A method for measuring the solar energy absorption rate of samples to be tested

Abstract

The invention provides a method for measuring the solar energy absorption rate of a sample to be tested, comprising: step S1: using a spectrometer to measure the sun's thermal radiation spectrum; step S2: using an absorption spectrum device to measure the absorption spectrum of the sample to be tested; step S3: using the The thermal radiation spectrum of the sun is used as a weighted function to calculate the average value of the absorption spectrum of the sample to be measured, to obtain the volume absorptivity A of the sample to be measured v . The method for measuring the solar energy absorptivity of the sample to be tested in the present invention is based on measuring the radiation spectrum of the radiation source and the absorption spectrum of the absorbing substance to calculate the solar energy absorptivity of the sample to be measured, and the method can accurately cover the solar thermal radiation through the above two spectral lines Band, you can get 50000‑3000cm ‑1 The relative energy of sunlight within the wavelength range can be used to determine the volume absorptivity of the sample to be tested for solar thermal radiation according to requirements.

Description

technical field [0001] The invention relates to the field of solar thermal power generation, in particular to a method for measuring the solar energy absorption rate of a sample to be tested. Background technique [0002] Solar thermal power generation technology has received more and more attention and development, and molten salt has been widely used in the field of solar thermal power generation due to its excellent thermophysical properties and heat transfer and storage properties. Among them, using molten salt directly as a heat sink (direct receiver) is a very promising technology. [0003] In solar power generation technology, there is usually a special heat absorber. After absorbing heat, the heat is transferred to the heat transfer medium (molten salt), and then circulated in the loop. In the prior art, the molten salt can also be directly used as a heat absorber. At this time, the molten salt is also a heat transfer medium, so the working mode at this time becomes...

AI Technical Summary

Problems solved by technology

It is feasible in principle to use the power meter currently on the market to measure the bulk absorption rate of molten salt, but because the measurement wavelength range of the commercially available power meter is relatively short, such as 350-400nm, 500-700nm, etc., and the sunlight The radiation wavelength range is very wide, of which 97% of the energy is distributed between 200-3000nm, so the commercially available power meter cannot accurately cover the solar thermal radiation band, and the existing power meter is not suitable for measuring the absorption rate of molten salt body. The test results big error

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