Overall and local intrinsic clothing insulation using thermal manikin: Impact of methods employed and postures: Fid-Bau Portal

Overall and local intrinsic clothing insulation using thermal manikin: Impact of methods employed and postures

Gao, Shan / Ooka, Ryozo / Oh, Wonseok

Abstract Development of multi-node thermoregulation models with local clothing insulation as an indispensable input parameter enables distinguishing the effects of spatial and temporal changes in the thermal environment around the human body. However, the current research on local clothing insulation lags compared with multi-node thermoregulation models, affecting model prediction accuracy. The effects of the determination methods and posture on the overall and local intrinsic clothing insulation remain unknown. Therefore, in this study, the overall and local intrinsic clothing insulation values for seven typical clothing ensembles in standing and sitting postures were determined using four different methods that included thermal manikin (TM) experiments and thermal comfort standards. The results showed that (1) the overall intrinsic clothing insulation I cl differed slightly across the methods, whereas the local clothing insulation I cl,i differed substantially across the methods; (2) the overall intrinsic clothing insulation I cl for the sitting posture was 15% lower than that of the standing posture, whereas the difference in the local intrinsic clothing insulation I cl,i for the standing and sitting postures was only statistically significant at the pelvis and thigh; and (3) the local intrinsic clothing insulation I cl,i differed significantly over different body segments, and the largest I cl,i was 2.7 and 3.2 times the smallest I cl,i for the standing and sitting postures, respectively. Therefore, methods employed along with the posture affected the results of both overall and local intrinsic clothing insulation. The findings are effective in modeling sensible heat loss through clothing and contribute to improving the prediction accuracy of multi-node thermoregulation models.

Highlights • Supplemented database on overall and local clothing insulation in various postures. • Methods compared to determine overall and local intrinsic clothing insulations. • Overall intrinsic clothing insulation is 15% smaller when sitting than standing. • Local clothing insulation (thigh and pelvis) is smaller when sitting than standing. • Largest local insulation: 2.7 (standing) and 3.2 (sitting) times the smallest value.