Research On The Influence Of Air Humidity On Human Thermal Comfort

Air humidity occupies an important position in the main factors affecting human thermal comfort,and reasonable air humidity settings have an important impact on human thermal comfort.There are few studies on the influence of humidity on human thermal comfort at home and abroad,and most of them are qualitative analysis.Most of the research on humidity in the existing literature is carried out in a steady-state environment,with little consideration of human adaptability,and There are also few studies on the effects of sudden changes in relative humidity on human thermal comfort.Domestic and foreign standards are also unclear on the comfort range of relative humidity.Based on this,it is necessary to study the influence of air humidity on thermal comfort.This article mainly analyzes the relationship between relative humidity and human thermal sensation,humidity sensation,thermal comfort and skin temperature under different air temperature and humidity conditions,explores the human adaptive process to moisture,and establishes the relationship between thermal sensation and skin temperature,humidity sensation and thermal comfort at the same time.This article mainly adopted the research method that combines experimental testing and questionnaire survey analysis.The experimental tests were carried out in summer and winter respectively,and six different relative humidity environments of 30%,40%,50%,60%,70%,and 80% were set in the two seasons.In summer,the temperature of the artificial climate chamber was set to 22°C,26°C,and 30°C.in winter,the temperature of the artificial climate chamber was set to 12°C,15°C,and 18°C,respectively.The experiment set up two rooms,the preparation room and the artificial climate room.The subjects first rested in the preparation room for 30 minutes,and then entered the artificial climate room to fill in the questionnaire.The experimental test process of each working condition lasted for 1 hour.During the experiment,the temperature,humidity,air velocity and human skin temperature in the artificial climate chamber were measured.The subjects filled in the questionnaire three times in the artificial climate chamber,with an interval of 15 minutes each time.The results of the study showed that: In terms of skin temperature,in summer,the mean skin temperature increased with the increased in relative humidity,and the skin temperature increased by approximately 0.1°C to 0.2°C for every 10% increased in relative humidity.In winter,relative humidity has little effect on skin temperature.Under different air temperatures,local skin temperature,mean skin temperature and air temperature were positively correlated.In summer,the mean skin temperature increased by 0.3°C to 0.4°C for every 4°C increased in air temperature.In winter,the mean skin temperature increased by 0.2°C to 0.3°C for every3°C increased in air temperature.In terms of thermal sensation,relative humidity has an obvious influence on human thermal sensation when the temperature was high in summer.At low temperatures in winter,when the relative humidity was between 40% and 70%,the relative humidity has no effect on the human thermal sensation,when the relative humidity was outside the above range,it has little effect on the human thermal sensation.For the relationship between skin temperature and thermal sensation,in summer,human thermal sensation was positively correlated with skin temperature.In winter,human thermal sensation has a negative correlation with skin temperature,but there was no linear relationship.This study found that human thermal comfort was closely related to human thermal sensation,and there was a good linear relationship between mean thermal sensation and mean thermal comfort in summer and winter.In addition,this article compared the humidity sensation and thermal comfort of subjects of different genders,and it turned out that boys were more sensitive to humidity,while girls were more sensitive to temperature.