Effect Of Vertical Temperature And Humidty In Summer On Human Comfort In Nanjing

With the rapid economic development,the process of urbanization accelerated,unsustainable consumption lifestyle has brought great ecological environment pressure and influence,air pollution,foggy,water shortage and other environmental problems have become increasingly prominent.Vertical greening has great advantages in increasing urban greening area,alleviating urban land shortages,managing urban pollution and haze.In recent years,vertical greening in the process of urban development in the status of continuous improvement,more and more vertical green emerged in the city.Promote the development process of vertical greening will be conducive to the construction of ecological nature and sustainable cities,also provide people with a more comfortable living environment.This paper mainly discusses the effect of vertical greening on human comfort.The artical carries out four asparts in the background research,the investigation and the research,the field test and the case design.Background research mainly elaborates the significance of this study,the research content and purpose,the research status at home and abroad.The investigation and analysis of related vertical greening investigation and human comfort questionnaire survey,vertical greening status in Nanjing area as the research object,the construction status of field investigation of current vertical greening and it is in Nanjing existing problems and puts forward the corresponding development suggestions.The study of human comfort was based on the questionnaire survey and the human body comfort degree PMV-PPD index.Based on the climatic environment of Nanjing in summer,the human body comfort condition was discussed from the aspects of human damp heat feeling,hot and humid expectation and human comfort.At the same time,seven parameters are introduced into effect of human comfort,to test the four environmental factors that they are the ambient temperature,mean radiant temperature,wind speed and relative humidity.MATLAB software was used to calculate the PMV of human comfort thermal sensation and the PPD index for predicting the dissatisfaction rate.The study found that air conditioning environment,the implementation of green wall can reduce the indoor temperature of 1.4℃,fluctuation of the indoor temperature at 28 degrees and the human comfort degree is higher.When the temperature is lower than 28 ℃,human thermal sensation PMV<1,dissatisfaction rate PPD<27%,to meet the norms of the comfortable environment range-1≦PMV ≦ +1,PPD ≦ 27%.No air conditioning in the natural environment,high temperature reduce the human comfort.The implementation of vertical greening,can reduce the indoor temperature,increase air humidity and improve indoor human comfort.Field tests were conducted on three test sites of commercial buildings,office buildings and campus buildings,grouping test air temperature and relative humidity,thus study the effect of vertical greening on human comfort.Test analysis shows that comparing with the bare green building walls,the implementation of vertical greening can reduce the air temperature and the indoor and outdoor temperature difference.The cooling and moistening effect of vertical greening weakened with the increase of distance from greening wall.Different ecological benefits of different green forms,grid type vertical greening and the wall to form an air passage between the layers,the wind picks up moisture evaporation,the air humidity is low.Compared with grid type vertical greening,vertical greening plants with modular coverage and the more intensive cultivation medium,greatly increase the indoor air humidity and lower air the temperature has certain advantages in improving the human comfort.The planting range of greening plants also affect human comfort,the test of wooden building northeast wall temperature is slightly higher than that of the northwest,Southeast of office building is higher than the temperature of the southwest,combined with the characteristics of Nanjing that in summer has more southeast wind,in winter has more northeast wind and the building south has multi-solar radiation.So,the wall design should consider the layout of vertical greening on the south facade of building,thereby reducing the solar radiation,the maximum cooling effect.The Case design to Nanjing T80 science and technology culture international community building for the simulation wall,the design of the early use Ecotect software to analysis solar radiation intensity,sunshine hours,radiation analysis on the wall in order to determine the plant configuration contours,combined with the Nanjing area commonly used Vertical green plants,23 kinds of green plants to determine the vertical green wall design.In this paper,through the field test,the vertical greening of the technical form,orientation and orientation,cultivation of the substrate,plant selection are affecting the indoor temperature and humidity conditions,thus affecting human comfort.So,vertical green design should be combined with specific environmental considerations.At the same time,this paper proposed the use of simulation software for climate analysis and combined with plant characteristics,the vertical design of the green wall design of the passive design.It is expected that this paper can provide some scientific basis and reference for the vertical greening design of Nanjing and Yangtze River Delta.