Study On Thermal Properties Of Ligheweight Fired Shale Brick And The Masonry

At present, the consumption of building construction's energy is seriously, nearly35%of the totalsocial energy consumption.In variety of building energy consumption, energy consumption of heattransfer in building envelope is57%-77%of total building energy consumption. So the energy savingresearch in builing envelope is particularly important. In response to the country's energy policy, ourresearch group has long been engaged in lightweight sintered shale brick and city sewage sludge shalebrick in development and spreading. Not only to take advantage of the abundant shale resources inGuangxi autonomous region,but also efficiently use of construction waste,agricultural waste,andprotect the land. In recent years our research group have Completed the reserch and related mechanicaltest on the shale brick.In order to highlight the advantages of lightweight sintered shale brick in energy efficiency,on thebasis of the above work, the paper have done the following tasks and got relevant conclusions:(1) Establishing different porosity, pore form and arrangement of the holes in lightweight sinteredshale brick.Using the finite element method analysis to explore porosity, pore form and arrangement ofholes models of various brick thermal performance on the thermal conductivity of the brick. It can begot that: the thermal conductivity decreases with the increasing of hole ratio; and with the same holeratio and holes arranged, the thermal conductivity of rectangular hole brick wall is less than thecircular holes; staggered holes form can extend the heat transfer path effectively, reducing the thermalconductivity of brick.(2) Building three walls by lightweight sintered shale brick with the circular hole and the rectangularhole brick. Including vegetarian brick wall, both sides with surface mortar, one side with plaster mortar,the other side with polystyrene plates. With the guard hot box detect the specimens' heat transfercoefficient. It can be got that: rectangular hole brick wall thermal conductivity is less than round holebrick wall brick wall, for the same kind of brick walls, less the thermal conductivity of the wall surfaceof the material is,less the heat transfer coefficient of the entire wall.(3) Using the finite element analysis program establish the thermal analsis model, getting the walltemperature distribution figure and heat flux density distribution figure. It can be got that: less thethermal conductivity of the surface material is, less the heat flux through the wall surface, but thesurface of the thermal stability is worse; with the same structure, heat flux through rectangular holebrick wall surface is smaller, temperature difference between the hot and cold sides is larger.(5) Comparing the theoretical results,guard hot box test results, and simulation results to analyze thefactors that generating errors. And proposed that combination the guarded hot box method with finiteelement simulation to analyze the wall heat transfer.