Study On The Effects Of Thermal And Acoustic On Human Comfort

In recent years,with the improvement of living standard,people pay more and more attention to comfort.Many scholars have done a lot of researches on the single factor of thermal comfort and sound comfort,but in real life,people stay in the space of many factors.As a result,exploring the effects of composite factors on human comfort is significantly important.By using the method of subjective questionnaire survey and objective measurement,this paper explores the combined effects of thermal and sound factors on human comfort in environmental controlled cabin from the perspective of physiology,psychology and medicine.The questionnaire mainly involves in the thermal sensation,thermal comfort,acoustic sensation,acoustic comfort and total annoyance sensation,and the objective measurement mainly measures the skin temperature and heart rate of the human body.The main contents of this paper are as follows:(1)Explores the interaction effects of thermal system and acoustic system on different temperature levels and different sound levels.Experimental results show that the sound of the thermal sensation,thermal comfort are affected by the noise which will exacerbate thermal discomfort but reduce the cold discomfort,music can ease the thermal discomfort on high temperature level but increase the cold discomfort.Besides,temperature will stimulate the human auditory system to some extent,with the temperature rises,the acoustic sensation vote(ASV)and the acoustic comfort vote increase,that is,people will feel more and noisier and uncomfortable.(2)Explores the levels of temperature and the sound on total annoyance sensation.The experimental results show that the total annoyance sensation is positively correlated with the sound pressure level,and positively U-related with the temperature,that is,the greater the deviation from the neutral temperature,the higher the total annoyance vote.In addition,the level of total annoyance sensation is affected by the type of sound,the total annoyance sensation caused by noise is much greater than the music.(3)Focus on the changes of some physiological indexes such as body temperature and heart rate with the change of thermal environment and sound environment,and explores the mechanism of combined factors of sound and temperature on human comfort.(4)For the total annoyance sensation,establishes the equivalent relationship between the sound and temperature.(5)Defines the index of predicted percentage under the influence of combined factors of temperature and acoustic — PPD-TA.Besides,establishes the comfort zone and the acceptable zone under the combined factors.