Effect of direct neck cooling on psychological and physiological state in summer heat environment

To face the decrease of lifestyle comfort, the augmentation of hypothermia risks, and the deterioration of labor productivity resulting from energy consumption reduction policies, we have been proposing a wearable air-conditioning device worn like a scarf. This paper reports evaluation results of th...

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Autores principales:	Guillaume LOPEZ, Yasuhiro KAWAHARA, Yuta SUZUKI, Mikio TAKAHASHI, Hiroki TAKAHASHI, Masanori WADA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2016
Materias:	wearable peltier element personal cooling thermic sensation sweat sensation comfort heart rate variability Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/0b90db3675024f71ac304d6a9a25e008
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spelling	oai:doaj.org-article:0b90db3675024f71ac304d6a9a25e0082021-11-26T06:35:12ZEffect of direct neck cooling on psychological and physiological state in summer heat environment2187-974510.1299/mej.15-00537https://doaj.org/article/0b90db3675024f71ac304d6a9a25e0082016-02-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/3/1/3_15-00537/_pdf/-char/enhttps://doaj.org/toc/2187-9745To face the decrease of lifestyle comfort, the augmentation of hypothermia risks, and the deterioration of labor productivity resulting from energy consumption reduction policies, we have been proposing a wearable air-conditioning device worn like a scarf. This paper reports evaluation results of this wearable air-conditioning device’s effectiveness regarding comfort in hot summer office environment. We studied through trial subjects how neck cooling affects (1) subjective evaluation on comfort, thermic, and sweat sensations, and (2) human physiology when performing various deskwork tasks in summer heat environment. The environment of a typical Japanese office space in summer heat were reproduced using an environment control room. The environment control room’s temperature, humidity and wind velocity were set to re-create summer heat office environment (32°C, 60%, 0.15 m/s). 16 healthy subjects sat in the room in both normal condition and neck cooling condition. All subjects were dressed respecting the standard “cool-biz” dress code in Japan. (1) Comfort sensation, thermic sensation, and sweat sensation were evaluated by self-assessment. For all subjects, both discomfort sensation, heat sensation, and humidity sensation increased together with room temperature elevation, such we can understand that there is a clear correlation between environment temperature and comfort regarding temperature sensation. (2) Furthermore, we could quantitatively define the correlation between self-assessment, temperature variations, and physiological signals such as sweat amount and heart rate variability, by investigating the individual differences for comfort/discomfort in both normal and neck cooling conditions. Experimental results of this study show that using the wearable air-conditioning device in summer heat office, air-conditioner can be turned off or temperature set higher, without affecting comfort.Guillaume LOPEZYasuhiro KAWAHARAYuta SUZUKIMikio TAKAHASHIHiroki TAKAHASHIMasanori WADAThe Japan Society of Mechanical Engineersarticlewearablepeltier elementpersonal coolingthermic sensationsweat sensationcomfortheart rate variabilityMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 3, Iss 1, Pp 15-00537-15-00537 (2016)
institution	DOAJ
collection	DOAJ
language	EN
topic	wearable peltier element personal cooling thermic sensation sweat sensation comfort heart rate variability Mechanical engineering and machinery TJ1-1570
spellingShingle	wearable peltier element personal cooling thermic sensation sweat sensation comfort heart rate variability Mechanical engineering and machinery TJ1-1570 Guillaume LOPEZ Yasuhiro KAWAHARA Yuta SUZUKI Mikio TAKAHASHI Hiroki TAKAHASHI Masanori WADA Effect of direct neck cooling on psychological and physiological state in summer heat environment
description	To face the decrease of lifestyle comfort, the augmentation of hypothermia risks, and the deterioration of labor productivity resulting from energy consumption reduction policies, we have been proposing a wearable air-conditioning device worn like a scarf. This paper reports evaluation results of this wearable air-conditioning device’s effectiveness regarding comfort in hot summer office environment. We studied through trial subjects how neck cooling affects (1) subjective evaluation on comfort, thermic, and sweat sensations, and (2) human physiology when performing various deskwork tasks in summer heat environment. The environment of a typical Japanese office space in summer heat were reproduced using an environment control room. The environment control room’s temperature, humidity and wind velocity were set to re-create summer heat office environment (32°C, 60%, 0.15 m/s). 16 healthy subjects sat in the room in both normal condition and neck cooling condition. All subjects were dressed respecting the standard “cool-biz” dress code in Japan. (1) Comfort sensation, thermic sensation, and sweat sensation were evaluated by self-assessment. For all subjects, both discomfort sensation, heat sensation, and humidity sensation increased together with room temperature elevation, such we can understand that there is a clear correlation between environment temperature and comfort regarding temperature sensation. (2) Furthermore, we could quantitatively define the correlation between self-assessment, temperature variations, and physiological signals such as sweat amount and heart rate variability, by investigating the individual differences for comfort/discomfort in both normal and neck cooling conditions. Experimental results of this study show that using the wearable air-conditioning device in summer heat office, air-conditioner can be turned off or temperature set higher, without affecting comfort.
format	article
author	Guillaume LOPEZ Yasuhiro KAWAHARA Yuta SUZUKI Mikio TAKAHASHI Hiroki TAKAHASHI Masanori WADA
author_facet	Guillaume LOPEZ Yasuhiro KAWAHARA Yuta SUZUKI Mikio TAKAHASHI Hiroki TAKAHASHI Masanori WADA
author_sort	Guillaume LOPEZ
title	Effect of direct neck cooling on psychological and physiological state in summer heat environment
title_short	Effect of direct neck cooling on psychological and physiological state in summer heat environment
title_full	Effect of direct neck cooling on psychological and physiological state in summer heat environment
title_fullStr	Effect of direct neck cooling on psychological and physiological state in summer heat environment
title_full_unstemmed	Effect of direct neck cooling on psychological and physiological state in summer heat environment
title_sort	effect of direct neck cooling on psychological and physiological state in summer heat environment
publisher	The Japan Society of Mechanical Engineers
publishDate	2016
url	https://doaj.org/article/0b90db3675024f71ac304d6a9a25e008
work_keys_str_mv	AT guillaumelopez effectofdirectneckcoolingonpsychologicalandphysiologicalstateinsummerheatenvironment AT yasuhirokawahara effectofdirectneckcoolingonpsychologicalandphysiologicalstateinsummerheatenvironment AT yutasuzuki effectofdirectneckcoolingonpsychologicalandphysiologicalstateinsummerheatenvironment AT mikiotakahashi effectofdirectneckcoolingonpsychologicalandphysiologicalstateinsummerheatenvironment AT hirokitakahashi effectofdirectneckcoolingonpsychologicalandphysiologicalstateinsummerheatenvironment AT masanoriwada effectofdirectneckcoolingonpsychologicalandphysiologicalstateinsummerheatenvironment
_version_	1718409761045610496

Effect of direct neck cooling on psychological and physiological state in summer heat environment

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