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Volume 14 (1983 - 198･･･
- Issue 3 Pages 2-
- Issue 2 Pages 6-
- Issue 1 Pages 4-
Volume 14, Issue 2
Displaying 1-4 of 4 articles from this issue
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Ritsuya YAMASHITA, Akio KIN1984 Volume 14 Issue 2 Pages 6-12
Published: May 25, 1984
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSWhen I visited Changchum on July and August in 1982, I investigated the equipments and the usage of the rice milling plant. Thogh the sizes of the equipments are similar to those in Japan, the operation and the performance are different. Technical check of some equipments was conducted in comparison to those of Japanese type, and the following results were obtained.
1) Because the received paddy contains many small stones and grains of different variety, the husking ratio is lowered; making use of many pre-cleaners necessary.
2) There are many cases in which the paddy storage bins are temporarily constructed. This system is considered inappropreate due to:
i) the occurance of much grain loss,
ii) much labor is necessary to construct and destroy the bins.
3) Due to the difference in the ratio of revolution difference and the method of separation of brown rice and paddy, the husking efficiency becomes about one half in comparison to Japanese ones,
4) The grinder type rice milling machines of which the grinder No. is # 24-30 are used in order to:
i) decrease the rice breakage,
ii) increase the milling ratio.View full abstractDownload PDF (7615K) -
A Heat BalanceEiji BEKKI, Yoshimi IWASAKI1984 Volume 14 Issue 2 Pages 13-21
Published: May 25, 1984
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe facility consisted of five greenhouses which together covered 4, 000m2 and an additional small room with a rice-hull burner and two heat exchangers for hot-air and hot-water. A performance test was run with maximum rate of burning while the outside air was -5°C with wind velocity of 5m/s. Snow covered the ground and the test was run from 9 to 11 p. m. on Feb. 25, 1981. The following results were obtained.
(1) Temperatures of the combusion gases in the burner, at tue entrance to the heat exchanger and at the exit of the heat exchanger were higher than estimated in the original design.
(2) Assuming a rice-hull heat value of 3, 200kcal/kg, 489, 600kcal/h were obtained at the maximum burning rate of 153kg/h. This gave a burning efficiency of 97.5%.
(3) The hot combustion gases caused an expansion of the connecting points between the entrance and the exhaust of the hot air heat exchanger. The expansion caused a leak through which some hot combustion gases escaped. The total heat input to the heat exchanger was estimated to be 487, 788kcal/h.
(4) The heat required to raise the temperature of the air and water was 47.5 and 27.8%, respectively, of the available heat. But the quantities of heat which were actually transferred were 40.2 and 22.2%. Therefore the efficiencies of heat transfer were 84.6 and 80.0%, respectively. The heat recovered by circulation of the hot-air and the hot-water was 33.7% and 94.2% of the heat supplied.
(5) The amount of heat actually transferred to the receiving side of two heat exchangers was 304, 443kcal/h corresponding to 62.4% of the total available heat. The other 19.8% of the available heat was waste-fully exhausted to the outdoors. If the wasted heat could be effectively used, the efficiency of heat transfer would improve to 82.2%.View full abstractDownload PDF (1136K) -
Evaluation of Environments by Operators and WorkersTomoyuki SENO1984 Volume 14 Issue 2 Pages 22-28
Published: May 25, 1984
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSTo clarify the influence of dust and noise problems at the inside of the rice drying and processing plants, investigations had been put for the workers and operators at the facilities. The results obtained were summarized as follows;
1) It had been evaluated as the most severe condition of working environment about “dusty” and “noisy”. And, some items including these environmental conditions had become serious problems.
2) It was recognized that the sections of work were related to the dusty environment in some degree, and not to noise environment.
3) The dust collection equipments were intimately concerned with the evaluation of the dust environment, and it showed that would be possible to evaluate the performance of the equipments.
4) From the self-conscious symptoms on the somata of workers and operators, some matters of symptoms were considered that caused by the influence of dust.
5) The present situation of environmental counterplans at the facilities were mentioned, and some problams concerned with these countermeasures were exhidited.View full abstractDownload PDF (882K) -
The Factorial Effects for the Long-wave Radiant Heat in Gable Roofed Open-type Livestock BarnsMasayoshi MINOWA, Tomoharu YAMAGUCHI, Yoshiyasu AIHARA1984 Volume 14 Issue 2 Pages 29-42
Published: May 25, 1984
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSAccording to the procedures in the second paper, the authors carried out an analysis of factorial effects on the long-wave radiant heat within gable roofed open-type barns under summer condition. The long-wave radiant heat that were subjected to the analysis were the diurnal average and the maximum, between 9:00 and 17:00, of downward long-wave radiant heat on an infinitesimal horizontal element located in the center of the barn one meter above the ground. The results were obtained as follows:
1) Factors that significantly affected the diurnal average and the diurnal maximum were revealed (Table 2 and 9).
2) Equations that are able to easily predict the diurnal average (Qlp, mn) and the diurnal maximum (Qlp, mx) were obtained (Eqs. (1) and (2)). The predicted values of different gable roofed open-type barns are calculated by the sums of the estimated values of the effects of several factors as indicated in Table 3 and 10.
3) Optimum levels of each factor that minimize the diurnal average and the diurnal maximum were presented (Table 8 and 11).View full abstractDownload PDF (1671K)
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