Study On Insulation Materials Expanded Perlite Filled With Aerogel And Analysis Of Its Building Energy Consumption

With the rapid development of human society,energy issues become increasingly prominent.According to the Science and Technology Department of the Ministry of Housing and Urban-Rural Development,the proportion of building energy consumption in China will rise to 35% as the urbanization process accelerates.The effective use of national resources and sustainable development of economic are affected by building energy consumption.Given that building energy efficiency is the main measure to reduce building energy consumption,a number of laws and regulations related to building energy conservation are issued by the Chinese government.The world's leading material aerogel with extremely low thermal conductivity is combined in this paper.Aerogel is combined with expanded perlite to form expanded perlite filled with aerogel.The thermal conductivity of the grading and non-grade expanded perlite cementitious materials filled with aerogel are compared,and a numerical model is established to simulate the effect of particle size gradation of expanded perlite filled with aerogel-in heat transfer,the heat transfer law of expanded perlite cementitious materials filled with aerogel is derived.According to the characteristics of expanded perlite filled with aerogel,the building thermal insulation material is developed,the thermal conductivity and mechanical properties of the new thermal insulation material is tested.The annual heating energy consumption value of the aerogel-expanded perlite insulation material enclosure under the meteorological parameters in Taiyuan is calculated to be 57.45 kWh/m2,which is significantly lower than that of the general envelope construction of 109.90 kWh/m2.The main research content of this paper are as follows:(1)Different silicon sources,acid-base catalysts and modified displacers are used to develop aerogel with low thermal conductivity.The prepared silica aerogel is characterized,the test results is compared,the effects of silicon source type,acid-base catalyst,gel time,volume ratio of silicon source reagent and deionized water,composition and ratio of modified replacement solution on aerogel properties are studied.The ways to make silicic acid solutions and adjust their pH are explored.The quality of silicic acid absorbed by expanded perlite with different particle size in different vacuum pressure environments for different vacuum time are analyzed,and the optimal vacuum pressure and duration are selected.The thermal conductivity of expanded perlite and expanded perlite filled with aerogel are tested to verify the effect of aerogel on reducing the thermal conductivity of expanded perlite.(2)The particle size grading combination parameters of expanded perlite filled with aerogel are determined by uniform experiment and linear regression analysis.The thermal conductivity and mechanical properties of gradation and non-grade expanded perlite cementitious materials filled with aerogel with different water-cement ratios and different volume ratios are tested and studied.According to the different particle size grading combination and volume ratio of expanded perlite filled with aerogel,the heat transfer model is established by MATLAB,and the heat transfer law of expanded perlite cementitious material filled with aerogel is analyzed.The comparison shows that the model reflects the heat transfer law of the composite.(3)Expanded perlite filled with aerogel is used for lightweight concrete and insulation boards,and its physical and mechanical properties are determined.Single factor test and orthogonal test are used to analyze the influence of the amount of admixture and gelling material on the thermal conductivity and mechanical properties of the thermal insulation material.Lightweight concrete with a thermal conductivity of 0.062 W/(m·K)and a thermal insulation plate with a thermal conductivity of 0.045 W/(m·K)are obtained by changing the variables.(4)According to the characteristics of building materials expanded perlite filled with aerogel,it is combined with the inner and outer walls,floor and roof of the building envelope to compare with the thermal insulation performance of ordinary building materials.The energy consumption formula is used to calculate the energy consumption of a single room in a building,the heat consumption of the expanded perlite filled with aerogel insulation material retaining structure and the expanded perlite insulation material retaining structure are compared.The energy consumption model is established.The energyplus software is used to simulate the energy-saving effect of expanded perlite filled with aerogel for office buildings and their single rooms.The building energy consumption parameters are compared based on the meteorological information from different regions,the suitable geographical area of expanded perlite building materials filled with aerogel are determined.