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

Xu, Jingxian; Psikuta, Agnes; Li, Jun; Annaheim, Simon; Rossi, René M.

doi:10.1016/j.buildenv.2019.106340

Cited by 26 publications

(6 citation statements)

References 26 publications

(30 reference statements)

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“…Some studies have focused on different experimental cabin environments, using different thermal stress evaluation indicators to describe the degree of human heat stress [18][19][20][21]. Fang et al [22] compared several commonly used outdoor thermal indices through experimental tests and surveys and concluded that there was a high correlation between predicted mean vote (PMV) and other indices, indicating that there was a significant difference between the original thermal stress and thermal comfort.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Thermal Comfort of COVID-19 Nucleic Acid Sampling Staff in Hot and Humid Environment: A Pilot Study of University Students

et al. 2021

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The current situation of Coronavirus Disease 2019 (COVID-19) prevention and control coupled with the need to work in high-temperature harsh environments makes it necessary to ensure the health and efficiency of medical staff. An experimental outdoor work tent was set up and university students were used to study the thermal comfort of personnel wearing protective clothing in hot and humid environments. The experiment was carried out simultaneously through subjective and objective field tests and physiological tests of personnel. The wet bulb globe temperature (WBGT) index was investigated to divide the outdoor thermal environment into four working conditions: 21–23 °C, 23–25 °C, 25–27 °C and 27–29 °C. Under the different thermal environment intensities, the variations of physiological parameters of test personnel were monitored. The results showed that when WBGT was increased to 27–29 °C, 100% of the participants expected the external temperature to become cooler and the humidity to decrease after one hour. When the temperature was close to 30 °C and the relative humidity was close to 60%, it was necessary to take cooling measures to reduce the thermal stress of the participants. Moreover, relationships between subjective feelings and physiological parameters of the nucleic acid sampling personnel were obtained. Results also found that the forehead, chest and back were the highest skin temperature parts, so it is most effective to give priority to improving the thermal comfort of these three locations. As an early attempt to conduct the real outdoor experimental study on the thermal comfort of COVID-19 nucleic acid sampling staff, this study provided a theoretical basis for follow-up research to develop cooling strategies for protective clothing in hot and humid outdoor environments.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Thermal Comfort of COVID-19 Nucleic Acid Sampling Staff in Hot and Humid Environment: A Pilot Study of University Students

et al. 2021

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“…Xu et al [34] analyzed the possible reasons for this variation, including differences in body geometry, body posture, and airflow patterns in the investigated room.…”

Section: Natural Convectionmentioning

confidence: 99%

Heat Transfer Mechanisms and Contributions of Wearable Thermoelectrics to Personal Thermal Management

Enescu

2024

Energies

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Thermoelectricity can assist in creating comfortable thermal environments through wearable solutions and local applications that keep the temperature comfortable around individuals. In the analysis of an indoor environment, thermal comfort depends on the global characteristics of the indoor volume and on the local thermal environment where the individuals develop their activity. This paper addresses the heat transfer mechanisms that refer to individuals, which operate in their working ambient when wearable thermoelectric solutions are used for enhancing heating or cooling within the local environment. After recalling the characteristics of the thermoelectric generators and illustrating the heat transfer mechanisms between the human body and the environment, the interactions between wearable thermoelectric generators and the human skin are discussed, considering the analytical representations of the thermal phenomena. The wearable solutions with thermoelectric generators for personal thermal management are then categorized by considering active and passive thermal management methods, natural and assisted heat exchange, autonomous and nonautonomous devices, and direct or indirect contact with the human body.

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“…The thermistor sensor with an accuracy of AE0.1 C (Betatherm/MTNW, Ireland) provided by the manikin system was placed 130 cm above the ground according to ISO 15831: 2004 and 10 cm in front of the manikin according to the research indicating that the thermal boundary layer of the thermal manikin is within 4 cm. 25,26 Table 3 summarizes the measured air temperature. It can be seen that the air temperature of the incubator was a little higher than the set value, especially for 0 C. Hence, the measured values were used for the following analysis.…”

Section: Experimental Conditions and Facilitiesmentioning

confidence: 99%

Effects of ambient temperature step changes on the heat storage and release in thermal protective clothing

Huang

Deng

2022

Textile Research Journal

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Ambient temperature steps between typical non-work and hot work environments will lead to clothing heat storage and release, which is crucial for human health and thermal comfort. In this study, the influence of five types of ambient temperature steps (from 0ºC/5ºC/10ºC/15ºC/20ºC to 40ºC to 0ºC/5ºC/10ºC/15ºC/20ºC) on the heat storage and release in clothing was investigated using a thermal manikin. A moving and temperature-controlled refrigerated incubator was constructed to realize the temperature step conditions. Results showed that ambient temperature step magnitude was positively related to heat storage and release. Some 80% of the amount of heat storage would be completed in around 10 min after the temperature steps. Increasing the inner clothing layer weight and specific heat capacity for local clothing at the chest, thigh and calf improved their heat storage against the large temperature step conditions. As for the abdomen, its heat storage was the largest. However, the clothing layer configuration impacted its heat release, so it was necessary to guide the heat transfer to the skin. The heat storage in the outer layer was increased by 2% to 39% due to adding the inner layer of the garment. The stored heat discharged completely until the temperature step magnitude exceeded 32.5°C. A multiple linear regression formula was proposed to obtain the clothing average heat storage by considering ambient temperature step magnitude and clothing insulation. The results of this study could contribute to the optimization of thermal protective clothing and improvement of the research on human thermal comfort.

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

Cited by 26 publications

References 26 publications

Experimental Investigation on Thermal Comfort of COVID-19 Nucleic Acid Sampling Staff in Hot and Humid Environment: A Pilot Study of University Students

Experimental Investigation on Thermal Comfort of COVID-19 Nucleic Acid Sampling Staff in Hot and Humid Environment: A Pilot Study of University Students

Heat Transfer Mechanisms and Contributions of Wearable Thermoelectrics to Personal Thermal Management

Effects of ambient temperature step changes on the heat storage and release in thermal protective clothing

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