Assessment of airflow and microclimate for the running wear jacket with slits using CFD simulation

Lim, Jihye; Choi, Hyunyoung; Roh, Eui Kyung; Yoo, Hwa-Sook; Kim, Eunae

doi:10.1186/s40691-014-0025-2

Cited by 27 publications

(7 citation statements)

References 19 publications

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“…Previous studies on the microclimatic volume affecting the clothing insulations were mostly obtained with manikin stationary [9, 20,27,28,31]. However, since the ventilation when walking forces the insulation reduction ( [12,[32][33][34][35][36]), the multidisciplinary approach with moving thermal manikin was used.…”

Section: Materials and Test Methodsmentioning

confidence: 99%

The Study on Effects of Walking on the Thermal Properties of Clothing and Subjective Comfort

Špelić

Rogale

Bogdanić

2020

Autex Research Journal

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Former studies done by other authors investigated the first- and second-layered air gaps beneath the clothing garments. None of the previous studies reported multidisciplinary clothing design testing approach linking both the objective measuring methods and subjective responses, while testing the thermal properties linked to a microclimatic volume formed between the layers of garments forming the ensemble. Neither was determined the limiting value of the microclimatic volume for outerwear garments, after which the thermal insulation will start to decrease due to convection. By taking the advantage of the precise three-dimensional (3D) body scanning technology and reverse engineering 3D CAD tool, the volume of the microclimatic air layers formed under outerwear garments was determined to study the impact of the ensemble’s microclimatic volume on the overall insulation value, measured by means of the thermal manikin. The jacket with the smaller microclimatic volume provided 5.2–13.5% less insulation than wider jackets, while the ensembles with tighter jackets showed 0.74–1.9% less insulation in static and 0.9– 2.7% more insulation in dynamic conditions, thus proving that the limiting value of the microclimatic volume is greater than previously reported for three-layered ensembles. The effective thermal insulation value was reduced in average by 20.98–25.34% between standing and moving manikins. The thermal manikins are designed for steadystate measurements and do not work well under transient conditions, so three human subjects were employed as evaluators of the clothing thermal quality. In cooler climatic conditions, the measured physiological parameters and subjects’ grades pointed to discomfort while wearing ensembles with tighter jackets.

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Section: Materials and Test Methodsmentioning

confidence: 99%

The Study on Effects of Walking on the Thermal Properties of Clothing and Subjective Comfort

Špelić

Rogale

Bogdanić

2020

Autex Research Journal

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“…In fact, warming the innermost microclimate is more energy-saving compared to warming microclimate between the clothing layers by the heating device attached to the outerwear. Next-to-skin innermost microclimate has been noted as an important space for clothing comfort (Hong et al, 2019;Kumar et al, 2015;Lim et al, 2015;Peng et al, 2019), and it is a more effective place for heating than the outer layer where heat is directly lost to the cold environment due to the large temperature gradient between the warm outer surface and the cold environment. However, there is a lack of research on the smart base layer with a heating device in a multilayered wear condition, so far.…”

Section: Introductionmentioning

confidence: 99%

Tolerable range of abdomen and waist skin temperature for heating-capable smart garments

김

Hong

Lee

2021

IJCST

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Purpose This study aims to provide information on how to monitor the temperature setting of a heating device in order to implement a heating unit successfully in the smart clothing by observing voluntary heating behavior of wearers.Design/methodology/approach Subjects wearing base layers and additional clothing were asked to turn on and off the switch when wanted in the cold environmental chamber. Tolerable range of skin temperature (TST) depending on the location of body was obtained by observing the temperature at the time when the heating device was turned on and off during a rest–running–rest protocol.Findings The TST was 32.8–49.4 °C and decreased to 31.3–37.6 °C around abdomen and back waist, respectively. Changes in the wearers' voluntary control behavior were observed depending on the individual's level of cold-sensitivity and activity level of rest and running. TST was 35.8–49.4 °C (Rest 1: rest before exercise), 40.0–42.0 °C (Running) and 35.3–43.2 °C (Rest 2: rest after exercise) for cold-sensitive group, whereas it was 32.8–36.2 °C (Running) and 34.4–45.7 °C (Rest 2: rest after exercise) for cold-insensitive group.Originality/value In this study, results with detailed body locations and wearer's thermal sensitivity provide practical references for the implementation of a heating device to the comfortable multilayered smart clothing.

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“…Numerical simulation of realistic environments and the human body offers yet another opportunity for coupling a virtual human body built in the CFD environment with mathematical models of human thermoregulation, thermal sensation, and comfort (Cropper et al, 2010;Angelova et al, 2014;Lim et al, 2015;Voelker and Alsaad, 2018). In this way, the physiological and sensational human response to the designed environment can be simulated with high resolution and accuracy, given that the human response models are properly validated [12,13].…”

Section: Introductionmentioning

confidence: 99%

Influence of human body geometry, posture and the surrounding environment on body heat loss based on a validated numerical model

Psikuta

et al. 2019

Building and Environment

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For accurate prediction of human thermal comfort in indoor space, a fully validated human body-environment interface model is the key factor. In this study, a numerical model for heat transfer simulation between the human body and the environment was developed. Three parameters, including air speed, air temperature, and total heat transfer coefficient at the body surface, were validated against experiments including a manikin placed in a climatic chamber. Based on the verified model, a set of human body-environment parameters were investigated to quantify their relevance for thermal simulations. The parameters included three body geometries with different simplification levels, three body postures, and three kinds of environments differing in room configuration, size, and wall emissivity. The investigations revealed that body geometry simplification had only a moderate influence on overall heat transfer between the body and environment, while greatly influencing local heat transfer. Body posture showed a more prominent impact on heat transfer than the geometry, especially on the radiative heat transfer, due to the view factor change caused by local body orientation.The room configuration largely influenced the airflow pattern and, thus, convective heat transfer, while room size and wall emissivity only had an influence on radiative heat transfer. A similar environmental setup and body posture with the real situation would be suggested as the premise for the bodyenvironment modelling work. The validated numerical model, along with the set of body-environment parameters, can be used for a large range of investigations on human physiological response in varying thermal environments.

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Assessment of airflow and microclimate for the running wear jacket with slits using CFD simulation

Cited by 27 publications

References 19 publications

The Study on Effects of Walking on the Thermal Properties of Clothing and Subjective Comfort

The Study on Effects of Walking on the Thermal Properties of Clothing and Subjective Comfort

Tolerable range of abdomen and waist skin temperature for heating-capable smart garments

Influence of human body geometry, posture and the surrounding environment on body heat loss based on a validated numerical model

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