Research On Climate Zoning Evaluation Of Urban Building And Its Effect On Building Energy Consumption

There are innumerable connections between energy consumption of the buildings and climate,and climate is one of the most important factors in the early formation of architectural design style and development.The development of the city damage the original natural environment and climate.Urban climate has high formation temperature,wind speed is slow,weak solar radiation and more precipitation characteristics,This in turn creates a unique climate.Classifying urban building climate can clear and efficient study climate of research area between common characteristic and difference.The impact of people's daily work and life on the climate is becoming increasingly apparent in current society.Development and utilization of cities is one of the main causes of global climate change.But different regional development situation of climate change are not also similar.According to the long-term trend of urban climate and climate characteristics,classifying the existing urban climate,establishes a comprehensive evaluation system of urban climate,and thus provide effective advice for building energy efficiency design.There are the important content of the study.This study mainly focuses on the following four aspects:(1)In this study,choose long-term history data and meteorological data as a benchmark,Xi 'an as the research object,using linear tendency estimate the least-square method and the Mann-Kendall count trend analysis and mutation analysis.The found significant climate change in Xi 'an in 1997.Based on climate characteristics and mathematical model,urban building climate classification in dexes in Xi 'an were selected.(2)In the study of urban building climate zoning,it is particularly important to choose appropriate zoning methods.The clustering algorithm based on segmentation and the clustering algorithm based on hierarchy are used to classify the summer urban building climate in Xi 'an.According to the classification results,the clustering method with higher accuracy and better applicability is selected.In order to get the best number of clustering results,the four commonly used clustering effectiveness evaluation indexes were calculated and analyzed.Finally,according to the comparison of the methods,the clustering algorithm based on segmentation was used to divide Xi 'an area into two types of building climate zones.The sesult is more consistent with the actual climate characteristics.(3)The establishment of the comprehensive evaluation index system should first determine the principles of the system construction,which requires the indexes to obey the principles of scientific objectivity,system integrity,hierarchy and operability.The evaluation system takes the urban building climate as the goal,combines the regional indicators of urban building climate,establishes the judgment matrix,and determines the weight of each index by the analytic hierarchy process.(4)The fuzzy comprehensive evaluation method is used to make a quantitative analysis of the climate characteristics of each district in Xi 'an,calculate the comprehensive evaluation index of urban building climate,and compare it with the grade in the building climate zone of China.The maximum membership principle is used to judge whether the comprehensive evaluation results are effective or not.According to the probability distribution of the evaluation results,it is concluded that the probability of Xi 'an region being located in the fifth level is higher.Taking office buildings as an example,combined with TMY meteorological data,“Morphing” method was used to analyze the summer cooling load of different areas in Xi 'an.According to the energy consumption simulation,the cooling load in Xi 'an region increases first and then decreases from north to south.Therefore,in the energy-saving design of mid-latitude buildings in Xi 'an region,more consideration should be given to the cooling and heat protection functions of buildings to reduce the refrigeration energy consumption.South of Xi 'an should make full use of climate resources.In winter,we should pay attention to heat preservation and heat insulation,and focus on the heat preservation function of building furnace structure.In this paper,regional indicators were reasonably selected by statistical methods,and the accuracy of clustering algorithm was compared and analyzed.The urban climate classification was completed by taking 149 regional stations in Xi 'an as samples,which avoided the influence of subjective factors in the classification process and made the classification more reasonable and scientific.Analytic hierarchy process(AHP)and fuzzy comprehensive evaluation method are used to carry out quantitative analysis on the climate of different regions.Taking office buildings as an example,the cooling load in summer is compared and analyzed to further explore the energy saving potential and climate characteristics of Xi 'an,which lays a foundation for building energy saving design.