A Phase Change Material Based Heliostat Structure and Its Design Optimization Method

Abstract

The invention relates to a heliostat structure based on a phase-change material and a design optimization method of the heliostat structure. The design optimization method comprises the following steps of S1, calculating the heliostat field efficiency of a heliostat according to parameters of the heliostat, parameters of a heat absorber and parameters of a working medium; S2, calculating the heatefficiency of the phase change layer working medium according to the mirror field efficiency; S3, calculating to obtain the thickness of the phase change layer in a thermodynamic iteration mode; S4, on the basis of the mirror field efficiency, the phase change layer working medium heat efficiency and the phase change layer thickness obtained through calculation in the steps S1-S3,optimizing and screening different input heat exchange tube parameters based on a database-neural network algorithm, wherein the calculation, iteration process and optimization screening process of the steps S1-S4 areall realized in three-dimensional modeling software. According to the optimization method provided by the invention, the parameters of the heat exchanger can be subjected to an optimization process related to the heat efficiency before the heliostat structure is actually produced, so that the optimal design scheme is screened out, and data support is provided for subsequent design and productionof the actual structure.

Description

technical field [0001] The invention belongs to the technical field of solar energy applications, and in particular relates to a heliostat structure based on a phase change material and an optimization method for its design. Background technique [0002] A heliostat is a flat mirror device that directional projects sunlight, and is widely used in the field of solar energy application technology. Sunlight gathers thermal energy into the heat absorber through the reflection of the heliostat, and uses high temperature to heat the working medium in the heat absorber to drive the generator to rotate, and realize photoelectric conversion to generate electric energy. Due to the long-term exposure to strong solar radiation, and in order to better reflect the sunlight, it is necessary to adjust the steering or focus according to the position of the sun to "track the sun", the surface temperature of the heliostat is high and the thermal stress is high for a long time The uneven state...

AI Technical Summary

Problems solved by technology

After testing the existing technology, it is found that the design of the heliostat still has the following defects: the change of the structural parameters of the heat exchanger will affect the thermal efficiency of the heliostat, and it is impossible to accurately manufacture the optimal product in the actual structural design and production ; Heliostats are exposed to harsh high-temperature environments for a long time, and local high temperatures will lead to uneven heating of the mirror surface of heliostats, greater thermal stress, and shortened service life, resulting in a decline in the economy and safety of the power generation system; The obtained solar radiation removes the reflected part, and the remaining energy is not well utilized, resulting in a certain amount of energy loss

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