduction in the cost, has the characteristics of rational structural design, reduction in the cost, improved heat efficiency and the like, and the advantages of low heat diffusion loss, high heat transfer rate, reliability, simple process and the like, and is convenient to arrange and easy to produce in large scale.

Description

technical field [0001] The invention relates to a solar "U-shaped" heat collecting tube, in particular to a solar heat collecting tube which can obviously improve the utilization rate of solar radiation energy, and belongs to the field of solar energy application. Background technique [0002] The solar "U-shaped" heat collecting tubes in the prior art are actually a "U-shaped tube-type light-to-heat conversion system". Its structure mainly includes "U" heat-conducting copper tube, metal heat-conducting ring, plastic cover and "vacuum glass" heat-collecting tube coated with metal heat-absorbing coating between layers. The "U"-shaped heat-conducting copper tube has a diameter of φ8~φ10mm, The copper tube with a length of 3000-4000mm is bent into a "U" shape, and the metal heat-conducting ring is respectively matched with the outer surface of the "U"-shaped heat-conducting copper tube and the inner circle of the glass bulb, and the plastic cover covers the "U"-shaped copper tu...

AI Technical Summary

Problems solved by technology

Because the thickness of the metal heat-absorbing coating on the outer surface of the inner tube is limited by the metal spraying process, just like the process problems in the thickness of the electroplating layer, the skin will peel off when the layer thickness is too large, so the current metal heat-absorbing coating is aimed at The obvious light transmission phenomenon can be seen in the visual field, but it cannot be solved, so it is unlikely to further increase the α value.

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