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Anti-overheating film for solar thermal collector

A solar collector and thermal film technology, which is used in solar thermal power generation, solar thermal devices, coatings, etc., can solve problems such as the inability to solve the harm of the collector, prevent the collector from overheating, control the air temperature, The effect of preventing overheating

Inactive Publication Date: 2013-06-12
HIMIN SOLAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing film layer can maintain a good heat absorption effect, it cannot solve the harm caused by overheating of the collector when it is air-dried

Method used

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  • Anti-overheating film for solar thermal collector
  • Anti-overheating film for solar thermal collector

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] see figure 1 , the film layer described in the embodiment of the utility model is used for vacuum heat collectors, and the preparation method adopts common magnetron sputtering technology. In this example, the second bottom metal layer 3 selects aluminum with a thickness of 80 nanometers, and the second bottom metal layer 3 is stainless steel with a thickness of 10 nanometers. The absorption layer 4 and the anti-reflection layer 5 adopt an interference absorption film layer. The total thickness of the absorption layer 4 and the anti-reflection layer 5 is about 220 nanometers. Gas, the absorption ratio of the film layer can reach 0.943, and the normal emission ratio is 0.065. At an irradiance of 800W / m 2 , the drying temperature of the vacuum tube can reach 270 ℃.

example 2

[0029] see figure 1 , in this example, the second bottom metal layer 3 is selected from aluminum with a thickness of 80 nanometers, the second bottom metal layer 3 is stainless steel with a thickness of 100 nanometers, the absorption layer 4 and the anti-reflection layer 5 adopt an interference absorption film layer, and the absorption layer 4 and the total thickness of the anti-reflection layer 5 is about 220 nanometers. After vacuum baking and exhausting at 450°C, the absorption ratio of the film layer can reach 0.945, the normal emission ratio is 0.129, and the irradiance is 800W / m 2 , the drying temperature of the vacuum tube is 190°C.

example 3

[0031] see figure 1 , in this example, the second bottom metal layer 3 is selected from aluminum with a thickness of 80 nanometers, the second bottom metal layer 3 is stainless steel with a thickness of 150 nanometers, the absorption layer 4 and the anti-reflection layer 5 adopt interference absorption film layers, and the absorption layer 4 And the total thickness of the anti-reflection layer 5 is about 220 nanometers. After vacuum baking and exhausting at 450°C, the absorption ratio of the film layer can reach 0.944, the normal emission ratio is 0.165, and the irradiance is 800W / m 2 , the drying temperature of the vacuum tube is 160°C.

[0032] The utility model also provides another anti-overheating film layer for solar heat collectors, comprising a bottom metal layer 11, an absorbing layer 12 and an anti-reflection layer 13 which are sequentially arranged on the substrate 10, and the bottom metal layer 11 is composed of Combination of two metals with different emissivity ...

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Abstract

The invention discloses an anti-overheating film for a solar thermal collector, and belongs to the field of solar thermal collectors. The anti-overheating film comprises a bottom metal layer, an absorption layer and an antireflection layer arranged on a substrate in turn, wherein the bottom metal layer comprises at least two bottom metal layers, and the plurality of bottom metal layers are respectively metal layers with different emissivity ratios and different thicknesses; or each bottom metal layer is combined by two metals with different emissivity ratios. By adjusting the materials and thicknesses, or content of metals in each of the at least two bottom metal layers with different emissivity ratios and different thicknesses or the bottom metal layers combined by two metals with different emissivity ratios, the resistivity of the film is changed and the required emissivity ratio of the film is achieved; therefore, the aim of preventing the collector from being overheat by controlling the idle sunning temperature of the film is fulfilled.

Description

technical field [0001] The utility model relates to a film layer of a solar heat collector, in particular to an anti-overheating film layer for a solar heat collector. Background technique [0002] At present, all-glass vacuum heat collecting tubes are widely used in domestic solar collectors, and solar water heaters often overheat when they are in the air. [0003] Depending on the type of vacuum heat pipe used in the collector, the specific performance is different. For water heaters using glass heat pipe vacuum heat collecting tubes, when the temperature is too high, the internal pressure will increase, which may sometimes cause the glass heat pipe to break. Once the heat pipe breaks, it will cause great harm. For water heaters using gravity heat pipes, when the air drying temperature is too high, the aging of the heat pipes will be accelerated, which will affect the heat transfer efficiency and service life of the heat pipes. For pressurized water heaters, when the air...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24J2/48B32B15/04
CPCY02E10/40F24J2/4652F24J2/485F24S70/20F24S70/30
Inventor 许维华焦红霞石英利郝志永吴连海李静静
Owner HIMIN SOLAR
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