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- 저자 : ( Fumina Tanaka ) (검색결과 2 건)
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Investigation Into the Design of the Dual Temperature Reefer Container using CFD
( Fumina Tanaka ),( Madoka Sekiya ),( Fumihiko Tanaka ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
In the transport of fruit and vegetables by ship, it is necessary to maintain freshness for a long period compared to air freight. Since the optimal storage temperature varies depending on the item, it is preferable to provide several temperature zones in one container. The objective of this study was to develop a dual temperature reefer container which temperature was set at 0°C and 10°C, and the optimum air conditioning design was investigated by using CFD (Computational Fluid Dynamics) to analyze thermal fluid. As a result, it was clarified that two rooms were adjusted to 0°C and 10°C in summer condition and winter condition. For opening direction of the return port, in consideration of the occurrence of condensation on the load, the upper opening was preferable. In addition, it was shown that it was necessary to improve such as extending the outlet of the duct to avoid a low temperature injury.
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Efficacy of 1-MCP on the Internal Structure of Japanese Persimmon
( Poly Karmoker ),( Wako Obatake ),( Fumina Tanaka ),( Fumihiko Tanaka ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
The efficacy of 1-MCP on the structural properties of Japanese persimmon was investigated at 0°C and 25°C for 8 and 4 weeks, respectively. X-ray computed tomography was employed to quantify the structural properties. The physicochemical properties such as moisture, apparent density, bio-yield stress, TSS and external color were measured destructively. 1-MCP satisfactorily delayed postharvest ripening in terms of bio-yield stress, L<sup>*</sup> and hue angle value at both temperatures. The average CT value, standard deviation, and high density part progressed over the storage period at both temperatures. The degree of increment of those properties of the 1-MCP treated fruit was much lower compared to other treated fruit. Peak height of the control and 1-MCP treated fruit was nearly constant, whereas it increased in the ethylene and 1-MCP+ethylene treated fruit. The histogram profile also shifted to a high-density region slightly in the 1-MCP treated fruit. Whereas the histogram profile of the ethylene treated fruit was shifted most toward the high-density region with an increment of peak height. The changes in porosity and thermal conductivity in the 1-MCP treated fruit were smaller than those in the control, ethylene and 1-MCP+ethylene treated fruit. The changes in porosity and thermal conductivity of the ethylene treated fruit were significantly higher than those of all treated fruit at the end of storage period. The physicochemical properties were strongly correlated with the average CT value and standard deviation at both temperatures. The L<sup>*</sup> value, hue angle, moisture content and bio-yield stress were negatively correlated with the average CT value and standard deviation, whereas the apparent density and TSS content were positively correlated. Thus X-ray CT images could be used to quantify the structural properties of persimmon fruit. The porosity and thermal conductivity distribution could be measured by using an X-ray CT device without destruction over the storage period. 1-MCP could suppress the changes in the internal structure of Japanese persimmon at 0°C and 25°C for 8 and 4 weeks, respectively.
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