An improved experimental method for local clothing ventilation measurement

Abstract A clothing local ventilation measuring device based on the Lotens–Havenith steady state tracer gas method was developed and an improved experimental method for understanding local ventilation mechanisms was proposed. The local ventilation system can measure the arm, chest and back ventilation rates at the same time. Local ventilation mechanisms of an impermeable garment at two activities (static, walking) and two wind speeds (no wind, 1.2 m/s) were studied, with a focus on determining the pathways of ventilation through the different garment openings. The results showed that local ventilation rates of chest, back and arm varied considerably over locations and conditions. As expected, ventilation rates were highest for all locations at walking with wind conditions. Ventilation mechanism changed at different walking and wind conditions. The main air exchange pathway for all locations was through the garment bottom. Wind had a greater impact on clothing local ventilation than walking. Relevance to industry Clothing ventilation impacts worker's thermal comfort and safety directly both in the cold and heat. The new clothing local ventilation measuring device developed in this paper can measure both clothing local and whole ventilation. It can also help us to separate the different pathways for heat loss through clothing.

[1]  George Havenith,et al.  Regional microclimate humidity of clothing during light work as a result of the interaction between local sweat production and ventilation , 2006 .

[2]  Yejin Lee,et al.  3D quantification of microclimate volume in layered clothing for the prediction of clothing insulation. , 2007, Applied ergonomics.

[3]  Nunneley Sa,et al.  Heat stress in protective clothing. Interactions among physical and physiological factors. , 1989 .

[4]  George Havenith,et al.  Clothing ventilation, vapour resistance and permeability index: changes dus to posture, movement and wind , 1990 .

[5]  G. Havenith,et al.  Required clothing ventilation for different body regions in relation to local sweat rates , 2003 .

[6]  Byron W. Jones,et al.  Integrated human-clothing system model for estimating the effect of walking on clothing insulation , 2003 .

[7]  George Havenith,et al.  Body mapping of sweating patterns in male athletes in mild exercise-induced hyperthermia , 2010, European Journal of Applied Physiology.

[8]  Ping Zhang,et al.  Comparison of two tracer gas dilution methods for the determination of clothing ventilation and of vapour resistance , 2010, Ergonomics.

[9]  Jun Li,et al.  Mathematical simulation and experimental measurement of clothing surface temperature under different sized air gaps , 2010 .

[10]  S A Nunneley,et al.  Heat stress in protective clothing. Interactions among physical and physiological factors. , 1989, Scandinavian journal of work, environment & health.

[11]  G W Crockford,et al.  A trace gas technique for measuring clothing microclimate air exchange rates , 1972, British journal of industrial medicine.

[12]  George Havenith,et al.  Male and female upper body sweat distribution during running measured with technical absorbents , 2007, European Journal of Applied Physiology.

[13]  G Havenith,et al.  The effects of wind and human movement on the heat and vapour transfer properties of clothing. , 1999, The Annals of occupational hygiene.

[14]  George Havenith,et al.  Calculation of clothing insulation and vapour resistance , 1991 .

[15]  George Havenith,et al.  Ventilation of rain-wear determined by a trace gas method , 1988 .

[16]  Uwe Reischl,et al.  Assessment of Ventilation Characteristics of Standard and Prototype Firefighter Protective Clothing1 , 1980 .

[17]  George Havenith,et al.  Resultant clothing insulation: a function of body movement, posture, wind, clothing fit and ensemble thickness , 1990 .

[18]  G. Havenith,et al.  Correction of clothing insulation for movement and wind effects, a meta-analysis , 2004, European Journal of Applied Physiology.

[19]  Yayoi Satsumoto,et al.  Evaluation of Overall and Local Ventilation in Diapers , 2010 .

[20]  George Havenith,et al.  The effect of fabric air permeability on clothing ventilation , 2002 .