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Straightthrough type double glazing vacuum solar heat collection tube

A solar heat collection tube and double-layer glass technology, applied in the field of solar energy applications, can solve the problem of low heat collection efficiency, achieve good heat collection effect, avoid tube explosion, and reduce the number of welds

Inactive Publication Date: 2008-09-03
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the shortcomings of the existing straight-through glass heat collecting tubes that can only eliminate the expansion through the axial expansion and contraction of the bellows, and the heat collection

Method used

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  • Straightthrough type double glazing vacuum solar heat collection tube
  • Straightthrough type double glazing vacuum solar heat collection tube
  • Straightthrough type double glazing vacuum solar heat collection tube

Examples

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Example Embodiment

[0027] Such as figure 1 The straight-through double-glazed vacuum solar collector tube shown includes a glass outer tube 1 and a glass inner tube 2 arranged in the glass outer tube. The glass inner tube is open at both ends, and the outer surface of the glass inner tube is provided with solar energy selection The absorbent coating 3 has a vacuum space 4 between the glass inner tube and the glass outer tube, and a getter 8 can be placed in the vacuum space to ensure a better vacuum effect. A light-concentrating and reflecting element 6 is provided between the backlight surface of the glass inner tube and the glass outer tube, and an expansion joint 5 is arranged at one end of the straight-through double-glazed vacuum solar collector tube. The expansion joint 5 is shown in Fig. 5 , Figure 6 The section shown is a U-shaped annular expansion joint, which is made of elastic material, and the linear expansion coefficient of this material is 3×10 -6 m / m·℃ to 5×10 -6 between m / m·℃. The ...

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Abstract

The invention pertains to solar energy application field, and provides a straight through type double-layer glass vacuum solar energy heat collection tube comprising an internal glass tube and an external glass tube disposed outside the internal glass tube. The internal glass tube is open at the two ends, a solar energy selective absorption coating is provided on the outer surface of the internal glass tube, vacuum space in which a degasser may be disposed is provided between the internal glass tube and the external glass tube, a light focusing reflective element is disposed between a backlight face of the internal glass tube and the external glass tube, and a ring-shaped expansion joint which is made of materials with a linear thermal expansion coefficient between 3*10<-6> m/m DEG C to 5*10 <-6> m/m DEG C is also provided with a U-shaped section, is disposed at the terminals of the internal glass tube and the external glass tube, and is connected hermetically with the internal glass tube and the external glass tube. Shortcomings of straight through type glass heat collection tubes in prior art, which are easy-broken and low heat-collecting efficiency, are overcome.

Description

Technical field [0001] The invention relates to the field of solar energy applications, in particular to a straight-through double-glazed vacuum solar heat collecting tube. Background technique [0002] At present, the collector tubes used in the market are mostly closed at one end or a straight-through glass inner tube with a double-layer glass tube structure with both ends open. The outer surface of the glass inner tube is a vacuum chamber between the outer glass tube and the inner glass tube. Coated with solar selective absorption coating. When the all-glass vacuum heat collecting tube is working, the temperature difference between the inner and outer tubes is relatively large, and the tube is likely to burst. [0003] The patent number is ZL99221202.2, and the application date is June 10, 1999. The patent named Straight-through glass vacuum solar collector tube proposes a solution. Its structure has outer glass tube and inner glass tube, inner and outer glass. There is a vacu...

Claims

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Application Information

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IPC IPC(8): F24J2/05F24S10/40
CPCY02E10/44
Inventor 王军杜斌
Owner SOUTHEAST UNIV
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