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Volume 42 (2011)
- Issue 4 Pages 155-
- Issue 3 Pages 83-
- Issue 2 Pages 51-
- Issue 1 Pages 1-
Volume 42, Issue 2
Vol. 42, No. 2 (Ser. No. 130)
Displaying 1-3 of 3 articles from this issue
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-Effect of Mixing Various Bulking Agents on Heat Recovery and Utilization-Yoichiro KOJIMA, Yoshiyuki ABE2011 Volume 42 Issue 2 Pages 51-58
Published: 2011
Released on J-STAGE: August 07, 2023
JOURNAL OPEN ACCESSIn this paper, we describe the use of various bulking agents for recovering heat from a vacuum-aeration composting system; in addition, we discuss the probability of utilization of the heat generated during composting processes. The materials were composted for 28 days using a 430 L reactor, and the heat recovered from vacuumed gases was calculated. Composting was carried out by employing four commonly used materials and two materials that are not commonly used, namely, rock wool waste generated from horticultural activities and spent mushroom waste. Heat energy of 229–601 MJm-3 was recovered from vacuum-aeration composting; 90 –162 MJm-3 of this recovered energy was obtained as utility energy. The heat recovered from vacuum-aeration composting was 13 % of the heat recovered in the case of combustion reaction.View full abstractDownload PDF (1182K) -
Shinsuke FURUNO, Sadanori SASE, Hironori SATO2011 Volume 42 Issue 2 Pages 59-64
Published: 2011
Released on J-STAGE: August 07, 2023
JOURNAL OPEN ACCESSIn a snowy and cold area of northern Japan, heat fl uxes on soil surface were investigated in several plastic greenhouses with different crop and cultivation conditions. The results can be summarized as follows: (1) The daily changes in heat fl ux on soil surface depended on the kind of growing crops under the similar conditions of solar radiation. In a plastic greenhouse which fl oor was always covered by the leaves and stems of hydroponically grown rose plants, upward heat fl ux on soil surface was less than 5 W m-2, and smaller than those for other crops. On the other hand, in the plastic greenhouse which cultivated cucumber or cherry plants, the solar radiation was accumulated into the soil, and the upward heat flux in the nighttime was about 20 W m-2 or less. (2) The changes in heat fl ux on soil surface during the investigation period depended on the plant growth stage, too. Although the solar radiation increased after March, the heat fl uxes on soil surface did not increase. The amount of solar radiation reaching onto soil surface was decreased by an increase in leaf area.View full abstractDownload PDF (1038K) -
-Examining the Route Length Using GIS-Genta KANAI, Kazuhiro TAKEKURA, Hitoshi KATO, Yuichi KOBAYASHI, Ken-ic ...2011 Volume 42 Issue 2 Pages 65-72
Published: 2011
Released on J-STAGE: August 07, 2023
JOURNAL OPEN ACCESSThe calculation Method I presented in Part 1 was based on the hypothesis that the transportation route length is equal to the straight-line distance from the fi eld to the facility, with its stock yard for straw. We examined Method I through comparison of results of Method I with results of GIS simulation, which can output the shortest route length (SRL) and the fastest route length (FRL). Results show that SRL is 120 % of the straight distance; FRL is 125–135 % of the straight distance. The value of the average straight distance (ASD) for transportation was found to be inadequate for the average length of the transportation route because the ASD was 85–115 % of SRL and 92–127 % of FRL for 50 kt of dry-straw collection. Other ASD values were 88–148 % of SRL and 94–163 % of FRL for 100 kt collection and 107–173 % of SRL and 118–188 % of FRL for the 200 kt collection. The amounts of fuel and trucks obtained using Method I were suffifi cient to support 91.7–106.5 % of 50 kt planned amount of straw collection when adopting the shortest routes based on the GIS program or 86.9–103.4 % when adopting the fastest routes based on the GIS program. Results show that ASD was shorter than SRL or FRL. The calculated results obtained using Method I tend to show smaller values for the necessary amounts of fuel and trucks.View full abstractDownload PDF (4851K)
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