Regional differences in air velocity of microclimate inside clothing and bellows effect
(2017) 12th Joint International Conference CLOTECH' 2017 p.285-296- Abstract
- Despite of a crucial role of microclimate inside clothing in thermal comfort, air velocity inside clothing has been hardly reported, ever since Lewis et al (1969) demonstrated that air velocity of the still air layer on the naked human body was 0.25 m/s using colour schlieren cinephotography. This study was aimed to investigate the air velocity of microenvironment inside clothing and the bellows effects using an anemometer.
Four male subjects participated in this study (age 24±5 yrs; height 178±5 cm; weight 76±7 kg). Each trial began with a 10 min sitting on a chair and walking on a treadmill at 5.0 km/h with 3% slope for 30 min thereafter at 25oC and 40%RH. Experimental clothing consisted of semi-impermeable long-sleeved t-shirts... (More) - Despite of a crucial role of microclimate inside clothing in thermal comfort, air velocity inside clothing has been hardly reported, ever since Lewis et al (1969) demonstrated that air velocity of the still air layer on the naked human body was 0.25 m/s using colour schlieren cinephotography. This study was aimed to investigate the air velocity of microenvironment inside clothing and the bellows effects using an anemometer.
Four male subjects participated in this study (age 24±5 yrs; height 178±5 cm; weight 76±7 kg). Each trial began with a 10 min sitting on a chair and walking on a treadmill at 5.0 km/h with 3% slope for 30 min thereafter at 25oC and 40%RH. Experimental clothing consisted of semi-impermeable long-sleeved t-shirts (polyester with polyurethane/silver coating), sportswear pants (cotton 100%). Air velocity was measured on the chest, scapula, and side by an anemometer (6244 System, KANOMAX, Japan) with 0.01m/s of measuring resolution. One-way ANOVA and repeated measures ANOVA were tested to investigate the differences of state and region. Post-hoc test was conducted by LSD and the critical p-value was set at p < 0.1. All values were represented as mean±SD.
The results showed that the air velocity inside clothing was 0.09±0.04 m/s, 0.13±0.04 m/s, and 0.07±0.03 m/s on the chest, the scapula and the side, respectively in a sitting position. When subjects started to walk, it dramatically increased (p=0.025), and the greatest change caused by movement was presented in the side (0.51±0.32 m/s) followed by the chest (0.31±0.16 m/s) and the scapula (0.19±0.12 m/s). Air velocity in a static state and the change on the side were significantly greater than that on the scapula (p = 0.066, p = 0.054 respectively). (Less)
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https://lup.lub.lu.se/record/bce18f11-c911-4026-859c-557d097e1b9e
- author
- Kim, Siyeon LU ; Kim, Do-Hee ; Kuklane, Kalev LU and Lee, Joo-Young
- organization
- publishing date
- 2017-10-11
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- host publication
- Innovations in protective and e-textiles in balance with comfort and ecology
- editor
- Frydrych, Iwona ; Bartkowiak, Grazyna and Pawlova, Maria
- pages
- 12 pages
- publisher
- Lodz University of Technology
- conference name
- 12th Joint International Conference CLOTECH' 2017
- conference location
- Lodz, Poland
- conference dates
- 2017-10-11 - 2017-10-14
- ISBN
- 978-83-7283-855-1
- language
- English
- LU publication?
- yes
- id
- bce18f11-c911-4026-859c-557d097e1b9e
- date added to LUP
- 2017-10-30 23:04:49
- date last changed
- 2018-11-21 21:35:44
@inproceedings{bce18f11-c911-4026-859c-557d097e1b9e, abstract = {{Despite of a crucial role of microclimate inside clothing in thermal comfort, air velocity inside clothing has been hardly reported, ever since Lewis et al (1969) demonstrated that air velocity of the still air layer on the naked human body was 0.25 m/s using colour schlieren cinephotography. This study was aimed to investigate the air velocity of microenvironment inside clothing and the bellows effects using an anemometer.<br> Four male subjects participated in this study (age 24±5 yrs; height 178±5 cm; weight 76±7 kg). Each trial began with a 10 min sitting on a chair and walking on a treadmill at 5.0 km/h with 3% slope for 30 min thereafter at 25oC and 40%RH. Experimental clothing consisted of semi-impermeable long-sleeved t-shirts (polyester with polyurethane/silver coating), sportswear pants (cotton 100%). Air velocity was measured on the chest, scapula, and side by an anemometer (6244 System, KANOMAX, Japan) with 0.01m/s of measuring resolution. One-way ANOVA and repeated measures ANOVA were tested to investigate the differences of state and region. Post-hoc test was conducted by LSD and the critical p-value was set at p < 0.1. All values were represented as mean±SD. <br> The results showed that the air velocity inside clothing was 0.09±0.04 m/s, 0.13±0.04 m/s, and 0.07±0.03 m/s on the chest, the scapula and the side, respectively in a sitting position. When subjects started to walk, it dramatically increased (p=0.025), and the greatest change caused by movement was presented in the side (0.51±0.32 m/s) followed by the chest (0.31±0.16 m/s) and the scapula (0.19±0.12 m/s). Air velocity in a static state and the change on the side were significantly greater than that on the scapula (p = 0.066, p = 0.054 respectively).}}, author = {{Kim, Siyeon and Kim, Do-Hee and Kuklane, Kalev and Lee, Joo-Young}}, booktitle = {{Innovations in protective and e-textiles in balance with comfort and ecology}}, editor = {{Frydrych, Iwona and Bartkowiak, Grazyna and Pawlova, Maria}}, isbn = {{978-83-7283-855-1}}, language = {{eng}}, month = {{10}}, pages = {{285--296}}, publisher = {{Lodz University of Technology}}, title = {{Regional differences in air velocity of microclimate inside clothing and bellows effect}}, year = {{2017}}, }