Study On Skin Temperature And Thermal Comfort Based On Human Experiment

Creating a safe,comfortable and healthy indoor thermal and humid environment is the premise of modern human to ensure efficient production and life.With the increase of building energy consumption,it will be the necessary premise of indoor thermal and humid environment design to meet the requirements of building energy saving while creating a comfortable environment for human body.Based on the heat exchange between human body and its surroundings,the skin temperature,heart rate,blood pressure and thermal sensation under different heat and humidity environment parameters were analyzed in detail.This study is divided into two parts.The first part measures and analyzes the human skin temperature,heart rate,blood pressure and thermal sensation under different experimental conditions,and explores the changes of human skin temperature,heart rate and blood pressure in different hot and humid environments.The second part analyzes the results of human thermal sensation voting under different hot and humid environments.The thermal comfort equation of PMV is simplified by theoretical analysis,and a simplified model for practical field application is proposed.The results of the simplified PMV calculation formula are compared with the actual thermal comfort voting results,and the accuracy of the thermal comfort index of PMV is evaluated.The experimental study was divided into three stages,25 experimental conditions,a total of 18 participants participated in the experiment,each experimental condition for 8 repeated experiments,each experiment 30 minutes,the subjects uniformly wear clothing thermal resistance of 0.33 clo.The first stage is to explore the changes of human physiological parameters under different environmental temperature and relative humidity.In sitting state,keep the air velocity < 0.05m/s,the relative humidity is controlled at 60,70,80% respectively,and the ambient temperature is changed to 24,26,28,30,32 degrees Celsius.The second stage is to explore the changes of human physiological parameters under different air velocities.In the sedentary state,the relative humidity was maintained at 70%,the air velocity was less than 0.05m/s,the ambient temperature was 28 and 30 degrees,and the air velocity was changed to 0.5,0.8 and 1.1m/s.The third stage is to explore the changes of human physiological parameters under different metabolic rates.Relative humidity was maintained at 70%,air velocity < 0.05m/s,ambient temperature was 28,30,and metabolic rate was 2.0 and 2.6met.The results show that the indoor thermal and humid environment parameters affect the human skin temperature,and the environmental temperature is positively correlated with the skin temperature,while the relative humidity has little effect on the skin temperature;when the relative humidity changes from 60% to 80%,the skin temperature changes within 0.3;when the environmental temperature is different,the skin temperature is affected by the relative humidity.The effect of relative humidity on skin temperature is different with the increase of ambient temperature;skin temperature and its decreasing range decrease with the increase of wind speed;skin temperature decreases with the increase of metabolic rate;and the greater the change of metabolic rate,the greater the effect on skin temperature.In the experiment,the metabolic rate was found to be an important factor affecting human heart rate and thermal sensation by measuring heart rate and blood pressure.Through experimental study and theoretical analysis,it is shown that skin temperature and thermal comfort are the important factors affecting human thermal comfort,and metabolic rate is an important factor affecting human thermal comfort.The relationship between average skin temperature and thermal sensation is obtained,which provides data basis and guidance for indoor thermal and humid environment parameter design.