Study On Thermal Adaptation Characteristics And Thermal Comfort Temperature Parameters Of People Entering Tibe

In recent years,the number of people traveling for scientific expeditions and assisting Tibet in building Tibet has increased explosively,and foreigners have become an important part of Tibet’s urban population.The Qinghai-Tibet Plateau is cold and dry,low pressure and lack of oxygen,and there are obvious differences in the climate of the plain area,and the heat demand of the Tibet population for the built environment is different from that of the plateau population under the body adaptation mechanism,and it is difficult to directly continue the mainland standard,and its thermal comfort has special characteristics of plateau environmental adaptability.At present,the research on human thermal comfort under low pressure conditions has expanded people’s understanding of the influence of air pressure on human thermal comfort,and laid a foundation for the research on thermal comfort of people entering Tibet on the plateau.However,most of these studies focus on short-term exposure to low-pressure environments in climate chambers,which is difficult to reflect the longterm adaptation process of Tibet to the low-temperature and low-oxygen environment of the plateau.At the same time,the thermal experience of the population entering Tibet is affected by many factors such as altitude,climate,and time of entering Tibet,and the combination of various factors leads to the inconsistency of the thermal adaptation level and thermal comfort temperature parameters of the population entering Tibet.Therefore,in order to create a comfortable indoor thermal environment for Tibet,it is necessary to study the differences in heat adaptation levels and heat demand characteristics of Tibet.The following key results were obtained:1)On the basis of obtaining basic information and physiological parameters such as age,gender,hot oxygen experience,blood oxygen saturation,heart rate and other basic information and physiological parameters of the population entering Tibet in winter and summer,and comprehensively considering the hot oxygen experience and individual differences of the population entering Tibet,five indicators of altitude,climate of the source place,time of entry into Tibet,blood oxygen and heart rate were selected,and the mixed clustering method was used to divide the heat adaptation level of the population entering Tibet into three levels: stress compensation,adaptation compensation and basic adaptation.2)Analyze the evolution process of thermal adaptation of Tibetan population from three aspects: physiological,psychological and behavioral adaptation.After the Tibetan population moves to the plateau,the blood oxygen saturation can rise to more than 92%,and the heart rises first and drops below 80 bpm,and a series of compensatory reactions occur in the body.The average summer heat feeling vote is basically neutral.With the enhancement of the thermal adaptation level,the average thermal sensation vote in winter increased from-0.2 to 0.3,the thermal resistance of clothing in Tibetan areas in winter was concentrated in 0.9～1.4clo,and the thermal resistance of clothing in summer was concentrated in 0.6～0.9clo.3)Establish a fitting model of average thermal sensation and operating temperature of three levels of Tibet population,and obtain the thermoneutral temperature and acceptable temperature range of different levels of Tibet population.The winter thermal neutral temperatures of the population in the stage of stress compensation,adaptation compensation and basic adaptation were 19.7°C,19.3°C and19.1°C,and the 90% acceptable temperature ranges were 18.5～20.9°C,17.2～21.5°C and 16.9～21.3°C,respectively.Its summer thermal neutral temperatures are 23.0°C,22.3°C,22.1°C,and the 90% acceptable temperature ranges are 20.3～26.2°C,18.7～25.9°C,and 17.6～28.7°C,respectively.With the continuous evolution and enhancement of the level of adaptation to the plateau environment,the thermoneutral temperature of the human body gradually decreases,the thermal sensitivity gradually decreases,and the acceptable temperature range is wider.4)Guided by the fine design,the decision tree classification method was used to establish the prediction model of the refined thermal adaptation level of the winter and summer population entering Tibet according to the clustering results,and the accuracy of the model results after the test could reach 90%.The prediction software mainly includes three modules: user login module,data input module and result output module.Based on the needs of the group,the comfortable temperature parameters of different people experiencing heat and oxygen are given,and the research results can provide a reference for the design and evaluation of comfortable and livable building thermal environment in Tibetan areas.