Method for calculating energy flow density distribution of focusing light spots of tower type solar heat absorber

A technology of solar heat absorber and energy flow density, applied in the direction of design optimization/simulation, etc., can solve the problem of long calculation time, and achieve the effect of reducing the amount of calculation, reducing the calculation time, and improving the calculation efficiency

Active Publication Date: 2020-01-17
HOHAI UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] Since the total heliostat area of ​​the solar tower thermal power station is tens of thousands of square meters, the existing methods for predicting the energy flux density distribution of the focused spot of the tower solar absorber generally take a long time to calculate

Method used

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  • Method for calculating energy flow density distribution of focusing light spots of tower type solar heat absorber
  • Method for calculating energy flow density distribution of focusing light spots of tower type solar heat absorber
  • Method for calculating energy flow density distribution of focusing light spots of tower type solar heat absorber

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Embodiment

[0098] The heliostat field of the solar tower power station is composed of 10,000 surfaces 100m 2 (10m 2 ×10m 2 ) composed of heliostats. Among them, each heliostat is composed of several square mirrors with a certain curvature, and finally forms a large reflective arc.

[0099] In the present invention, the vernal equinox is selected as the simulated calculation date of the system.

[0100] In order to analyze the detailed energy flow distribution characteristics of the inner surface of the heat absorber, the three moments of nine o'clock in the morning, noon and three o'clock in the afternoon are selected as the research objects of the time points, and the DNI values ​​​​of the three moments are calculated by using formula (6): 853.90, 974.16 and 853.90W / m 2 , and then calculate P at three moments according to formula (5)n (t), and calculate f at three moments according to formula (7) n . Then adopt the energy flow density superposition method of the present invention ...

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Abstract

The invention discloses a method for calculating energy flux density distribution of focusing light spots of a tower type solar heat absorber. A heat absorber focusing light spot energy flux density dynamic simulation model of a tower type solar heliostat field is established by utilizing a heat absorber light spot equivalent model. According to the average energy flow density in the conical surface of the projection light of the heliostat, based on coordinate rotation transformation and energy superposition, energy flow density values on grid points of the receiving surface of the heat absorber are obtained through conversion, and then energy flow density distribution of the heat absorber is obtained. By adopting the method, the energy flow density values on all grid points do not need tobe directly calculated, so that the calculation amount is effectively reduced, the calculation duration can be effectively shortened, and the calculation efficiency is improved.

Description

technical field [0001] The invention relates to a calculation method for the energy flow density distribution of a focused light spot of a tower-type solar heat absorber, and belongs to the technical field of heat absorber optimization design. Background technique [0002] There are two basic types of heat sinks in solar tower thermal power generation systems: external heat sinks and cavity heat sinks. The external heat sink is an open heat absorption cavity, the accumulated heat is absorbed to the surface of the heat sink, and the heat is transferred to the heat transfer fluid through the coating and covering layer. The amount of heat transferred is largely dependent on the surface and thermal conductivity of the pipes covering the working fluid. For example, if the thermal conductivity of the pipe is low, the large thickness will result in high temperatures on the outer surface, which will increase heat loss. In the cavity type heat sink, the heat absorption surface is l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20
Inventor 郭苏金懿豪王嘉乐纪文佳
Owner HOHAI UNIV
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