Netsu Bussei
Online ISSN : 1881-414X
Print ISSN : 0913-946X
ISSN-L : 0913-946X
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Volume 29, Issue 3
Displaying 1-2 of 2 articles from this issue
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  • Study on Aging of Solar Reflectance of the High Reflectance Paint
    Hideki TAKEBAYASHI, Katsuo MIKI, Koji SAKAI, Yasutaka MURATA, Takafumi ...
    2015 Volume 29 Issue 3 Pages 122-128
    Published: 2015
    Released on J-STAGE: December 01, 2015
    DOIhttps://doi.org/10.2963/jjtp.29.122
    JOURNAL FREE ACCESS
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    Field measurement of solar reflectance was carried out on the building rooftop where high reflectance paint has been coated already. And solar reflectance of the white test plates was measured on the building rooftop of three universities. Then, several accelerated aging tests are reviewed based on the literatures, and an accelerated aging test is tried to apply for test plates coated with high reflectance paints. Reduction of solar reflectance is significant in about 2 or 3 months after coating and varies about 10 - 25 % in several years after coating. Solar reflectance of the white test plates set on the building rooftop of three universities fell around 5 to 10 % in about 50 days after coating. Most of the dirt components are carbon. Both reduction of dirt immediately after the painting and coating degradation by choking over a long period affect the temporal change of solar reflectance.
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  • Fundamental Properties of Potassium Acetate Aqueous Solutions
    Saburo Tanaka, Kiyoshi Ogawa, Naoe Sasaki
    2015 Volume 29 Issue 3 Pages 129-134
    Published: 2015
    Released on J-STAGE: December 01, 2015
    DOIhttps://doi.org/10.2963/jjtp.29.129
    JOURNAL FREE ACCESS
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    Various kinds of brine is used as a secondary refrigerant. Recently, some new brine is proposed, and the brine using potassium acetate aqueous solutions is paid to attention because the environmental load can be decreased. We investigated the fundamental properties of potassium acetate aqueous solutions, such as refractive index, density, specific heat and viscosity. The measurements of fundamental properties were performed in the temperature range varied from 5 to 50 °C for measurements of refractive index and specific heat, 0 to 70 °C for density and 0 to 50 °C for viscosity, while the concentration range varied from 0.0 to 50.0 wt% for measurements of refractive index, density and specific heat, 10.0 to 50.0 wt% for viscosity. In addition, the empirical equations of these properties are presented and are in good agreement with experimental results.
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