Research On Comprehensive Evaluation Of Indoor Environment Quality Of Library Based On Seasonal Characteristics

With the development of society,people are constantly pursuing a better life,and the quality of indoor environment has attracted more and more attention from all parties.University library is an important place for teachers and students to study and work.The quality of indoor environment directly affects the physical and mental health of teachers and students,Therefore,it is necessary to attach great importance to the indoor environmental quality of university library.This paper takes a university library in Guangzhou as the research object,this paper makes an objective measurement and subjective questionnaire survey on the indoor environmental quality of the library,Combined with seasonal characteristics,A comprehensive evaluation model of indoor environmental quality is obtained,which is suitable for the library.Four rounds of objective measurement of indoor environmental parameters were carried out,The survey covers summer,transition season and winter,The main measurement parameters are temperature(T),relative humidity(RH),formaldehyde(HCHO),inhalable particulate matter PM2 5,Carbon dioxide(CO2),illumination and noise level.The test results show that in addition to carbon dioxide(CO2)and formaldehyde(HCHO),Other environmental parameters are beyond the standard value.However,only by objective evaluation can not comprehensively and fairly reflect the indoor environmental quality.Therefore,we combine the objective measurement results with the subjective comfort evaluation results of the personnel on the environment obtained from the questionnaire survey,The objective parameters are logarithmicized by Weber-Fechner law,The evaluation sub index model pmvi suitable for library is established,the model builds a bridge between subjective and objective evaluation,it can reflect the subjective feelings of indoor personnel on the environment based on objective data.At the same time,the subjective questionnaire is used to investigate and analyze the environmental preference of indoor personnel.The results show that the preference of indoor personnel for the environment is not fixed,It will change with the season.In the evaluation of the indoor environment of the library,The light environment is the least important,Thermal environment is usually considered as the most important factor affecting indoor environment in summer,However,in the transitional season and winter,the acoustic environment is considered to be the most important factor.The corresponding weight factors of thermal environment,air quality,light environment and sound environment are(0.45,0.17,0.11,0.27),The transition season is(0.29,0.21,0.13,0.37),In winter,it is(0.16,0.28,0.16,0.4).Based on the analysis results of subjective and objective data,The obtained evaluation sub index model PMV_iis linearly synthesized with the subjective weight results of each season to obtain the final library indoor environmental quality evaluation and prediction model.Compare the evaluation results of the evaluation model with the multi season subjective evaluation results based on FCE-AHP,The feasibility of the model is verified.The model has the following characteristics:(1)The model is based on objective data,which not only reflects the advantages and disadvantages of the environment,but also reflects the comfort of indoor personnel;(2)The model can be used for indoor environmental quality evaluation in different seasons,In addition to evaluating and predicting indoor environmental quality,The model points out the direction for effectively improving indoor environmental quality.