Study On Dynamic Thermal Comfort Evaluation Of Swimming Pool Transition Zone

With the increasing demand for exercise and fitness,swimming,as one of the fitness programs,is favored by more and more people,and it has good preventive and rehabilitation effects on diseases.The thermal environment inside the natatorium building directly affects the health and comfort of swimmers and their exercise efficiency.At present,the research on the thermal comfort of natatorium focuses on the audience and the swimming pool area,and there are few studies on the thermal comfort of the transition zone.Due to the influence of skin moisture before and after swimming,the thermal comfort of swimmers in the transition zone is also quite different.Taking a standard swimming pool in Hohhot as an example,this paper tests the thermal environment parameters in the transition zone of swimming pool in different seasons by means of subjective questionnaire survey and field measurement,and studies the thermal environment distribution characteristics in the transition zone of swimming pool in different seasons by means of subjective heat and humidity feeling voting.The results show that the average indoor temperature and relative humidity in each transition zone meet the requirements of thermal comfort level II,but the air velocity in the transition zone of winter passage does not meet the requirements of thermal comfort level II.At the same time,the physiological parameters of swimmers in the transition area were tested continuously,and the relationship between the physiological reaction of swimmers and their thermal comfort was analyzed.It was found that the heart rate changed obviously when the thermal comfort of human body changed greatly,which showed that the average heart rate of swimmers when they felt uncomfortable was higher than that when they were comfortable.Secondly,the questionnaire survey results of people before and after swimming in the swimming pool are analyzed,and the dynamic changes of thermal sensation and thermal comfort of swimmers in each transition zone are obtained.On the basis of data statistics,calculation and analysis,the actual average thermal sensation MTS of people before and after swimming is fitted to the indoor operating temperature top,and a MTS fitting regression model is established.The thermal comfort characteristics of people before and after swimming are analyzed,and the thermal neutral temperature and acceptable temperature range of swimmers in each transition area are obtained through calculation.The results show that after swimming,people are affected by skin wetness,and the thermal comfort in the transition area of the channel is poor,and the change of air velocity has a significant impact on the thermal comfort of swimmers.The improvement of skin moisture after swimming obviously affects the adaptability of human body to temperature,and the thermal sensitivity of people after swimming is higher than that of people before swimming.The suggested indoor temperature range of the corridor transition zone is 29.7℃～30.8℃ in winter,25.2℃～27.2℃ in summer and 26.2℃～27.4℃ in transition season.Finally,based on the research on the thermal comfort evaluation index of the transition zone of the swimming pool,it is found that the RWI index is not suitable for the thermal comfort evaluation of the swimming pool by verifying the thermal sensation corresponding to the relative thermal index RWI value and the actual thermal sensation analysis.By adding the moisture degree of human skin and the difference of thermal and moisture parameters between the current area and the previous area,the influencing factors and significance of the thermal comfort of the swimming pool in different seasons are obtained by using SPSS for multiple regression analysis,and a dynamic thermal comfort model suitable for the swimming pool in this area is established.The research results provide some reference for the thermal comfort analysis of swimming pools in cold C areas.