Spectral Characteristics Of Translucent Media And Its Application In Radiative Cooling

With the development and progress of the present era,the energy consumption is increasing day by day,not only in terms of the needs of scientific and technological progress,but also in terms of people’s pursuit of a better life.In the system of energy consumption,fossil energy consumption accounts for a large part.As the limited resources on the earth,with the consumption of fossil energy,energy shortage is a big problem.In the process of energy consumption,the energy consumed by building temperature control plays an important role.Both 5G,which is more popular nowadays,and the air conditioning and refrigeration that people need every day,consume a lot of energy for active temperature control.At present,the radiative cooling film studied in this paper can be used as an auxiliary means of temperature control to reduce energy consumption.In order to study the radiation cooling film,the simulation calculation of the particle system,the optimization design of the radiation cooling film and the performance test of the actual radiation cooling film are carried out in this paper.Firstly,the simulation calculation of spectral radiative characteristics of particle system is developed.In this part,the calculation program is designed and verified by experiments.The results show that the program can be used to calculate the spectral radiative characteristics of two kinds of particles,and the results are reliable.In addition,the results show that the spectral radiative characteristics of the particle system with two kinds of particles change greatly with the volume fraction of the two particles.Then,the optimal design and calculation of the film are carried out.This part includes the refractive index of particles,the refractive index of matrix,the particle size and the total volume fraction.It shows that there are different particle sizes in different wavebands to meet different needs.Then it shows the impact of the change of atmospheric environment on the calculation results.In general,the diameter of 1 μm is more suitable in the near infrared band,and 4 μm is more suitable in the atmospheric window band.At last,the experiment of radiative cooling property of acrylic resin film with single silica particle and the simulation calculation of spectral radiative property of acrylic resin film with two kinds of silica particle are carried out.In the performance experiment of radiation cooling film with single particle,it is found that the film has a very high transmittance in the visible light band,and a very high emissivity in the atmospheric window band.In the specific radiation cooling performance experiment,it is found that it has a good cooling effect in the daytime.In the simulation process of acrylic resin film containing two kinds of particles,it is found that the simulation results change greatly with the volume fraction of particles,and change regularly with the total volume fraction.