Wearable Sweat Rate Sensors for Human Thermal Comfort Monitoring

Abstract We propose watch-type sweat rate sensors capable of automatic natural ventilation by integrating miniaturized thermo-pneumatic actuators, and experimentally verify their performances and applicability. Previous sensors using natural ventilation require manual ventilation process or high-pow...

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Autores principales:	Jai Kyoung Sim, Sunghyun Yoon, Young-Ho Cho
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/808c6717b3a247fe97d7a59f606a5a4b
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spelling	oai:doaj.org-article:808c6717b3a247fe97d7a59f606a5a4b2021-12-02T15:09:11ZWearable Sweat Rate Sensors for Human Thermal Comfort Monitoring10.1038/s41598-018-19239-82045-2322https://doaj.org/article/808c6717b3a247fe97d7a59f606a5a4b2018-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-19239-8https://doaj.org/toc/2045-2322Abstract We propose watch-type sweat rate sensors capable of automatic natural ventilation by integrating miniaturized thermo-pneumatic actuators, and experimentally verify their performances and applicability. Previous sensors using natural ventilation require manual ventilation process or high-power bulky thermo-pneumatic actuators to lift sweat rate detection chambers above skin for continuous measurement. The proposed watch-type sweat rate sensors reduce operation power by minimizing expansion fluid volume to 0.4 ml through heat circuit modeling. The proposed sensors reduce operation power to 12.8% and weight to 47.6% compared to previous portable sensors, operating for 4 hours at 6 V batteries. Human experiment for thermal comfort monitoring is performed by using the proposed sensors having sensitivity of 0.039 (pF/s)/(g/m2h) and linearity of 97.9% in human sweat rate range. Average sweat rate difference for each thermal status measured in three subjects shows (32.06 ± 27.19) g/m2h in thermal statuses including ‘comfortable’, ‘slightly warm’, ‘warm’, and ‘hot’. The proposed sensors thereby can discriminate and compare four stages of thermal status. Sweat rate measurement error of the proposed sensors is less than 10% under air velocity of 1.5 m/s corresponding to human walking speed. The proposed sensors are applicable for wearable and portable use, having potentials for daily thermal comfort monitoring applications.Jai Kyoung SimSunghyun YoonYoung-Ho ChoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-11 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jai Kyoung Sim Sunghyun Yoon Young-Ho Cho Wearable Sweat Rate Sensors for Human Thermal Comfort Monitoring
description	Abstract We propose watch-type sweat rate sensors capable of automatic natural ventilation by integrating miniaturized thermo-pneumatic actuators, and experimentally verify their performances and applicability. Previous sensors using natural ventilation require manual ventilation process or high-power bulky thermo-pneumatic actuators to lift sweat rate detection chambers above skin for continuous measurement. The proposed watch-type sweat rate sensors reduce operation power by minimizing expansion fluid volume to 0.4 ml through heat circuit modeling. The proposed sensors reduce operation power to 12.8% and weight to 47.6% compared to previous portable sensors, operating for 4 hours at 6 V batteries. Human experiment for thermal comfort monitoring is performed by using the proposed sensors having sensitivity of 0.039 (pF/s)/(g/m2h) and linearity of 97.9% in human sweat rate range. Average sweat rate difference for each thermal status measured in three subjects shows (32.06 ± 27.19) g/m2h in thermal statuses including ‘comfortable’, ‘slightly warm’, ‘warm’, and ‘hot’. The proposed sensors thereby can discriminate and compare four stages of thermal status. Sweat rate measurement error of the proposed sensors is less than 10% under air velocity of 1.5 m/s corresponding to human walking speed. The proposed sensors are applicable for wearable and portable use, having potentials for daily thermal comfort monitoring applications.
format	article
author	Jai Kyoung Sim Sunghyun Yoon Young-Ho Cho
author_facet	Jai Kyoung Sim Sunghyun Yoon Young-Ho Cho
author_sort	Jai Kyoung Sim
title	Wearable Sweat Rate Sensors for Human Thermal Comfort Monitoring
title_short	Wearable Sweat Rate Sensors for Human Thermal Comfort Monitoring
title_full	Wearable Sweat Rate Sensors for Human Thermal Comfort Monitoring
title_fullStr	Wearable Sweat Rate Sensors for Human Thermal Comfort Monitoring
title_full_unstemmed	Wearable Sweat Rate Sensors for Human Thermal Comfort Monitoring
title_sort	wearable sweat rate sensors for human thermal comfort monitoring
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/808c6717b3a247fe97d7a59f606a5a4b
work_keys_str_mv	AT jaikyoungsim wearablesweatratesensorsforhumanthermalcomfortmonitoring AT sunghyunyoon wearablesweatratesensorsforhumanthermalcomfortmonitoring AT younghocho wearablesweatratesensorsforhumanthermalcomfortmonitoring
_version_	1718387884502810624

Wearable Sweat Rate Sensors for Human Thermal Comfort Monitoring

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