Netsu Bussei
Online ISSN : 1881-414X
Print ISSN : 0913-946X
ISSN-L : 0913-946X
Volume 12 , Issue 3
Showing 1-3 articles out of 3 articles from the selected issue
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  • Junko Yoneda, Masako Niwa
    1998 Volume 12 Issue 3 Pages 108-113
    Published: July 31, 1998
    Released: August 31, 2009
    JOURNALS FREE ACCESS
    Architectural membrane structures are used to construct buildings such as sport domes, because membrane material(fabric coated with soft resin)is flexible, light weight, and offers moderate light transmittance. However, the thermal characteristics of membrane materials have not been investigated in detail. The thermal characteristics of membrane materials were evaluated using a Thermolabo ll developed by Kawabata and Niwa. Filed tests were made for mock-up structures made of various membrane materials. A numerical analysis predicted well the field test results and verified the usefulness of the thermal characteristics evaluated.
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  • Mitsue Ogawa, Tetsuya Baba, Kazuo Mukai, Makio Naito
    1998 Volume 12 Issue 3 Pages 114-119
    Published: July 31, 1998
    Released: August 31, 2009
    JOURNALS FREE ACCESS
    Polycrystalline alumina "REFERCERAM AL1" developed by the Japan Fine Ceramics Center has been studied as a candidate of thermal diffusivity reference materials. lt was experimentally confirmed that REFERCERAM AL1 is homogeneous and stable enough to be used as a reference material. Two specimens with different thickness (2mm and 3mm)were measured twice in the temperature range from R. T. to 1000K and the reference equation of thermal diffusivity was determined. Uncertainty of the reference equation was evaluated based on "Guide to the Expression of Uncertainty in Measurement(GUM)". The uncertainty of the equation consists of the relative uncertainty associated with material inhomogeneity of 1.61% and the relative uncertainty associated with the measurement of 2.29%. Then relative combined standard uncertainty is 2.80%(1σ)and the relative expanded uncertainty is derived as 5.60% with the coverage factor of "2"(2σ).
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  • Satoru Takada, Shuichi Hokoi, Tetsuya Umeno
    1998 Volume 12 Issue 3 Pages 120-125
    Published: July 31, 1998
    Released: August 31, 2009
    JOURNALS FREE ACCESS
    ln order to realize healthy and comfortable air conditioning suitable for human being without wasting energy, the transient thermal response of human body should be predicted precisely. Especially the evaporation of sweat has a significant influence on thermal response. Therefore, it is essential to understand the water behavior in clothes in detail. This paper deals with a model of liquid water movement in cloth. The water movement in the direction parallel to the plain of cloth is measured and is analyzed by a diffusion-type model. A liquid water diffusivity is determined, with a good agreement between the measured and calculated results. A two dimensional absorption process of water is also investigated.
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