Journal of the Society of Agricultural Structures, Japan
Online ISSN : 2186-0122
Print ISSN : 0388-8517
ISSN-L : 0388-8517
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Volume 22, Issue 3
Displaying 1-4 of 4 articles from this issue
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  • Simplified Determination Method for Thermal Properties of Moist Materials
    Kazunori IWABUCHI, Jun-ichi KAMIDE
    1992 Volume 22 Issue 3 Pages 145-149
    Published: March 31, 1992
    Released on J-STAGE: September 05, 2011
    DOIhttps://doi.org/10.11449/sasj1971.22.145
    JOURNAL FREE ACCESS
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    A method described in this paper is simplified in calculation for measuring thermal properties of moist materials. The proposed thermal probe method has merits of rapid determination of both the thermal conductivity and the diffusivity simultaneously with simple equipment.
    We measured thermal properties of agar (1%, w/v), which can be assumed to be equal to those of water, to check the accuracy. The results obtained showed the accuracy to be from -4 to +12% for the thermal conductivity and from -8 to +16% for the thermal diffusivity.
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  • Effect of Ventilation on Distribution of Carbon Dioxide Concentration in Windowless Swine Farrowing House
    Atsuo IKEGUCHI, Makoto NARA
    1992 Volume 22 Issue 3 Pages 151-159
    Published: March 31, 1992
    Released on J-STAGE: September 05, 2011
    DOIhttps://doi.org/10.11449/sasj1971.22.151
    JOURNAL FREE ACCESS
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    Model experiments were performed under summer ventilation in windowless swine farrowing house to prove the relationship between ventilation method: (1) incoming jet direction, (2) incoming jet velocity under the constant ventilation rate and distribution of contaminant (carbon dioxide) concentration. The object chosen for study was a house with continuous slot inlets and dampers above both side wall and with outlets at the center of the ceiling. It was found that the incoming jet direction significantly (5%) influenced the distribution of contaminant concentration. It likewise showed that contaminant can be eliminated only by incoming jet direction even if ventilation rate is not changed. It was concluded that contaminant in pens and inside building was better eliminated when the incoming jet direction was 45° downward and its velocity was 4.5m·s-1 than in other ventilation method. This is because dimensionless concentration was smallest inside pen and building in the direction in which air directly flowed into the pens where the contaminant generated. When incoming jet direction was 45° and 60° downward, carbon dioxide tended to accumulate towards the direction of the gable end wall. When it was 30° downward, however, the tendency was the reverse. A correlation between turbulent energy and dimensionless concentration (DC) was also shown. No existing correlation, however, was found between kinetic energy of mean flow and DC.
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  • Studies on Airborne Dust and Airborne Microbes in the Agricultural Structures (III)
    On the Environmental Characteristics of Windowless Broiler House
    Tomoyuki SENO
    1992 Volume 22 Issue 3 Pages 161-166
    Published: March 31, 1992
    Released on J-STAGE: September 05, 2011
    DOIhttps://doi.org/10.11449/sasj1971.22.161
    JOURNAL FREE ACCESS
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    The author has discussed on the concentration of airborne dust and airborne common (viable) microbes in the dairy barns, and in the rice drying and processing facilities at the previous papers. The present paper is concerned with the same purpose, but on the environmental characteristics of the windowless broiler house.
    The results obtained were summarized as follows.
    It was recognized that the concentration of airborne microbes and airborne dust had simillar distribution patterns. The number of the microbes which attached to respirable dust was estimated as 8.6×106CFP/mg. The relative ratio of the density of attached microbes was 10.9 for the windowless broiler house, while 1.0 for rice drying and processing facilities, 1.8 for dairy barns, and 2.0 for windowless fattening piggery. The quantity of the dust which accumulated in the broiler house was recognized to have large difference according to the age of broiler chicken, and was infered to relate to the behavior of the birds. The quantity of the accumulated dust was estimated to 1.22g/day/bird, and floating total dust in the air was estimated to 0.68g/day/bird, then total amount was 1.90g/day/bird. In this broiler house which accommodates 10, 000 birds in average, and during 64 days of breeding period, total dust generation was estimated as about 1.22ton, then 1/3 of total dust was accumulated in the house, and residuary 2/3 was exhausted to the outside of the house by ventilation.
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  • Development of Infra-red Remote Controller linked with Personal Computer
    Hiroyuki MUKAI, Sanki HASEGAWA
    1992 Volume 22 Issue 3 Pages 167-170
    Published: March 31, 1992
    Released on J-STAGE: September 05, 2011
    DOIhttps://doi.org/10.11449/sasj1971.22.167
    JOURNAL FREE ACCESS
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    [in Japanese]
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