The Relationship Between The Local And Overall Thermal Resistance And Moisture Resistance Of The Garment

With the continuous and rapid development of the social economy,people's life is increasingly diversified,multi-faceted and multi-level,and the people's yearning and pursuit of better life is stronger.Improving clothing comfort will improve people's quality of life.At present,studies on thermal and moisture comfort of clothing focus on the objective evaluation of thermal manikin and the subjective evaluation of human subject.The structure of thermal manikin is still being further studied.In view of the fact that "Walter" is not designed to sweat uniformly and cannot evaluate the local heat and moisture comfortability which results in a measurement error.The local heat flux density,nondominant sweating rate,skin temperature and humidity were measured in this paper.Local thermal insulation and vapour evaporative resistance were calculated and the relationship between the huaman and thermal manikin test results was established so that the thermal manikin could measure local heat and humidity for comfort evaluation.Under the condition of determining the experimental conditions,4 subjects and 4 sets of clothing suitable for experimental conditions(ambient temperature 13 ?/relative humidity 35%)were selected.The local heat flux,evaporative sweat rate as well as skin temperature and humidity of clothed human subject in three activities(sitting,standing and walking 2 km/h)were measured and the impact of activity status on the results was analyze.The results show that the activity has a significant effect on the heat flux density and evaporative sweat rate in individual parts of the human subject.And the activity has a significant effect on the total heat flux density,but there is no significant difference between the total evaporative sweat rate of different activity states.This results indicates that human subject thermal regulation mainly depends on dry heat in comfortable environment and the evaporative sweat rate of human subject is a relatively stable value in this station.When the dry heat regulation can not meet the conditions,human subject will produce liquid sweat for human thermal regulation.In addition,the clothing heat and sweat rate of 4 sets were tested using thermal manikin,and the ratio between the human subject results and thermal manikin testing results was calculated.The influence of the active state on the result of each part was analyzed.The result of the real test was obtained by weighting the local test result with the proportion of the area of the human subject.Studies show that the result of upper body in standing state is higher than sitting and walking state.The human subject and thermal manikin testing results in the same state show that the total thermal insulation of human subject testing is lower than the thermal manikin testing results,except for the thermal insulation of the set of clothing is largest.The dynamic human subject testing results were significantly higher than the thermal manikin.Clothing evaporative resistance in the standing state at the back,chest and upper arm is higher than the sitting state,an dthe other parts are lower than the sitting state.The dynamic insulation is lower than the resistance in standing state.The human subject testing clothing total evaporative resistance are higher than the thermal manikin testing results in standing and walking states.A linear fitting was performed between the local subject test results and the thermal manikin test results on the thermal insulation and evaporative resistance,as well as total results.The correlation coefficients except the individual parts were all fitted in the upper body with a slope of 0.75±0.20 and the lower body correlation coefficient was 0.50 ± 0.20.The arm part clothing evaporative resistance fits lower correlation.The correlation coefficients of the total thermal insulation were all fited with a slope of over 0.78,and the correclation coefficents of total evaporative resistance are over 0.90.The results show that there is a definite linear relationship between subject and thermal manikin testing results.This establishes a relationship between local and total thermal insulation,and provides the basis for designing of non-uniform sweating thermal manikin.