The effect of air permeability and radiation property on free convective heat transfer of clothing system.

Satsumoto, Yayoi; Takeuchi, Masaaki; Ishikawa, Kinzô

doi:10.2115/fiber.47.6_263

Cited by 2 publications

(3 citation statements)

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“…Results suggest thermal resistance of the fabric and air space differs according to the characteristics of the air gap. For example, gaps may be irregularly shaped, of varying thickness and/or distributed in varying ways throughout the assembly (Wilson, et al, 1999a;Wilson, et al, 2000), orientated horizontally or vertically (Fowle, 1933;Hollands, et al, 1976;Spencer-Smith, 1977), and/or open or closed to the ambient environment (Satsumoto, et al, 1991). Wilson, et al, (1999a) suggested convection in very large air space, over a critical thickness of horizontal air space, may reduce thermal resistance ('dry') per unit thickness of the air space.…”

Section: Thickness Orientation and Height Of Air Layersmentioning

confidence: 99%

“…Altering the air permeability of inner fabric layers has been shown to affect the thermal resistance of fabrics wrapped around a cylindrical model exposed to wind (Fan, 1998;Fan and Keighley, 1989) (the magnitude of the effect was described as 'minimal'). Air permeability of fabrics and convection was also considered important in still air when vertical air spaces were Ͻ10 mm (Satsumoto, et al, 1991). Under these circumstances convection may occur in the air space because the heated air in the air space is of lower air pressure than that of the ambient environment.…”

Section: Variables Affecting Heat Loss During Air Movementmentioning

confidence: 99%

“…In wider spaces (i.e. 19 mm), permeability of the material to air was important only if the air space was closed (Satsumoto, et al, 1991), possibly due to reduced or negligible air flow through the wider air space than would occur if the bottom of the space was open.…”

Section: Variables Affecting Heat Loss During Air Movementmentioning

confidence: 99%

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Air and Air Spaces—the Invisible Addition to Thermal Resistance

Wilson

Laing

Carr

2002

JHES

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The aim of this review is to examine the contribution which air makes to the overall thermal resistance of garments (primarily) when in use. Issues related to i) air contained in fabrics, between fabric layers, between fabrics and the body, ii) garment design and the presence and effectiveness of closures and vents, and iii) the effects of wind and body movement are addressed. How these issues are affected by changes to body position, movement of air within the garment microclimate and exchange of the garment microclimate air with ambient air are also discussed. Indicators of a change in thermal resistance have generally been restricted to a change in microclimate air movement or to a change in energy required to maintain a thermal plate/manikin at a fixed temperature.

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Section: Thickness Orientation and Height Of Air Layersmentioning

confidence: 99%

Section: Variables Affecting Heat Loss During Air Movementmentioning

confidence: 99%

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Air and Air Spaces—the Invisible Addition to Thermal Resistance

Wilson

Laing

Carr

2002

JHES

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Evaluating Quasi-Clothing Heat Transfer: A Comparison of the Vertical Hot Plate and the Thermal Manikin

Satsumoto¹,

Ishikawa²,

Takeuchi

1997

Textile Research Journal

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In earlier work, we used a vertical hot plate as a simple model of the human body, and it was important to determine whether or not our experimental results from the hot plate could really be applied to the body. Recently, thermal manikins have emerged as substitutes for the body, and this work tests whether or not the vertical hot plate can still be used as the substitute. Experiments are done with the abdominal segment of the thermal manikin and the vertical hot plate to investigate the effect of clothing construction factors like the size of air spaces and opening designs, open or closed, on quasi-clothing heat transfer. Results from the two methods agree with each other only when the size of the air space is 20 mm, and it is difficult to reproduce a setup with a precisely sized air space for the thermal manikin. The manikin has more experimental errors than the vertical hot plate, as clarified by results of the vertical hot plate model and the theoretical analysis that follows. The heat transfer coefficient of the open garment case is larger than that for the closed garment case, with proximity to the opening. In addition, the difference in the heat transfer coefficient is largest when the size of the air space is 10 mm. We have verified that the results of the vertical hot plate are helpful in understanding the results of the thermal manikin. Moreover, if the investigation of the effect of certain physical factors on heat transfer of quasi-clothing is performed analytically, it is not absolutely necessary to use a human model of actual dimensions, like a thermal manikin.

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The effect of air permeability and radiation property on free convective heat transfer of clothing system.

Cited by 2 publications

References 0 publications

Air and Air Spaces—the Invisible Addition to Thermal Resistance

Air and Air Spaces—the Invisible Addition to Thermal Resistance

Evaluating Quasi-Clothing Heat Transfer: A Comparison of the Vertical Hot Plate and the Thermal Manikin

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