Research On Comprehensive Description Method And Application Of Outdoor Climate For Building

In the field of built environment,due to the complexity of outdoor climate change,existing studies usually decompose outdoor climate information into a series of parameters(temperature,humidity,etc.),and then explore the impact of these parameters on the built environment one by one to describe the comprehensive impact of outdoor climate.However,outdoor climate information is a whole.Excessive decomposition will inevitably make it difficult to reflect the overall climate information.At the same time,it also makes the building environment analysis methods more complicated and cumbersome.Although there are some comprehensive weather indexes in the field of meteorology that reflect the overall characteristics of outdoor climate information,it is difficult to directly use them in the analysis of the built environment due to their different application objects and purposes.How to comprehensively characterize outdoor climate information is still a bottleneck problem to be solved urgently.Therefore,this study attempts to deeply explore the comprehensive description method of outdoor climate for building and its effect on the built environment based on some emerging statistical analysis techniques in the field of meteorology.It focuses on exploring the fluctuation characteristics of outdoor climate,the reasonable selection of meteorological data processing timescales,the development mechanism of typical meteorological year(TMY),and the comprehensive description method of outdoor climate for building.The main results obtained are as follows:Firstly,this study provides an approach to extract the fluctuation characteristics of the outdoor meteorological parameters using the Ensemble Empirical Mode Decomposition method which is a non-stationary time series technique.The daily meteorological data from 1960 to 2019 used in this study is provided by the China Meteorological Data Center.From the perspective of outdoor climate fluctuations,this study obtained the fluctuation characteristics description method of outdoor climate.On this basis,this paper presents a unique timescale division method based on same climatic increment to make it applicable to the cyclic data.It better portrays the characteristics of non-uniform timescales of outdoor climate.Secondly,based on the fluctuation characteristics description method of outdoor climate,comprehensive description method of outdoor climate for building,including comprehensive description parameters of periodic fluctuation(CMIP)and stochastic fluctuation(CMIH),were established by considering the weighting factors of meteorological parameters acquired by the objective weighting factors determination method,namely the entropy weight method.The entropy weight method transforms the meteorological parameters with different units into the same dimension,and realizes the assignment of the weighting factors of the meteorological parameters that directly affect the building performance.The timescale division method and feature description method of comprehensive description method of outdoor climate for building are proposed.In order to explore the influence of the comprehensive description method of outdoor climate on the building thermal performance analysis result,a case study is carried out with the BETEST room of EnergyPlus software as the research object.The research results demonstrate that the dynamic orientation correction rate calculation method proposed by the comprehensive description method of outdoor climate for building is different from the existing methods,and it more reasonably reflects the thermal effects of seasonal changes and climate fluctuation characteristics on the building envelope of different orientations.Based on the timescale division results of the comprehensive description method of outdoor climate for building,the outdoor meteorological parameters involved in the building heat loss index can be valued on a smaller timescale,thereby reducing the average calculation error of the building heat loss index.Thirdly,an improved TMY database development method is proposed using the comprehensive description method of outdoor climate for building in this paper.It further improves the defects caused by the influence of abnormal values cannot eliminate,the weighting factors of meteorological parameters are determined empirically,and the original data timescale does not consider the impact of abrupt climate change.The effect of outdoor climate timescale division,fluctuation feature extraction and comprehensive description parameters on the effectiveness of the TMY database is in-depth discussed.The typical meteorological months(TMMs)of new TMY in sample cities is formed.The research results demonstrate that the improved typical meteorological year development method improves the correlation between the TMY database and the annual average value,compared with the existing methods.The solar radiation and mean wind speed have increased significantly.As a result,the revised outdoor design temperature for heating and ventilation in typical cities have been increased.Finally,Taking the case building as the research object,the thermal response characteristics of the building under the comprehensive influence of outdoor climate is discussed.To achieve this goal,based on three combined thermal indexes,namely total heat gain index,total heat loss coefficient,and total effective heat capacity,a simplified quasi-steady building thermal response prediction model in this study is established,which further considers the impact of building heat storage on the indoor thermal response characteristics.And the reliability of the prediction model is verified through experimental research.It reveals that the average prediction error of the simple quasi-steady building thermal response prediction model is ±1.5 ?.In order to explore the impact of the improved TMY on building energy consumption,the simple quasi-steady building thermal response prediction model proposed in this study is used for six typical cities in different climate zones.The difference between the improved TMY(EEMD method)and the existing TMY(Sandia,CTYW,CSWD,TPCY method)database in the calculation of building energy consumption is compared with the BETEST room of EnergyPlus software.It describes that the building energy consumption calculated with the improved TMY database is closer to the local long-term average energy consumption,and the relative average deviation is less than 6%.In summary,the comprehensive description method of outdoor climate for building proposed in this paper better portrays the comprehensive environmental characteristics of outdoor climate and improves the accuracy of building energy consumption calculation.This study provides a reference for further understanding of the comprehensive impact of the outdoor climate for building on the indoor environment.