Individual Difference In Thermal Comfort Of College Students In Jiao Zuo

Thermal comfort is usually affected by environmental conditions and human physiological conditions.Currently,most thermal comfort study the average characteristics of the group’s thermal adaptation subjects such as thermal sensation,thermal preference and comfort temperature.The analysis will mask the differences of the individual’s thermal adaptation to the indoor environment.In addition,whether a PMV model or a thermal adaptation model,the average thermal response of a group is the research object,and most of them do not consider the individual differences and the influence of physiological parameters on the model.To solve the above problems,the equal proportions of males and females and college students with different body shapes were choosed,using physiological experiment,physical testing and questionnaires survey methods in the natural ventilation environment in the summer natural ventilation environment of Jiaozuo University.The research tasks and findings are as follows:Firstly,human physiological parameters,clothing behavior,and psychological response is analyzed by genders.The results show that gender affects the physiological response to the thermal environment,which is reflected in differences in physiological indicators such as heart rate,blood pressure,and skin temperature.Gender differences have no significant effect on human clothing behaviors.Among them,gender differences have a significant effect on human psychological responses.Reflecteing in thermal sensation,there were no significant differences in thermal expectations,thermal comfort,and thermal acceptance.It is also proposed that the local thermal sensation and the overall thermal sensation can be described by weight coefficients.Among them,male and female upper body thermal sensation has the largest weighting coefficient on overall thermal sensation.Secondly,human physiological parameters,clothing behavior,and psychological response is analyzed by body shape differences.It is pointed out that different body types have significant effects on human physiological parameters,mainly reflecting that there is a statistically significant difference in high pressure between "slimming" and "fatging".The different body types have no effect on physiological parameters such as low pressure,heart rate,and skin temperature;the subjects with “lean” body shape have significantly higher thermal resistance than other body type subjects;but the psychological reactions(thermal sensation)of different body type subjects,Thermal expectations,thermal comfort,and thermal acceptability)were not significantly different.Then structural equations physiological,clothing behavior,and psychological response influence paths is established by using mathematical tools.The model is established by partial least squares due to the existence of multiple co-linear effects between parameters,which quantifies the multivariate linear relationship between thermal sensation and three thermal adaptation pathways of environmental parameters,physiological parameters,and clothing behavior.Finally,a combination of physiological,clothing behavior,and psychological responses was proposed.A new multivariate evaluation model is solved to design an intelligent control system applied to portable small fans for intelligent control.It is suggested that small fans in actual environments can stimulate the upper body of men and women to improve the overall environmental acceptability.