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 14, Issue 3
Displaying 1-4 of 4 articles from this issue
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  • Studies on the Thermal Radiation Environment within Livestock Barns (V)
    Evaluation of Thermal Radiant Environment Based on Respiration Rate of Fattening Pigs
    Masayoshi MINOWA, Tomoharu YAMAGUCHI, Yoshiyasu AIHARA
    1984 Volume 14 Issue 3 Pages 2-9
    Published: July 25, 1984
    Released on J-STAGE: September 05, 2011
    DOIhttps://doi.org/10.11449/sasj1971.14.3_2
    JOURNAL FREE ACCESS
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    In order to evaluate the thermal environment in open-type livestock barns by physiological responses of animals, the authors measured the response of respiration rate to thermal environment for two hogs (25-41kg.) (Table 1).
    The effect of mean radiant temperature on respiration rate was revealed to be almost the same as one of dry-bulb temperature by correlation and multiple regression analyses (Table 2-5).
    A single numerical index, “Environmental Evaluation-Temperature (EET)”, based on respiration rate was obtained (EET=(0.6-0.7) Td+(0.3-0.2) Tw+0.1Tmr, where Td, Tw and Tmr are dry-bulb, wet-bulb and mean radiant temperatures, respectively). This index was seemed to be useful for evaluating the effect of thermal radiant modifications in open-type barns.
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  • Heat Holding Characteristics of a Greenhouse with Three Movable Curtains and Well-water Spraying Device
    Yuhko OGURA
    1984 Volume 14 Issue 3 Pages 10-15
    Published: July 25, 1984
    Released on J-STAGE: September 05, 2011
    DOIhttps://doi.org/10.11449/sasj1971.14.3_10
    JOURNAL FREE ACCESS
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    In this report the auther investigated the heat holding characteristics of a greenhouse with three movable inner curtains and well-water spraying device.
    1) In maintaining room temperature of 13-15°C, an excellent overall heat transmission coefficient of 0.64kcal/m2hr°C was obtained.
    2) The well-water spraying system showed a high resistance to heat dissipation through curtains when the ambient air temperature was low. The ratio of room temperature decrease to ambient temperature decrease was as small as 0.22°C/°C.
    3) The heat transmission coefficient at each location of the greenhouse was obtained by means of a modified heat transfer model.
    4) The average error of 0.3-0.8°C was obtained when the night temperatures calculated by the following estimation formula were compared with the measured values.
    θin=0.13θsk+0.21θou+0.66θso+0.07Hw+0.18Hi
    This formula also gave the efficiency of 0.18°C/kcal m-2 hr-1 for hot air heating of this house.
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  • On the Performance of Low Cost Flat-Plate Solar Collecter
    Seiji YOSHIKAWA, Chiaki TADOKORO, Takaaki MAEKAWA, Makoto NARA, Shingo ...
    1984 Volume 14 Issue 3 Pages 16-20
    Published: July 25, 1984
    Released on J-STAGE: September 05, 2011
    DOIhttps://doi.org/10.11449/sasj1971.14.3_16
    JOURNAL FREE ACCESS
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  • The Performance of a Small-Scale Internal Combustion Engine Using Mixed Gas (CH4 60%+CO2 40%) as Fuel
    Yukio SAKAI, Kiyoshi HIROSAWA, Takaaki MAEKAWA, Shingo YAMAZAWA
    1984 Volume 14 Issue 3 Pages 21-26
    Published: July 25, 1984
    Released on J-STAGE: September 05, 2011
    DOIhttps://doi.org/10.11449/sasj1971.14.3_21
    JOURNAL FREE ACCESS
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