Simulation Of Thermal Performance Of Fly Ash Energy-Saving Wall Panel Modified With Nanomaterials In Assembled Buildings

China is in the process of rapid urbanization.With a total area of more than 60 billion square meters,China is expected to add another 30 billion square meters of building area by 2020.Energy-saving emission reduction is a basic national policy of our country,building wall insulation technology research has become the key technology of building energy efficiency.This project uses industrial solid waste,fly ash,which causes serious environmental pollution.In the project 2016,the Hubei Provincial Science and Technology Plan Project “Study on Production of Lightweight and Energy-saving Composite Wallboard of Nanomaterial Modified Fly Ash”(Project Number: 2016 On the basis of-347-1-13),and the nanometer-material modified fly ash foam concrete thermal insulation material developed by the previous research group was based on the simulation object.Using finite element simulation technology and energy simulation technology,the nanomaterials were studied.Thermal Insulation Effect of Fly Ash Lightweight Energy-Saving Wallboard and Nano-material Modified Fly Ash Foamed Concrete Insulation Materials in Assembled Buildings and to guide the actual project.This article mainly uses the nanometer material modified fly ash foam concrete insulation material as the simulation object,uses the simulation and the experimental solution research method,through COMSOL finite element software,imitates the nanometer material modified fly ash foam concrete as the assembled type wallboard and The thermal performance of the insulation layer;Through the PKPM PBECA energy-saving calculation software,simulate the energy performance of nano-materials modified fly ash lightweight energy-saving wall panels in fabricated buildings.Draw the following conclusions:(1)The nano-modified fly ash foam concrete material is used as a 150 mm thick assembled wallboard,which has a significant suppression effect on heat flux during the thermal simulation process.Under the conditions of air-conditioning heating in summer and air-condition cooling in summer,the wall enclosure The temperature difference between the inner surface temperature of the structure(17.45°C in winter and 26.25°C in summer)and the indoor temperature(18°C in winter and 26°C in summer)is less than 6°C.(2)The nano-modified fly ash foamed concrete material is used as a 40 mm thermal insulation layer and shows a good thermal insulation effect in the thermal simulation process.Under the conditions of air-conditioning heating in summer and air conditioning and cooling in summer,the temperature of the thermal bridge at the building site is: Site(in winter 13.65°C,summer 27.65°C),column(in winter 13.35°C,summer 27.75°C)and roof bearing layer(in winter 14.65°C,summer 30.95°C),thermal bridge temperature is greater than the indoor dew point temperature(winter 10.1°C,17.6°C in summer,avoiding condensation.(3)The nano-modified fly ash lightweight energy-saving wallboard is applied to a multi-layer fabricated building.Through energy simulation,the total energy consumption of the multi-storey assembled building is 59881 kwh,which is equivalent to that of the reference building of the 1980 s.Comparing the total energy consumption(86237kwh),it was found that its energy-saving efficiency was 65.28% and met the standard requirements.