Development And Performance Research Of Cylindrical Garment Microclimate Instrument

The clothing micro-climate apparatus is an important testing tool to measure the heat and humidity of clothing.Based on the principle of "Walter" thermal manikin,this paper designs a cylindrical microclimatometer for passive sweating.The instrument can not only test the thermal and humidity indexes of clothing,such as thermal resistance and vapor resistance by one-step method,but also study the influence of factors such as the change of wind speed and the change of air layer thickness under the clothing on the thermal and humidity indexes of clothing.It is more in line with the actual situation of human wearing.In this paper,a comparative experiment was carried out to determine the selection of stainless steel as the barrel material and the way to wear the semi-enclosed clothing.Then the thermal resistance value of the tested fabric was compared with that of the sweat planer through the distribution of the temperature and humidity field under the naked condition of the test instrument.The experimental results show that the temperature and humidity fields formed around the instrument are evenly distributed.There is a significant correlation between the measured thermal resistance value and the sweat level.All these prove that the test data of the self-made instrument is reliable.Then the experiment was carried out to test the heat and humidity indexes of eight different clothing fabrics,including cotton,polyester,mulberry silk and wool.The influence of fabric type,fabric thickness and fabric moisture permeability on the thermal humidity index of clothing was studied.The regression curves of fabric thickness,fabric moisture permeability and clothing heat and moisture resistance were established.Finally,the influence of external convective conditions and the thickness of the air layer under the garment on the thermal and humidity resistance of the pure cotton garment fabric is studied by adjusting the wind speed and the thickness of the air layer entrapped in clothing.The regression curves of wind speed and resistance to heat and humidity were established.The influence of the thickness of air layer under clothing on the thermal and humidity resistance of clothing is more complex,but the thermal and vapor resistance of clothing reach the maximum value under a certain thickness.This study provides data support for the selection of clothing fabrics and styles under the changing conditions of the external environment.