Effect Of Wind Speed On Fabric Heat-moisture Transport Properties And Garment Heat-moisture Comfort

With the development of economy,people's demand for comfort of sportswear is getting higher and higher.Sportswear with good thermal and wet comfort can provide people with higher quality of life.When we exercise,there will be different degrees of ambient wind speed.And the wind speed is an important factor affecting the thermal-wet comfort of fabrics and clothing.This study will help to further reveal the influence of wind speed on heat-moisture transmission of fabrics,thermal and moisture comfort performance of clothing and the relationship between them.Firstly,the heat and moisture transfer properties of 10 common leisure sportswear fabrics under different wind speeds were tested.Test the moisture permeability and warmth retention of fabrics under different wind speeds,and then analyze the law that the moisture permeability and thermal insulation rate are affected by the wind speed.The experimental results show that:when the thermal work of the empty plate is not affected by wind speed,the thermal insulation rate gradually decreases with the increase of wind speed,and the rate of decrease with the increase of wind speed decreases continuously.(2)The moisture permeability increases with the increase of wind speed.And the rate of moisture permeability increasing with the increase of wind speed decreases.Secondly,the experiment of human clothing combines subjectivity and objectivity.The experiment was carried out in an artificial climate room with ambient temperature and humidity of 22? and 55%RH.The subjects were wearing different clothes and moving at indoor ambient wind speeds of less than 0.1 m/s,0.5 m/s and 1.0 m/s respectively.The physiological indexes of human body,microclimate and subjective heat and moisture sensation in the clothes during the movement were tested.The experimental results show that:(1)the average skin temperature decreases with the increase of wind speed.When the ambient wind speed is between 0 m/s and 1.0 m/s,the fluctuation range of the average skin temperature in each movement stage is between 0.5 0C?1.5?.(2)The microclimate temperature and humidity in the clothing decrease with the increase of wind speed.As the ambient wind speed increases by 0.5 m/s,the microclimate temperature inside the garment decreases by about 0.25??1.5?,and the microclimate humidity inside the garment decreases by about 2%?7%.(3)The increase of wind speed can obviously reduce the human body's thermal sensation and wet sensation during moderate intensity exercise,which is consistent with objective indexes.Finally,the consistency between the heat and moisture transfer performance of fabrics and thermal-wet comfort performance of clothing affected by wind speed is analyzed.Through linear fitting,the relationship between each index of clothing thermal-wet comfort and wind speed is obtained,and compared with the relationship between fabric heat transfer performance and wind speed.The analysis results show that:(1)the heat transfer performance of the fabric and the thermal comfort performance of the garment are consistent with the change trend of ambient wind speed,while the moisture permeability and sweat evaporation rate are consistent with the change trend of wind speed.(2)In the ambient wind speed range of 0m/s to 1.0 m/s,the degree to which the moisture permeability of the fabric is affected by the wind speed is consistent with the degree to which the microclimate humidity and sweat evaporation rate inside the garment are affected by the wind speed,and the degree to which the warmth retention rate of the fabric is affected by the wind speed is consistent with the degree to which the average skin temperature,the microclimate temperature inside the garment and the subjective thermal sensation are affected by the wind speed.