Heat And Moisture Transfer Performance Of Composite Polystyrene Particles Of Insulation Mortar And Its Impact On Building Energy Consumption

Insulation performance of building envelope is an important aspect of energy-saving construction.Heat and moisture transfer of material impact on the thermal and insulation performance of the building envelope,the law of the influence is an important direction of energy-saving research.Moisture absorption,the thermal conductivity and heat and moisture transfer and and their effects of compound EPS insulation mortar in different wet conditions.And then function of thermal conductivity of material in different wet state be launched from Luikov's mathematical model of coupled heat and moisture transfer and one-dimensional partial differential equations of heat and moisture transfer,Specific factors of function be determined according to the thermal insulation structure and it's working physical characteristics which commonly used in the region of hot summer and cold winter, and be checked through the experiment results.The function of thermal conductivity be used in simplified model of the thermal environment simulation DEST,and the influence of heat and moisture transfer bring to building energy consumption be analysised.The establishing of thermal conductivity function,can providing more realistic basic parameters for simulation of building energy consumption,and providing more effective technical guidance for building energy-efficient designing, construction,materials choosing.The article is researched main about:(1)Different formula of compound EPS insulation mortar be designed through adjust cement cosumption,water-cement ratio,perlite consumption,size distribution of EPS grains and thin sand consumption.Porosity,hygroscopic coefficient and specific absorption of different formula be researched based on experiment. Experiment results show that increasing of the proportion of hydrophilic material,and increasing of continuous,through,opening macropores because of unreasonable formula will increase the hygroscopicity of mortar.Determined the wet rate changing of mortar because of the influence of the initial rate of wet and weather conditions in region of hot summer and cold winter by experiment.(2)The thermal conductivity of compound EPS insulation mortar of different formula be researched in wet state like the materials in conditions of region of hot summer and cold winter,the law and degree of thermal conductivity of compound EPS insulation mortar be affected be analysised.Within the scope of the raw materials studing in this paper,the thermal conductivity in wet state of compound EPS insulation mortar with bigger thermal conductivity and density of dry state changed obviously,The same,the wet rate and hermal conductivity in wet state changing obviously when perlite added.(3)The foundation function of instantaneous physical parameters of thermal properties on the temperature and humidity be launched through the reverse derivation to the equations main controlled by Luikov's.Order of the coefficient about the rate of instantaneous thermal conductivity be affected by the instantaneous changes in humidity asδ_ω.Expressions ofλ(U)andδ_ωbe determined based on One-dimensional partial differential equations of heat transfer,moisture transfer and experimental datas of thermal conductivity of compound EPS insulation mortar in wet state.The coefficientδ_ωof the functionλ(U).And deduct applicable forms of universal material,which is a function related to the thermal conductivity and density of dry material.(4)According to the characteristics that building energy consumption be affected by the thermal conductivity of envelope structure.The mathematical model of building energy simulation software DEST be simplified.Differences of building energy consumption of the calculation of thermal conductivity provided by the norms and the thermal conductivity function derived in this paper respectively be calculated and compared in the same boundary conditions.The results show that 13.25%of the building energy consumption be maded the thermal conductivity of materials in different wet state it can not be ignored.