Role of Clothing Insulation for Thermal Comfort: A Numerical Study using Bio-Heat Transfer Model

Luitel, Kabita; Gurung, Dil Bahadur; Khanal, Harihar; Uprety, Kedar Nath

doi:10.3844/jmssp.2020.224.232

Cited by 3 publications

(1 citation statement)

References 9 publications

(25 reference statements)

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“…The heat retention of clothing is its ability to reduce the loss of heat emitted from the human body when the ambient temperature is lower than the human body temperature [7][8][9]. The thermal sensitivity refers to the sensation in the human body under the influence of heat flux when clothes made of textiles or other materials come in contact with the human skin [10][11][12][13]. This feature has recently become one of the major reasons that impact the sales of underwear, shirts, gloves and jackets.…”

Section: Introductionmentioning

confidence: 99%

Relationship between fiber diameter and performance of yak wool

Danzan

Dugerragchaa

Ukhnaa³

et al. 2021

Mong. J. Agric. Sci.

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This article demonstrates the thermal sensitivity and conductivity as well as the water permeability and absorptivity of Mongolian yak wool surfaces according to the Kawabata evaluation method. According to the results of the study, the mean value of thermal sensitivity (Qmax) of yak wool surface is 0.051 w/cm2 for down and 0.061 w/cm2 for coarse hair while the mean value of thermal conductivity is 2.08x10-4 (cal/cm ·0C) for down and 2.63x10-4(cal/cm · 0C) for coarse hair. This study, with its high level of confidence (p = 0.05), proves the difference between down and coarse hair. Additionally, the study shows a strong correlation between the thermal conductivity and the fiber diameter of Mongolian yak wool, resulting in a correlation level of r = -0.80 for down and r = 0.86 for coarse hair. When measuring the wettability of Mongolian yak wool, yak wool surface exhibited waterproof properties with a contact angle of 146.50 degrees for down hair and a contact angle of 147.10 degrees for coarse hair. The study also revealed a low correlation level of r = 0.39 for down and r = 0.40 for coarse hair when examining the relationship between the contact angle and the diameter of yak wool.

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Section: Introductionmentioning

confidence: 99%

Relationship between fiber diameter and performance of yak wool

Danzan

Dugerragchaa

Ukhnaa³

et al. 2021

Mong. J. Agric. Sci.

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The environment and ergonomics of clothing in the design of a human comfort system

Cherunova,

Kuleshova,

Tagiev

et al. 2024

E3S Web of Conf.

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During the time of stay in the city outside the closed premises during the periods of seasonal cooling, for a human thermal protection is provided by clothing. Clothing for protection from the cooling environment in the city is considered comfortable if its weight and dimensions do not limit a person in a given route and specificity of movement and does not draw attention to their own thermal sensations (i.e., the thermal balance of a person does not go out of the biophysical norm). Effective smart thermal protective clothing requires the inclusion in the thermoregulation system of consideration of individual human activity, which to some extent depends on the weight of the garment. Paper shows the proposed schematic diagram of the concept of operation of the functional system of smart thermal protective clothing. On the basis of the developed models and established functional relations for the proposed structure of smart thermal protective clothing, studies of its thermal effect depending on the properties of the clothing have been carried out. The developed functional models of connections of input and output parameters of biotechnical system “man-clothing-environment” allowed to reveal regularities of influence of clothing parameters and its weight on thermal comfort of a person in it.

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Bioheat Transfer Equation with Protective Layer

Luitel

Gurung

Khanal

et al. 2021

Mathematical Problems in Engineering

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The human thermal comfort is the state of mind, which is affected not only by the physical and body’s internal physiological phenomena but also by the clothing properties such as thermal resistance of clothing, clothing insulation, clothing area factor, air insulation, and relative humidity. In this work, we extend the one-dimensional Pennes’ bioheat transfer equation by adding the protective clothing layer. The transient temperature profile with the clothing layer at the different time steps has been carried out using a fully implicit Finite Difference (FD) Scheme with interface condition between body and clothes. Numerically computed results are bound to agree that the clothing insulation and air insulation provide better comfort and keep the body at the thermal equilibrium position. The graphical representation of the results also verifies the effectiveness and utility of the proposed model.

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Role of Clothing Insulation for Thermal Comfort: A Numerical Study using Bio-Heat Transfer Model

Cited by 3 publications

References 9 publications

Relationship between fiber diameter and performance of yak wool

Relationship between fiber diameter and performance of yak wool

The environment and ergonomics of clothing in the design of a human comfort system

Bioheat Transfer Equation with Protective Layer

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