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Method for determining heat-flow density in opening of solar cavity type heat absorber

A technology of heat flux density and measurement method, applied in calorimeters, instruments, measuring devices, etc., can solve the problems of measuring the entrance of the heat absorber, and achieve the effect of small error and simple and convenient operation.

Active Publication Date: 2016-09-28
XI AN JIAOTONG UNIV
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Problems solved by technology

In view of the characteristics of tower solar energy installation position and high inlet heat flux method, there is no mature technology to directly measure the heat flux density at the inlet of the heat absorber.

Method used

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  • Method for determining heat-flow density in opening of solar cavity type heat absorber
  • Method for determining heat-flow density in opening of solar cavity type heat absorber
  • Method for determining heat-flow density in opening of solar cavity type heat absorber

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0029] figure 1 It can be seen from the figure that the CCD camera measurement points are arranged at the midline position on the first wall 1 and the second wall 2, and there is a movable connection between the walls of the cavity, the first wall 1 and the fifth wall 5 and the second wall 2 and the second wall The angle between the three walls 3 can be adjusted, and the angle between the first wall 1 and the second wall 2 and the heat absorber inlet 7 can be adjusted. The surface unit of the heat absorber inlet 7 in the figure emits sunlight into the cavity, and the sun The light is absorbed by the inner wall of the heat absorber and then diffusely reflected to the CCD camera lens to be recorded by the target surface. The CCD cameras at different positions on the cavity can completely capture the solar radiation in the heat sink.

[0030] figure 2 The cavity of t...

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Abstract

The invention discloses a method for determining the heat-flow density in an opening of a solar cavity type heat absorber. Each of two sidewalls of an inlet of the cavity type heat absorber is provided with CCD cameras uniformly; the CCD cameras shoot other walls of the cavity type heat absorber; a CCD target surface is separated into m image position points, and software Matable is used to process shot images to obtain the radiation energy intensity Iccd-i of each image position points; the inlet of the cavity type heat absorber is separated into Mc surface units, and the radiation transfer factor RDi, j from the ith image position point to the jth surface unit of the inlet of the cavity type heat absorber in the CCD target surface is obtained by utilizing a reverse Monte Carlo method; and an energy relation equation set between the surface units in the inlet of the cavity type heat absorber and the image position points of the target surface of the CCDs is established, and is solved via a damped least squares QR method to obtain the heat-flow density distribution in the inlet of the solar cavity type heat absorber. An indirect convenient method is provided for measuring light spots in the inlet of a tower type solar heat absorber.

Description

technical field [0001] The invention belongs to the field of measuring heat flux density, and in particular relates to a method for measuring heat flux density at an opening of a solar cavity type heat absorber. Background technique [0002] Energy is the material basis for human survival and development. At present, fossil fuels are the main source of energy consumption. With the development of global industry, energy consumption has also increased sharply, and environmental pollution has become increasingly prominent. As a non-polluting renewable energy, solar energy has the advantages of cheap, non-polluting and large reserves, and has attracted more and more attention. my country is rich in solar energy resources, especially in the western desert area, where solar energy resources and open space resources are abundant, so it is possible to develop large-scale solar thermal power generation. [0003] The tower-type solar thermal power generation system reflects solar ene...

Claims

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Application Information

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IPC IPC(8): G01K17/00
CPCG01K17/003
Inventor 魏进家靳亚斌方嘉宾屠楠
Owner XI AN JIAOTONG UNIV
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