Solar heat collector tube and production method thereof

Patent metadata

Field	Value
Publication number	US-11149987-B2
Application number	US-201616073375-A
Country	US
Kind code	B2
Filing date	Nov 18, 2016
Priority date	Jan 29, 2016
Publication date	Oct 19, 2021
Grant date	Oct 19, 2021

Abstract

A solar heat collector tube in which at least an infrared reflective layer, a sunlight-heat conversion layer and an anti-reflection layer are provided on the outer surface of a tube, through the interior of which a heat medium can flow, wherein the infrared reflective layer is an Ag layer in which silicon, silicon nitride or a mixture thereof is dispersed, and a method for producing the solar heat collector tube wherein the infrared reflective layer that is an Ag layer, in which silicon, silicon nitride or a mixture thereof is dispersed, is formed by sputtering in the presence of a gas including nitrogen gas, with Ag and silicon being used as targets.

First claim

The invention claimed is:

1. A solar heat collector tube in which at least an infrared reflective layer, a sunlight-heat conversion layer and an anti-reflection layer are provided on the outer surface of a tube, through the interior of which a heat medium can flow,
wherein the infrared reflective layer is an Ag layer in which silicon, silicon nitride, or a mixture thereof is dispersed,
wherein a metal protective layer is provided between the infrared reflective layer and the sunlight-heat conversion layer,
wherein the metal protective layer is formed by at least one metal selected from the group consisting of Mo, W, Ta, and Nb, or the metal protective is layer is formed by a compound of silicon or nitrogen with at least one metal selected from the group consisting of Mo, W, Ta, and Nb,
wherein a content of the silicon, the silicon nitride, or the mixture thereof in the infrared reflective layer is from 0.1 to lower than 10 at %, and
wherein at least one metal selected from the group consisting of Mo, W, Ta, Nb, and Al is further dispersed in the Ag layer.

2. The solar heat collector tube of claim 1 , wherein another metal protective layer is provided between the tube and the infrared reflective layer.

3. The solar heat collector tube of claim 1 , wherein the metal protective layer is formed of a material containing the metal that is dispersed in the Ag layer.

4. The solar heat collector tube of claim 1 , wherein the metal protective layer is formed of a compound of silicon or nitrogen, and the metal dispersed in the Ag layer.

5. The solar heat collector tube of claim 1 , wherein an oxygen barrier layer is provided between the metal protective layer and the sunlight-heat conversion layer.

6. The solar heat collector tube of claim 1 , wherein a diffusion preventing layer is provided between the tube and the infrared reflective layer.

7. The solar heat collector tube of claim 5 , wherein a reaction preventing layer is provided between the metal protective layer and the oxygen barrier layer or the sunlight-heat conversion layer.

8. The solar heat collector tube of claim 6 , wherein a reaction preventing layer is provided between the diffusion preventing layer and the metal protective layer.

9. A method for producing a solar heat collector tube in which at least an infrared reflective layer, a metal protective layer, a sunlight-heat conversion layer and an anti-reflection layer are provided on the outer surface of a tube, through the interior of which a heat medium can flow,
the method comprising:
forming the infrared reflective layer that is an Ag layer in which silicon, silicon nitride or a mixture thereof is dispersed, by sputtering in the presence of a gas including nitrogen gas, with Ag and silicon being used as targets,
wherein the metal protective layer is formed by at least one metal selected from the group consisting of Mo, W, Ta, and Nb, or the metal protective layer is formed of a compound of silicon or nitrogen with at least one metal selected from the group consisting of Mo, W, Ta, and Nb,
wherein a content of the silicon, the silicon nitride, or the mixture thereof in the infrared reflective layer is from 0.1 to lower than 10 at %, and
wherein at least one metal selected from the group consisting of Mo, W, Ta, Nb, and Al is further dispersed in the Ag layer.

10. The solar heat collector tube of claim 5 , wherein a reaction preventing layer is provided between the metal protective layer and the oxygen barrier layer.

11. The heat solar heat collector tube of claim 1 , wherein a content of the silicon, the silicon nitride or the mixture thereof in the infrared reflective layer is from 0.1 to 5 at %.

12. The method of claim 9 , wherein a content of the silicon, the silicon nitride or the mixture thereof in the infrared reflective layer is from 0.1 to 5 at %.

Assignees

• Toyota Jidoshokki Kk
• Japan Fine Ceramics Ct

Inventors

• Tsutsui Takuhito
• Sasatani Toru
• Noritake Kazuto
• Okuhara Yoshiki
• Kuroyama Tomohiro
• Igimi Daisuke

Classifications

• F24S10/70 Primary

  the working fluids being conveyed through tubular absorbing conduits · CPC title

• F24S70/20

  characterised by absorbing coatings; characterised by surface treatment for increasing absorption · CPC title

• Y02E10/44

  Heat exchange systems · CPC title

• B32B1/08

  Tubular products · CPC title

• C23C14/06

  characterised by the coating material ({C23C14/0021} , C23C14/04 take precedence) · CPC title