• Journal of Advanced Marine Engineering and Technology
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• 제32권3호
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• pp.387-393
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• 2008

This paper has dealt with the probability of oyster shell desiccant cooling system driven by renewable energy of photo-volatic effect with fundamental experiment. The test materials for desiccant are activated charcoal, silica-gel, hi-dry, and oyster shell. The experiments were mainly performed with focusing on the observation of surface features, adsorption amounts of the adsorbent species, and the effect of temperature. Oyster shell has sufficient probability for using as desiccant in a air-conditioning system. Moreover, the heat releasing device would be attached in the system, the system based with oyster shell can be operated with high efficiency.

• Journal of Advanced Marine Engineering and Technology
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• 제31권8호
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• pp.899-903
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• 2007

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2011년도 전기공동학술대회 논문집
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• pp.266-266
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• 2011

• 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.

• 수산해양교육연구
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• 제16권2호
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• pp.210-217
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• 2004

Cooling technology has been a vital prerequisite for the rapid, if not explosive, growth of the electronic equipment industry. This has been especially true during the last 20 years with the advent of intergrated circuit chips and their applications in computers and related electronic products. The purpose of this study is to develop a telecommunication equipment cooling system using a thermoelectric module combined with cooling fan. Thermoelectric module is a device that can perform cooling only by input of electric power. In the present study, the cooling package using the thermoeletric module has been developed to improve the thermal performance. The cooling characteristics of the electronic chip was placed into the subrack and it can be rapidly assembled or disassembled in the equipment rack. As a preliminary experiment, the cooling performances between a conventional way using a cooling fin and a proposed method applying the thermoelectric module was comosed and analyzyed. The cooling performance at a simulated electronic component packaging a thermomodule operated well.

• Journal of Advanced Marine Engineering and Technology
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• 제39권4호
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• pp.468-472
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• 2015

최근 대두되는 선박배기가스 저감 등의 환경정책으로 인하여 에너지의 효율적 이용에 관심이 증가하고 있다. 본 논문에서는 함정의 에너지 효율 향상을 위하여 사용 부하에 따라 해수펌프를 제어하는 고효율 해수냉각시스템을 제안한다. 본 논문에서는 제안하는 시스템의 효과를 알아보기 위하여 추진 디젤기관의 냉각시스템을 모델링 하고 함정 운항특성을 고려한 시뮬레이션을 수행하였다. 시뮬레이션 결과 제안한 고효율 해수냉각시스템이 기존 해수냉각시스템에 비하여 약 53%의 에너지 절감효과가 있었다. 본 연구 결과는 향후 함정 추진 디젤기관의 해수냉각시스템의 성능 향상에 유용한 자료로 활용될 수 있다.

• 대한조선학회논문집
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• 제49권5호
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• pp.376-383
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• 2012

Owing to rapid development of power device and inverters, most of submarines adopt an eletric propulsion system. Although PMPM(Permanent Magnet Propulsion Motor) propulsion system has relatively higher power, energy conversion efficiency and smaller volume than engine propulsion system, it also produces large amount of heat due to current flowing inside motor coils and change of magnetic field induced by iron core. The produced heat in stator and inverter largely affects motor efficiency and bearing lubrication and causes thermal aging while the system is on operation. So, we analyze the existing cooling system and submarine ESS (Energy Saving System) cooling system whose power consumption is reduced. HILS(Hardware In the Loop System) technique is used for the modelling of the submarine cooling system. To confirm the ESS cooling system characteristic, HILS is simulated using LabVIEW with hardware. As a result, the ESS cooling system has the characteristic of better temperature stability and less power consumption than the existing one.

• Journal of Advanced Marine Engineering and Technology
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• 제34권8호
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• pp.1100-1106
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• 2010

LED는 온도가 일정이상 올라가면 효율이 떨어지고 수명이 짧아지는 단점이 있다. 본 연구는 이러한 LED의 효율적인 온도제어에 대한 것이다. LED의 방열을 위해 방열판과 팬을 사용하고 시스템의 온도제어는 원칩 마이크로프로세서와 PID제어를 통해 원하는 온도를 제어할 수 있음을 실험을 통해 확인한다. 궁극적으로 팬을 냉각장치로 사용하고 이를 잘 제어하면 LED 시스템 구동전력의 약 2%만을 사용하여 적절한 조도와 온도를 유지하는 성능을 얻을 수 있음을 제어실험을 통해 확인하였다.

• 해양환경안전학회지
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• 제11권2호
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• pp.109-115
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• 2005

하이드로사이클론은 다양한 산업 방면의 고$\cdot$액 분리를 위해 널리 사용되어왔다. 왜냐하면 하이드로사이클론의 적당한 응용으로 폭넓은 범위의 입자에 적용이 가능하기 때문이다. 불순물을 함유한 해수가 펌프나 열교환기로 흘러가면 그것은 해수 냉각시스템의 효율을 저하시키는 원인이 된다. 본 연구에서는 하이드로사이클론을 이용한 해수 냉각시스템에서 불순물을 분리하는 몇가지 방법을 제시했다. 설계의 영향을 미치는 인자로서 고체농도, 사이클론 입구압력, 하부배출구의 직경과 유량에 따른 하이드로사이클론의 분리효율에 대해 연구를 하였다. 이 연구의 결과는 다음과 같다. 1) 고형물질의 농도가 감소할수록 고$\cdot$액 분리의 효율이 증가하였다. 2) 사이클론 입구압력이 증가함에 따라 분리효율이 증가하였다. 결과적으로 이 연구에서는 하이드로사이클론을 기계류 냉각시스템의 전처리장치로 사용한다면 엔진시스템에서 예상치 못했던 사고를 방지할 수 있을 것이다.

• 수산해양교육연구
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• 제17권1호
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• pp.18-25
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• 2005

We have researched 10,811 schools to evaluate the characteristics of school buildings and the conditions of heating and cooling systems at the elementary, middle and high school levels. Air conditioning systems in school buildings are related to school scale, and 35% of the researched schools have less than 10 air conditioned classrooms among all of the schools in Korea. The LOADSYS is used to grasp the characteristics of school buildings heating and cooling load. From the results of this work, the heating load differs by nearly 24% between Seoul and Busan, but other than that there are not so many serious regional differences. Almost 85.4% of the classrooms are equipped with heating facilities and 6.9% of them are equipped with heating and cooling facilities. As a result, it is necessary to make improvements in 31.8% of the classrooms using only heaters and 14.6% of the classrooms not equipped with HVAC. The survey shows that there is a wide gap in the heating equipment status of the classrooms according to the region and school district.