Study On Combined Interaction Rules Of Acoustic,Light And Thermal Environment On Human Comfort Based On Electroencephalogram

A suitable and comfortable indoor environment is conducive to ensure the health of occupants and improve working efficiency.The indoor environment consists of acoustic,light and thermal factors.However,studies on the interaction of acoustic,light,and thermal environments on total comfort in buildings are quite limited.Besides,most studies are based on subjective questionnaires and lack supports of physiological parameters.The compound effect of these factors on perception of comfort is not a simple overlap of the effect of each factor,and cannot be predicted based on the results of single factor.Therefore,it is necessary to deeply explore the interaction of acoustic,light,and thermal environment on total comfort.Based on this,this paper researches the interaction rules of different acoustic,light,and thermal environment on human comfort from the perspective of engineering,medical,physiology and psychology science.The main research works and conclusions are as the following:Firstly,this paper systematically studied the interaction of acoustic,light,and thermal environments on human comfort through subjective evaluation and physiological parameters.This study started from the combined environments of two factors(thermal-light environments,thermal-acoustic environments,acoustic-light environments)to the combined environments of three factors(acoustic-light-thermal environment).The results show that color temperature affects thermal sensation in the combined thermal-light environments,and light comfort is not affected by temperature in the near thermal comfort zone.In the combined thermal-acoustic environments,thermal comfort is affected by the acoustic environment and music can improve human comfort.In the combined acoustic-light environments,the acoustic environment can affect light comfort,and acoustic comfort is not affected by the light environment.Temperature,illuminance,color temperature,sound pressure level,and sound type have different effects on human comfort.The ranking of various factors affecting the total comfort is sound pressure level>temperature>sound type>illuminance>color temperature in this study.Secondly,based on the physiological response mechanisms of acoustic,light,and thermal environment,a method using electroencephalogram to study the rules of acoustic,light,and thermal compound environments on human comfort was proposed.Combining the relationship among electroencephalogram,human physiology and psychology,it is demonstrated that electroencephalogram has a certain physiological and psychological basis to represent the influencing mechanism of acoustic,light and thermal compound environments on human comfort.Thirdly,,we studied the effects of comfortable and uncomfortable environments on subjects’ electroencephalogram.The results show that indoor environment can significantly influence brain cortical activity.Compared with the uncomfortable environments,the total EEG energy of parietal lobe(P3,P4)is smaller,and the Theta frequency-band in the frontal pole(Fp1,Fp2)is significantly increased in the comfortable environments.It explains the influencing mechanism of different environment on the total comfort of the human from the perspective of energy consumption in comfortable environment,the brain is in a state of low energy consumption.EEG can be used as a biological marker to reflect total comfort in different environments.Finally,based on comfortable and uncomfortable environments,event related potential technology is used to study the psychological effects of different environments on human.The results show that indoor environments have psychological effects on human.The emotional arousal induced by emotional pictures is different in different environments.Uncomfortable environments are more likely to induce negative emotions,which further affects the subjective feelings of people.These findings are of great significance to improve the indoor environment,occupants’ satisfaction,and can be referred in the establishment of related comfort standards.