The Reesearch About The Effects Of Building Exterior Wall Vertical Greening On Temperature Of The Building Exterior Wall And Energy Consumption Of The Building

In recent years,global energy and environmental issues have a high degree of concern.Much of the energy that we use today is the fossil fuel that the earth has accumulated over millions of years,but these fossil fuels are becoming less and less.On the other hand, the construction of urban construction is more and more,green space is becoming less and less.Building exterior wall vertical greening is a very good kind of green forms,it can to some extent alleviate the shooting two birds with one stone of energy and environment problems.This article research on the problems from the following several aspects:Firstly,survey and study the development of vertical greening in China and abroad,reading the literature to understand the research results of this topic in the domestic and foreign in current stage.Secondly,field monitoring a vertical green office building in Nanchang,through the analysis of the monitoring data, concluding that the vertical greening effect on the external surface temperature of the building exterior wall, the external surface temperature, the solar energy absorption and so on,determine the climatic parameters,vegetation parameters and building model parameters for modeling use.Thirdly,using energy simulation software De ST building energy consumption simulation model based on field building,studying the effect of vertical greening on the energy consumption of an office building in Nanchang.Fourthly,using energy simulation software Design Builder to build building models of different aspect,such as different building types,different number of external walls,transparency of different external walls,different external walls,different types of external walls.The effects of vertical greening on thermal energy and energy consumption of buildings under different parameters of building model and different vegetation parameters were analyzed.Finally come to the conclusions.Firstly,based on experimental analysis,the outer surface temperature of the outer surface of the outer wall of the vertical greening is 4℃ lower than the outer surface exposed outer wall.In extreme cases, the temperature is reduced by more than 10℃.In a building with a load of air conditioning and a constant temperature,the inner surface temperature of the outer wall of the vertical greening is lower 1℃~2℃ than that of the external wall with no vertical greening.Secondly,according to the model simulation calculation analysis,vertical greening to make the construction model of the unit area of the maximum cooling load index decreased by 11.85W/m2.Total air conditioning load reduced by 30541 KWh,total air conditioning load reduced by 5.6%.Thirdly,according to the model simulation calculation analysis,the leaf area index was LAI3 the vertical greening cold load was the most,the leaf area index was LAI2 the vertical greening cold load was the second,the leaf area index was LAI1 the vertical greening cold load was the less.The greater the leaf area index of green vegetation, the better the energy saving effect of vertical greening.The vertical greening of residential building energy saving effect is better than the energy efficiency of office buildings.Fully opaque external walls have the best energy saving effect,60% opaque walls of the energy saving effect will be reduced.The smaller the external wall windows, the better the energy saving effect of vertical greening.Building toward the vertical green energy saving effect has a significant impact,to the west, East and south walls of the vertical greening better energysaving effect,north to the vertical green energy saving effect is small.External wall material on the vertical greening energy-saving effect has a greater impact,the poorer the insulation of the building, the better the energy saving effect of vertical greening.The effect of absorption coefficient of external wall on the energy-saving is also effect of vertical greening,surface absorption coefficient of the construction of large vertical green energy-saving effect is good.