Measuring the spectral emissivity of single particle at high temperature

It has a very broad prospect to use solid particles as the working medium in the solar collector of concentrated solar power generation system. The emissivity of a particle has an undeniable effect on the efficiency of a solid particle receiver. However, the spectral emissivity of a single particle at high temperature is rarely reported. In this work, an experimental method for measuring the spectral emissivity of a single particle at high temperature is established. This method is based on a self-designed heater, Fourier transform infrared spectrometer (FTIR) and a blackbody furnace. It can measure the spectral emissivity of a single particle at high-temperature of 500-900 degrees C, and the test wavelength range is 2.5-25 pm. By measuring the spectral emissivity of 3-5 mm diameter particles, the influence of particle size on the emissivity was obtained. The expanded uncertainty of spectral emissivity of 3 mm SiC particles at 800 degrees C is 1.380%.

Automated summary

Using solid particles as the working medium in concentrated solar power generation system has a promising future. This study establishes an experimental method for measuring the spectral emissivity of a single particle at high temperature and investigates the influence of particle size on emissivity.