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Volume 49 (2018)
- Issue 4 Pages 143-
- Issue 3 Pages 101-
- Issue 2 Pages 59-
- Issue 1 Pages 1-
Volume 49, Issue 3
Vol. 49, No. 3 (Ser. No. 158)
Displaying 1-5 of 5 articles from this issue
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-Livestock Building-Atsuo IKEGUCHI2018 Volume 49 Issue 3 Pages 101-105
Published: 2018
Released on J-STAGE: September 07, 2023
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-Livestock Building: Poultry housing-Atsuo IKEGUCHI2018 Volume 49 Issue 3 Pages 106-109
Published: 2018
Released on J-STAGE: September 07, 2023
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-Geothermal and Ground Source-Shintaroh OHASHI2018 Volume 49 Issue 3 Pages 110-116
Published: 2018
Released on J-STAGE: September 07, 2023
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Shuh MATSUDA, Hisashi YOSHIKOSHI, Hiroki KAWASHIMA, Ayaka CHIBA, Osam ...2018 Volume 49 Issue 3 Pages 117-126
Published: 2018
Released on J-STAGE: September 07, 2023
JOURNAL OPEN ACCESSGreenhouses with multi-layered thermal curtains have been widely disseminated. However, the optimization of the timing of opening/closing operation of such curtains deserves additional study. First, the heat dynamics in the greenhouse with multi-layered thermal curtains was modeled by combining steady and unsteady processes of heat transfer, and the model was verifi ed to have a reliable validity. Next, based on the model, the timing thresholds for the opening/closing operation were examined with reference to the room temperature, time of day, and amount of solar radiation. The relationships between the respective timing thresholds and the fuel consumption were investigated at a set room temperature of 12 °C. In the case of the curtain operation based on the room temperature threshold, fuel consumption was the lowest at the threshold of 13 °C (the standard control operation). In the case of the threshold of time of day, the minimum fuel consumption was calculated at the respective thresholds of 8:40 and 15:10 for opening and closing, and the fuel consumption was 46.1 L lower than that in the standard control operation. In the case of the threshold of amount of solar radiation, the minimum fuel consumption was calculated at the threshold of 180 W m-2, and the fuel consumption was 52.1 L lower than that in the standard control operation. Furthermore, it was found that the threshold for the opening operation is more important for energy saving than that for its counterpart closing operation. Resultantly, a method to optimize the thresholds for the opening/closing operation of the greenhouse curtain was proposed in consideration for the fuel consumption and the solar radiation.View full abstractDownload PDF (1718K) -
Fumihito MIYATAKE, Natsumi TOKIHISA, Takehito ONO2018 Volume 49 Issue 3 Pages 127-135
Published: 2018
Released on J-STAGE: September 07, 2023
JOURNAL OPEN ACCESSTo clarify the effects of recycled compost on composting reaction, quality of compost and facilities management in swine manure composting, temperature profi le, fertilizer components, microbial fl ora and management estimate was investigated with a real composting facility of swine manure. Compost material mixed with swine manure, sawdust and recycled compost at 1: 1: 1 (volume ratio) maintained a temperature of 55 °C or higher for 238 hours continuously, showing that it is possible to produce safe compost in which coliform bacteria were killed. In addition, this duration of high temperature promoted moisture evaporation, leading to high drying effi ciency. On the other hand, the compost temperature of material regulated the moisture content with only sawdust had only 36 hours for a duration of 55 °C or higher. Therefore, the number of coliform bacteria in the compost was detected at 3.2 × 105 cfu g-ds-1. For the fertilizer components, the concentration of phosphoric acid, potassium, zinc, copper and EC in the product compost increased by 1.4 to 2.4 times as the amount of recycled compost increased. According to management analysis, composting with material mixed at 1: 0.5: 2 had major economic effect. Meanwhile, it showed that composting of 1: 1: 1 leads to and labor saving of facility management.View full abstractDownload PDF (1033K)
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