Solar light reflecting plate and light collecting/heat collecting device

Patent metadata

Field	Value
Publication number	US-9234680-B2
Application number	US-201214238319-A
Country	US
Kind code	B2
Filing date	Aug 9, 2012
Priority date	Aug 26, 2011
Publication date	Jan 12, 2016
Grant date	Jan 12, 2016

Abstract

A solar light reflecting plate used for a light condensing and heat collecting device which includes a solar light reflecting plate that reflects and condenses solar light and a heat collecting tube that receives the solar light condensed by the solar light reflecting plate and is heated by the condensed solar light, wherein the solar light reflecting plate includes at least a rolled substrate, a surface roughness of a solar light reflecting surface that is an outermost surface and that reflects solar light is 0.02 μm to 1.0 μm in terms of arithmetic mean roughness Ra, and the solar light reflecting plate is disposed so that an angle between a rolling direction of the substrate and a longitudinal direction of the heat collecting tube is 80° to 100°.

First claim

The invention claimed is:

1. A solar light reflecting plate having a bent to a predetermined curvature radius and condensing the solar light on a focal point used for a light condensing and heat collecting device which includes a solar light reflecting plate that reflects and condenses solar light and a heat collecting tube positioned on the focal point that receives the solar light condensed by the solar light reflecting plate and is heated by the condensed solar light, wherein
(1) the solar light reflecting plate comprises at least a rolled substrate,
(2) a surface roughness of a solar light reflecting surface that is an outermost surface and reflects solar light is from 0.02 μm to 1.0 μm range in terms of arithmetic mean roughness Ra, and
(3) the solar light reflecting plate is disposed so that an angle between a rolling direction of the substrate and a longitudinal direction of the heat collecting tube is from 80° to 100° range.

2. The solar light reflecting plate according to claim 1 , further comprising a metal-containing reflective film provided on the substrate.

3. The solar light reflecting plate according to claim 2 , further comprising a protective film provided on the reflective film.

4. The solar light reflecting plate according to claim 1 , wherein the substrate is either a stainless steel plate or a cold-rolled steel plate.

5. The solar light reflecting plate according to claim 1 , wherein an excellent light condensing property to the heat collecting tube is obtained by setting the angle between the rolling direction of the solar light reflecting plate and the longitudinal direction of the heat collecting tube within a range of 80° to 100° when the solar light reflecting plate has an arithmetic mean roughness Ra of from 0.02 μm to 1.0 μm, such that the reflected light reflected by the solar light reflecting surface having rolling lines formed thereon can spread and be condensed in one dimension in a direction perpendicular to the rolling direction, the one dimensional light spreading and the longitudinal direction of the heat collecting tube being made to coincide with each other.

6. A light condensing and heat collecting device including a solar light reflecting plate having a bent to a predetermined curvature radius and reflecting and condensing solar light and a heat collecting tube positioned on the focal point that receives the solar light condensed by the solar light reflecting plate and is heated by the condensed solar light, wherein
(1) the solar light reflecting plate comprises at least a rolled substrate,
(2) in the solar light reflecting plate, surface roughness of a solar light reflecting surface that is an outermost surface and that reflects the solar light is from 0.02 μm to 1.0 μm range in terms of arithmetic mean roughness Ra, and
(3) the solar light reflecting plate is disposed so that an angle between a rolling direction of the substrate and a longitudinal direction of the heat collecting tube is from 80° to 100° range.

7. The solar light reflecting plate according to claim 2 , wherein the substrate is either a stainless steel plate or a cold-rolled steel plate.

8. The solar light reflecting plate according to claim 3 , wherein the substrate is either a stainless steel plate or a cold-rolled steel plate.

9. The light condensing and heat collecting device according to claim 6 , wherein an excellent light condensing property to the heat collecting tube is obtained by setting the angle between the rolling direction of the solar light reflecting plate and the longitudinal direction of the heat collecting tube within a range of 80° to 100° when the solar light reflecting plate has an arithmetic mean roughness Ra of from 0.02 μm to 1.0 μm, such that the reflected light, reflected by the solar light reflecting surface having rolling lines formed thereon can spread and be condensed in one dimension in a direction perpendicular to the rolling direction, the one dimensional light spreading and the longitudinal direction of the heat collecting tube being made to coincide with each other.

Assignees

• Sashi Kazumichi
• Oshige Takahiko
• Nishiyama Naoki
• Sakamoto Yoshihito
• Jfe Steel Corp

Inventors

• Sashi Kazumichi
• Oshige Takahiko
• Nishiyama Naoki
• Sakamoto Yoshihito

Classifications

• C23C14/025

  Metallic sublayers · CPC title

• F24S23/74

  with trough-shaped or cylindro-parabolic reflective surfaces · CPC title

• F24S70/30

  Auxiliary coatings, e.g. anti-reflective coatings · CPC title

• C23C14/081

  of aluminium, magnesium or beryllium · CPC title

• C23C14/028

  Physical treatment to alter the texture of the substrate surface, e.g. grinding, polishing · CPC title