| Global warming is an established fact.It is bound to have an impact on building energy consumption.With the continuous development of China’s urbanization process,the total amount of energy consumed by buildings in the process of generation and use is rising,resulting in increasingly serious urban heat island effect and seriously affecting people’s production and life.Therefore,it is imperative to implement building energy conservation and emission reduction.The heat transfer energy consumption of building maintenance structure accounts for a large part of building air conditioning energy consumption,and the building roof,as an important component of building envelope,has been ignored and unused.Green roof is an effective way to deal with climate warming,alleviate urban heat island and reduce building energy consumption.Therefore,this paper carried out in the future climate conditions,different types of buildings in Jinan area using green roof on building energy consumption simulation analysis.Firstly,a building of Jinan City was selected to carry out green roof experiment,and the vertical outdoor air temperature,leaf surface temperature,soil layer surface temperature,roof outer surface temperature,roof inner surface temperature,indoor air temperature and air conditioning power consumption of green roof were measured and analyzed.The results show that the temperature change range of the inner surface of the roof with roof greening is smaller and more stable than that without roof greening;compared with the highest outdoor air temperature on the same day,the temperature of the inner surface of the roof,the surface temperature of the leaves of the green roof and the surface temperature of the soil layer are delayed in the phase when the maximum value is reached on the same day,among which the inner surface of the roof without roof greening When the temperature reaches the maximum value on the same day,there is a delay of about 1-2 hours on the phase,while when the temperature of the inner surface of the roof with green roof reaches the maximum value on the same day,there is a delay of about 5-6 hours on the phase.Secondly,the energy simulation software Energy Plus and the theoretical model of green roof are introduced,and the accuracy of the theoretical model is verified by the above experimental results.The average deviation error(MBE)of all simulation results is 3.70% ～7.62%,which is less than 10%,and the average root square error(RMSE)is within 4.57% ～10.81%.Therefore,Energy Plus is reliable in predicting and simulating the thermal performance of green roofs.Four different types of buildings are established by using Energy Plus,which are office building,kindergarten building,shopping mall building and residential building,respectively,to simulate and analyze the building energy consumption under future climate conditions.Then,the generation method of future meteorological documents is introduced.According to the "deformation" method and combined with Had CM3 and A2 scenarios provided by the Intergovernmental Panel on climate change(IPCC),the paper takes CSWD(Chinese standard weather)of Jinan as an example Data(CSWD)and the actual hourly meteorological data for five consecutive years from 2015 to 2019 are the "base year" meteorological data,the typical annual meteorological data for 2050s(2040-2069)and 2080s(2070-2099)in the future,as well as the meteorological data for five consecutive years from 2045 to 2049 and five consecutive years from 2075 to 2079,so as to be used for building energy consumption simulation under future climate conditions.Finally,the energy consumption simulation software Energy Plus is used to simulate and analyze the energy consumption of four kinds of green roof buildings by using the future meteorological data files of Jinan City,and the influence of key parameters on building energy consumption and the best parameter configuration of energy saving effect of different types of green roof buildings under the future climate conditions are obtained.For office buildings,kindergartens and shopping malls,under the climate conditions of 2050 s,the three vegetation heights have good energy-saving effect.When the soil thickness is 0.1m,LAI is 5,the building energy-saving effect is the best;under the climate conditions of 2080 s,when the vegetation height is 0.1m,the soil thickness is 0.1m,LAI is 5,the building energy-saving effect is the best.For residential buildings,under the climate conditions of 2050 s,the three vegetation heights have good energy-saving effect,when the soil layer thickness is 0.2m,LAI is 5,the building energy-saving effect is the best;under the climate conditions of 2080 s,when the vegetation height is 0.1m,soil layer thickness is 0.3m,LAI is 5,the building energy-saving effect is the best.The research provides a theoretical support for different types of buildings in Jinan on how to configure green roofs under future climate conditions. |
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