Study On The Insulation Thickness Optimization And Economy Of Aerogel Building Insulation Materials

The application of insulation materials can reduce wall energy consumption effectively,is an important guarantee for the development of green and near-zero-energy buildings.At present,the insulation materials exist problems such as poor insulation performance,low energy saving efficiency,poor economy and etc.Therefore,with the urgent need of the insulation material market,the development and application of high-performance insulation material need to consider its thermal performance,economy,applicability and environmental benefit comprehensively.To guarantee the thermal design of building envelope in summer and preservation in winter,a typical building model of three storey office buildings in this area was established.The thermal performance parameters of composites wall was analyzed and the thermal performance parameters of five kinds of insulation materials used to analyze were obtained by experimental tests.The calculation model for optimization of building insulation material thickness and investment cost was established based on the degree day(DD)and the total life cycle cost method(LCC).The economic parameters such as the optimum insulation thickness,investment cost,payback periods and energy savings of new aerogel insulation material were calculated.And a comparison was extend to four conventional insulation materials XPS,EPS,polyurethane foam,and glass fiber.The results showed the optimum insulation thicknesses of XPS,EPS,polyurethane foam,glass fiber and new aerogel insulation materials are 49.0,73.0,43.0,47.6 and 4.9 mm which applied to aerated concrete walls,respectively.New aerogel insulation material with minimal optimum insulation thickness.And the best applicability and economical efficiency for aerated concrete wall.Besides,as the price of aerogel insulation materials decreased,the optimum insulation thickness and optimum energy savings increased,whereas the total cost in the optimum insulation thickness,payback periods,greenhouse gas emissions decreased.The research results showed that the economic and environmental benefits of new aerogel insulation material are remarkable as the prices of aerogel insulation materials continued to decrease.Therefore,reducing the price of aerogel material is an important driving force to promote the building energy-saving application of aerogel insulation materials.Based on the mathematical model of whole life cycle energy consumption and cost of insulation materials.The economic parameters such as energy consumption,optimum insulation thickness,costs,payback periods and economic benefits of insulation materials during the life cycle stage of production,operation,transportation,and disposal were calculated.It is showed that the maximum energy consumption stage is the operation stage.Followed by the manufacturing and transportation stage.And the optimum insulation thickness of XPS,EPS,polyurethane foam,glass fiber and new aerogel insulation materials in the whole life cycle were 36.6,72.4,37.6,27.1 and 2.1 mm for aerated concrete,respectively.It can be seen that the optimum insulation thickness of insulation material in the whole life cycle is smaller than that obtained by the conventional analysis methods.Also,the new aerogel insulation material still corresponds to the lowest optimum insulation thickness.Finally,energy consumption simulation software DeST-c is used to investigated the energy saving effect of building composite walls.The optimum insulation thickness of 6mm aerogel insulation materials and 41 mm XPS insulation materials were applied to the external insulation of a typical building wall.The results showed the application of optimum insulation thickness for XPS can achieve energy saving rate of 11.6%,26.8%,and the application of optimum insulation thickness for aerogel insulation materials can achieve energy saving rate of 7.5%,18.2% in summer and winter,respectively.It is indicated that the application of optimum insulation thickness of insulation material can reduce energy consumption effectively and achieve building energy conservationBased on the above conclusions,the application of aerogel insulation material has good perfomance advantages,significant economic and environmental benefits in the external wall insulation in the hot summer and cold winter zone.The research results are of great significance to promote the energy-saving application of aerogel insulation materials in the insulation field of building wall.