• 수산해양기술연구
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• 제35권1호
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• pp.60-64
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• 1999

The objective of this study was to manufacture the sea water cooling apparatus for fish hold storage to extend the freshness of fish. Using the sea water cooling apparatus manufactured, it makes observations on the physicochemical and sensual properties of mackerel such as ATP and its related compounds, K-value, VBN, TMA, TBA, salt-concentration and skin color through storage. The results of this investigation showed that the values of physicochemical properties such as ATP and its related compounds, K-value, VBN, TMA, TBA increased gradually during storage in sea water cooling apparatus manufactured and the changes of skin color was inhibited also. From these results, it could be suggested that developed sea water cooling apparatus is effective in shelf-life extension of fishes.

• Journal of Advanced Marine Engineering and Technology
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• 제25권6호
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• pp.1317-1323
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• 2001

The circumstance is giving the blow against fishermen with the incoming-decreasing and the difficulty of crew's supply & demand and management. In addition, the depression of the external situation like the departure of WTO system and the plan of EEZ proclaim is forcing fishery into improving their fishing condition. By this international and domestic circumstance, development of the sea water cooling apparatus for fish hold storage is demanded sincerely. First of all, we Investigated load characteristics which based on development of sea water cooling system and optimum fish hold storage. The experimental results is as follows. In creasing the speed of compressor and mass blew rate of refrigerant, the temperature of NaCl solution is low. And the load characteristics experiment on fish hold storage outlet is as fellows. As time goes by, increasing the mass flow rate of NaCl solution, temperature difference between inlet and outlet is small in a model of fish hold storage. These results provide many useful informations applicable to an actual design of sea water cooling system and optimum fish hold storage.

• 수산해양기술연구
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• 제37권1호
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• pp.52-56
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• 2001

별도의 엔진 구동형 소형 패키지 해수냉각시스템을 개발하기 위하여 압축기 회전수와 냉각수 유량 및 온도, 냉수 유량을 파라미터로 장치의 운전 특성을 파악한 결과 다음과 같은 결론을 얻었다. (1) 압축기 회전수와 증발기의 냉수 및 응축기의 냉각수 유량이 증가할수록 장치의 냉동능력은 증가하였으며, 압축기 회전수 및 냉각수 온도가 증가할수록 구동엔진의 연료소비량도 증가하였다. (2) 압축기 회전수와 냉각수 및 냉수의 유량이 증가할수록 냉각시스템의 성능계수는 증가하였으며, 냉각수 온도 및 압축기 회전수가 감소함에 따라서는 감소하였다. (3) 별도 엔진 구동용 소형 해수냉각장치 개발 및 운전조건 변화에 따른 시스템의 특성과 운전조건변화의 상관 관계를 파악할 수 있었으며, 시스템의 상용화 설계를 위한 기초자료를 얻을 수 있었다.

• Tribology and Lubricants
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• 제11권1호
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• pp.58-65
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• 1995

When marine lubricating oil began to be emulsified and oxidized through ingressive water that have leaked from cooling pump seal systems, cooler, purifier system and piping system, the cavitation erosion-corrosion in alloy metals of bearings remains to the various troublesome problem at effective engine performance. Therefore, applied the cathodic protection to the control test of cavitation erosion-corrosion, and appointed the marine system oil containing 3% sea water as test environments, with different conductibility. Also, used the piezoelectric vibrator with 20 KHz, 24 $\mu$m as the cavity generation apparatus, and examined the weight loss, potential value, current density etc. in specimens with those condition. According to this testing data, investigated influence of cathodic protection on the control characteristics of cavitation erosion-corrosion, and will serve those as an elementary design data of marine bearing.

• Journal of Advanced Marine Engineering and Technology
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• 제25권6호
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• pp.1324-1329
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• 2001

The depression of the external situation like the departure of WTO system and the plan of EEZ proclaim is forcing fishery into improving their fishing condition. By this international and domestic circumstance, development of the sea water cooling apparatus for fish hold storage is demanded sincerely. This study represents the thermal characteristics of the fish hold storage during transportation. The numerical analysis in this study is the finite volume method with the SIMPLE computational algorithm to study the seawater flow behavior in the fish hold storage. The computation were carried out with the variations of the circulating flow velocity and depth of fish hold storage. As the result of the three dimensional simulations, the mean temperature doesn't almost change by the circulating flow rate. find the mean temperature is suddenly changed by the ratio of depth of fish hold storage.