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Volumetric air heat absorber of multi-cavity surface for solar thermal power generation

A technology of solar thermal power generation and heat absorber, which is applied in the direction of solar thermal power generation, solar heat collectors, and solar heat collector safety, and can solve the effects of internal air working fluid heat transfer efficiency, thermal ablation of porous media materials, absorption Problems such as uneven temperature distribution of the heater can be achieved to improve the thermal response effect, reduce radiation heat loss, and improve the subsequent working ability

Active Publication Date: 2016-12-07
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature distribution inside the heat absorber is uneven, which easily leads to thermal ablation of the porous media material, and has a certain impact on the heat transfer efficiency of the internal air working medium

Method used

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  • Volumetric air heat absorber of multi-cavity surface for solar thermal power generation
  • Volumetric air heat absorber of multi-cavity surface for solar thermal power generation
  • Volumetric air heat absorber of multi-cavity surface for solar thermal power generation

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Experimental program
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Effect test

Embodiment 1

[0030] Such as figure 1 As shown, the present invention includes a secondary concentrator 10 for concentrating solar energy, a heat absorbing carrier 5 , a thermal insulation body 1 and a metal container 3 forming a closed heat absorber cavity 7 . The front end of the metal container 3 is open, and the front end is connected to the rear end of the secondary concentrator 10 . The outer side of the metal container 3 and the secondary concentrator 10 is provided with a thermal insulation body 1 . The metal container 3 is provided with an air intake pipe 2, an air outlet pipe 6, a light-absorbing cavity 9 and a front end sealing plate 14, and the air intake pipe 2 communicates with the inner cavity of the metal container; the light-absorbing cavity 9 is arranged in the inner cavity of the metal container 3, and The secondary concentrator 10 is connected, the light-absorbing cavity 9 is facing the opening direction of sunlight energy projection, and the front end of the light-abso...

Embodiment 2

[0036] Such as figure 2 As shown, its structure is similar to that of Embodiment 1, the only difference is that a gap L can be left between the front end of the metal container 3 and the tail of the secondary concentrator 10, which ensures that the energy flow distribution on the front surface of the metal container 3 is even .

Embodiment 3

[0038] Such as Figure 4As shown, its structure is similar to that of Embodiment 1, except that the secondary concentrator 10 for gathering solar energy is replaced by a composite cavity 15 arranged in the metal container 3, and on the basis of the curved surface geometry of the composite cavity 15 Several light-absorbing cavities 9 are arranged uniformly or according to the distribution of sunlight.

[0039] Such as Figure 5-7 As shown, the geometric shape of the light-absorbing cavity 9 can be a cylindrical cavity, an inverted cone cavity and a combined cavity, and the combined cavity is formed by combining an inverted cone structure and a cylindrical cavity.

[0040] The present invention adopts a high-temperature-resistant metal container 3 to form a closed volume, so that the internal air working medium can work under relatively high pressure and high temperature conditions, effectively improving the subsequent working ability of the working medium; A number of light-a...

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Abstract

The invention discloses a volumetric air heat absorber of a multi-cavity surface for solar thermal power generation. The volumetric air heat absorber comprises a heat absorbing carrier, a heat insulation body and a metal container and is characterized in that the heat insulation body is arranged on the outer side of the metal container, an opening is formed in the front end of the metal container, a solar gathering portion is arranged at the front end of the metal container, an air inlet pipe, an air outlet pipe and a light absorbing cavity are formed in the metal container, and the air inlet pipe is communicated with an inner cavity of the metal container; the light absorbing cavity is formed in the inner cavity of the metal container and is communicated with the solar gathering portion, and the light absorbing cavity faces the opening direction of solar energy projection; the heat absorbing carrier is arranged in the metal container, and a sealed heat absorber cavity is formed by the inner cavity of the metal container and the heat absorbing carrier, and the air outlet pipe is communicated with the heat absorber cavity. A plurality of light absorbing cavities with cavity surfaces are formed in the solar thermal power receiving surface, the contact area of a foam ceramic heat absorbing carrier of a porous medium and the light absorbing cavities can be increased, the heat conduction performance is improved, and meanwhile radiant heat losses of the heat absorber can be reduced.

Description

technical field [0001] The invention belongs to the technical field of high-temperature air heat absorbers for solar thermal power generation, and in particular relates to a volumetric air heat absorber with multi-cavity surfaces for solar thermal power generation. Background technique [0002] In the field of solar thermal power generation technology, due to the low energy flow density of solar radiation resources, direct collection and utilization cannot be carried out. It is often necessary to gather a large area of ​​solar energy into a heat absorber for photothermal conversion, so that heat absorption The working medium flowing in the device obtains heat energy, and the high-temperature and high-pressure working medium drives the thermoelectric conversion device to work, and then realizes the conversion of solar energy into electrical energy output. [0003] The heat absorber is the core device of solar energy-working medium heat energy conversion, which has a significa...

Claims

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Application Information

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IPC IPC(8): F24J2/48F24J2/04F24J2/07F24J2/46F24S20/20
CPCF24S10/00F24S20/20F24S40/50F24S70/16Y02E10/44
Inventor 颜健彭佑多
Owner HUNAN UNIV OF SCI & TECH
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