A Method of Reversing Airgel Extinction Coefficient from Experimental Data of Airgel Glass

Abstract

The invention relates to a method for reversing aerogel extinction coefficient from aerogel glass experiment data and provides a method for calculating optical performance of aerogel. An aerogel glass optical model is rebuilt through an interface energy balance method, hourly radiation transmittance under each extinction coefficient is solved by combining hourly sun height angle, transmitted radiation total energy is solved according to experiment data, and squares of differences of hourly transmittance energy and the experiment data are summed; the aerogel extinction coefficient and the transmitted radiation total energy have a function relationship in one-to-one correspondence, so that the extinction coefficient with minimum errors is solved through a golden section method and is the extinction coefficient of aerogel under sunlight; a calculation result is proved to be still accurate and reliable at other time.

Description

technical field [0001] The present invention relates to the fields of airgel optical properties, airgel glass lighting, building load calculation, and building energy consumption simulation, and in particular to a method of back-estimating the effect of airgel on sunlight from the experimental data of airgel glass under natural climate conditions. Calculation method of the lower extinction coefficient. Background technique [0002] With the improvement of living standards, heating and air conditioning systems are widely used in new and existing buildings. The energy consumption of heating and air conditioning systems is increasing year by year, and its energy consumption accounts for 50-60% of the total annual energy consumption in public buildings. In building simulation, the solar radiant energy entering the room through windows accounts for about 65-80% of the cooling load generated by the building envelope in summer, so accurately simulating the optical performance of w...

AI Technical Summary

Problems solved by technology

However, when the material leaves the factory, only the vertical transmittance of the material is given, and parameters such as the extinction coefficient are not given, and the extinction coefficient cannot be measured in the laboratory alone, and only the vertical incidence of the airgel can be obtained in the laboratory. Spectral extinction coefficient

The energy distribution of sunlight is dominated by visible light and near-infrared rays, and the distribution is not uniform, so the process of obtaining the extinction coefficient under sunlight from the spectral extinction coefficient is also relatively complicated

Due to the complex microstructure of airgel, the scattering phenomenon of visible light with shorter wavelength is extremely complex and greatly affected by impurities, so it becomes very difficult to calculate the extinction coefficient theoretically.

Images