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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 1
Vol. 49, No. 1 (Ser. No. 156)
Displaying 1-4 of 4 articles from this issue
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-A review on the Application of Solar Photovoltaics to Greenhouses-Akira YANO2018 Volume 49 Issue 1 Pages 1-7
Published: 2018
Released on J-STAGE: September 07, 2023
JOURNAL OPEN ACCESSDownload PDF (1216K) -
-Livestock Building: Livestock Facilities-Keiji TAKAHASHI2018 Volume 49 Issue 1 Pages 8-17
Published: 2018
Released on J-STAGE: September 07, 2023
JOURNAL OPEN ACCESSDownload PDF (1434K) -
Kazuhiro TAKEKURA, Kenichi YAKUSHIDO2018 Volume 49 Issue 1 Pages 18-23
Published: 2018
Released on J-STAGE: September 07, 2023
JOURNAL OPEN ACCESSStationary-type drying for cutting chip of Japanese cedar was developed and examined. The wood chip is expected as alternative fuel to heavy oil for boiler heating greenhouse. It is desirable to assume that the heat source for chip dryer is the exhausted heat of a biogas power plant. Therefore, we conducted a subscale and full-scale experiments of drying live-cut Japanese cedar wood chip through ventilation. For the subscale (0.1 m3 scale) experiment, the chip was dried for 210 min under the following conditions: an accumulated height of 30 cm; a ventilation flow of 14.2 L/s; and a ventilation temperature of 95 °C. At constant ventilation flow and temperature, it was shown that the drying time was proportional to the accumulated height. For the full-scale (1 m3 scale) experiment, the chip was dried for 580 min with a ventilation temperature of 100 °C. Over the course of these experiments, it became clear that the chip could be dried using the experimental dryer and a simple composting container. Therefore, we developed a new heatproof flexible container for ventilated drying. We estimate a drying time of 14.5 h with a ventilation temperature of 100 °C using the heatproof flexible container.View full abstractDownload PDF (1785K) -
Kazuhiro TAKEKURA, Yoshimichi YAMASHITA, Genta KANAI, Kenichi YAKUSHI ...2018 Volume 49 Issue 1 Pages 24-30
Published: 2018
Released on J-STAGE: September 07, 2023
JOURNAL OPEN ACCESSWe substituted fossil fuel with woody biomass during greenhouse heating for horticulture, which promoted the utilization of woody biomass as local resources. Field tests were performed by heating greenhouses with warm air converted from combustion heated hot water using a biomass boiler system with a rotary kiln-type burner as a main component. The air temperature of the rotary kiln-type burner was around 700 °C, and did not cause the common problem of fusion in the kiln. For 5 hours and 15 minutes, 65.6 kg of pellets was burned. The calories exchanged from combustion by a heat exchanger produced water of temperature about 80 °C in 5.5 hours from a 50 % rated fuel supply. The total calorie content was 935 MJ, and the heat efficiency was 84 %. The greenhouse was able to be heated from 17:30 to 09:30 the next morning. The temperature control accuracy in the greenhouse was ± 1 °C, and the total heat produced from calorie radiated heat was 840 MJ. This biomass boiler system has a heat storage tank, therefore even a small burner can heat the greenhouse. The unit cost of the system is around 70 thousand yen per kilowatt of burner capacity. Establishing more appropriate methods of burning and circulating hot water is necessary to improve the efficiency of calories produced from the burning of woody biomass.View full abstractDownload PDF (2419K)
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