Comprehensive Performance Evaluation And Sensitivity Analysis Of Window Attachments In Office Buildings

In recent years,the extreme climate and the outbreak of COVID-19 have had a great impact on the world economy and energy,and building energy conservation is still the focus of social attention.The thermal conductivity of doors and Windows in building envelope is higher,and there is more heat loss caused by doors and windows,so it has great potential in building energy conservation.In addition,with the improvement of indoor people’s requirements for indoor light environment,the traditional doors and windows with fixed optical characteristics can not meet the dynamic needs of people.The use of window attachments can not only improve the heat transfer characteristics of windows,but also meet the needs of indoor people’s dynamic light environment,so it has been widely concerned by many scholars.In the performance research of existing window attachments,the lighting performance and energy performance are mainly evaluated separately.However,the performance of window attachments is affected by many factors,and the performance of window attachments is not the same under different conditions.In addition,the shading regulation behavior of personnel also has great influence on the performance of window attachments.Therefore,it is very important to evaluate and parameterize the comprehensive performance of window attachments considering the shading regulation behavior.Aiming at window attachments of office buildings in China,this paper obtains shade regulation rules and main factors influencing shade regulation distribution in different climate regions of China from questionnaire survey.On this basis,by means of simulation and experiment,the comprehensive performance evaluation system of office building sunshade products was established,and the comprehensive performance evaluation and parametric research of office building sunshade products were carried out.The specific work is as follows:Firstly,a questionnaire survey was conducted on the shade regulation behavior of personnel in office buildings in China.Through the statistical analysis of the annual adjustment state of shade in different areas,it is found that there is great uncertainty in the adjustment behavior of shade.Through the analysis of the driving factors of shade regulation behavior,it is found that glare,natural daylighting and air conditioning energy consumption are important factors affecting sunshade regulation behavior.It is further clarified that the three main aspects of shade product performance evaluation are glare,daylighting and air conditioning energy consumption.Secondly,the energy consumption simulation model and daylighting simulation model of sunshade products are established,the energy consumption simulation model is established in Energy Plus,and the daylighting simulation model is established by using"3 Phase Method"in RADIANCE.It lays a foundation for the comprehensive evaluation of window attachments.Then,the daylighting performance experiment and thermal performance experiment of different roller are carried out.The results show that there are differences in the glare and daylighting performance of the same roller.The transmittance and opening of the roller have a great impact on the daylighting performance of the roller.With the decrease of the transmittance and the increase of the pull-down distance of the roller,the stronger the ability of the roller to block the direct sunlight from entering the room,and the stronger the regulation of the indoor daylighting.At the same time,the experimental test verifies the accuracy of the energy consumption simulation model and daylighting simulation model of window attachments.After that,the anti-glare control strategy of shading products was developed,which fully considered the uncertainty of shading regulation behavior and determined the annual dynamic regulation schedule of shading products.Based on the simulation results of lighting and energy consumption of shading products,the glare evaluation index--anti-glare index（GP）,natural lighting evaluation index--daylight availability index（DA_S）and energy efficiency index（EP_S）of shading products were proposed.On this basis,the comprehensive performance index（ED）,which considered glare,natural lighting and air conditioning energy consumption,was proposed,and a complete comprehensive evaluation system for shading products was established.Finally,taking the roller as an example,7 key parameters affecting the performance of the window attachment are selected,and the comprehensive performance evaluation and sensitivity analysis of the roller are carried out in different climatic regions of China.The results show that the parameter that has the greatest influence on the comprehensive performance of the roller is T_sol.For severe cold areas,the sun shading roller shutter with T_sol as the median,emis2 as the high value and other parameters as the low value should be selected;For cold areas,the roller with T_{so l} as the median,R_sol and emis2 as the high value and other parameters as the low value should be selected.For hot summer and cold winter areas,the sun shading roller shutter with T_{so l} as the median,R_sol as the high value and other parameters as the low value should be selected;For hot summer and warm winter areas,the sun shading roller shutter with T_{so l} as the median value,R_sol,emis1 and emis2 as the high value,and other parameters as the median value should be selected.The comprehensive evaluation system of office building window attachments established in this paper fully considers the uncertainty of shade regulation behavior,and comprehensively evaluates office building sunshade products from three aspects of natural lighting,glare and air conditioning energy consumption.On this basis,the window attachments parametric research is carried out,and the suitable window attachments for office buildings in different areas are discussed,which provides a reference for the production and selection of high quality window attachments.