Study On Thermal Insulation Performance Of Assembled Monomer Building Based On Electric Ground Heating

At present,the situation of resource waste and energy shortage in China is still not optimistic.The shortcomings of traditional civil construction industry,such as high energy consumption,long construction cycle and serious waste of resources,can not meet the current social development trend.In recent years,with the gradual rise of assembly buildings,building cycle and energy consumption have been greatly reduced.Starting from the national policy level and people's demand for quality of life,it will be of great significance to research and develop new materials for assembled building and their application,as well as to conduct in-depth research on the impact of related supporting products on the overall thermal insulation and energy-saving effect of buildings.Based on the project of production,teaching and research platform(assembled monomer building)built by University and enterprise,the thermal insulation characteristics of assembled monomer building and traditional concrete building are deeply analyzed and studied by establishing theoretical model of energy consumption analysis and CFD method combined with experimental measurement scheme.The research contents of this paper are as follows:(1)According to the physical parameters of the assembled monomer building model and concrete model,the theoretical energy consumption model is established and solved by DeST energy consumption analysis software.The main conclusions are as follows:1)The energy consumption of the new wall model of the assembled monomer building is lower than that of the concrete model in the whole year,the energy saving rate can reach 29%,and the cumulative energy saving amount is 7500 kW·h;2)the thermal load of the monomer building is 1800 W and the ground heating is 1 800 W.The effective heat dissipation per unit area of the system is 124.2 W/m~2,which is only4.2 W/m~2 different from the indoor heat index per unit area,and the error is only 3.5%.(2)In order to further compare and analyze the thermal insulation performance of the two models,numerical simulations based on CFD software are carried out.The following conclusions can be drawn:1)During 24 hours continuous working period,the new wall model experiences about 15 start-stop cycles,and the concrete model experiences about 12 start-stop cycles;2)The new wall model achieves the first indoor goal in the pre-heating and heating stage.The floor temperature is about 32.5?when the standard temperature is controlled,and 33.6?when the concrete model reaches the initial indoor setting temperature.3)From the wave characteristic curve,it can be seen that the response speed of the new wall model is faster than that of the concrete model,and the ideal target temperature control effect can be obtained more quickly in the same time interval.4)Most of the two models as a whole.The regional air velocity is low,and the human body has no sense of blowing.(3)Through the actual measurement of the experimental model,the differences of thermal insulation performance between the two models are further compared and analyzed.The main conclusions are as follows:1)The experimental values of the two models are basically consistent with the trend of the simulated predicted values.The experimental values are slightly lower than the simulated values about 1?,and the temperature rise time of the simulated values to the set temperature is slightly lagging behind the experimental values.The experimental temperature at the height of 1.2 m of the model layer reached 20?at a time point of about 132 minutes,with a lag of about12 minutes.The temperature value of concrete model at 1.2 m storey height reaches the set temperature point about 180 min,which lags behind the simulation value about 10min.The new wall model still shows a faster warming trend than the concrete model.2)After calculating the average temperature of the measured points of the two models,the average temperature of the measured points of the concrete model is 17.9?.The new wall model is 20.1?.The new wall model is 2.2?higher than the concrete model.The research results of this paper have the following meanings:to promote the practical application of new technology and new methods in heating mode,which can effectively reduce the energy consumption of the whole life cycle of buildings and promote the effective implementation of energy saving and emission reduction policies in China;to provide theoretical reference for more energy-saving and comfortable assembly building design,to reduce the energy consumption of heating in winter,and to make people's living environment more livable and comfortable.