• Transactions of the Korean Society of Mechanical Engineers B
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• v.34 no.6
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• pp.607-613
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• 2010

A seawater distiller, in which the waste heat from a portable electric generator was used, with a multiple-effect diffusion still was designed. The waste gas from small generators commonly used in islands has not yet been used because it has less thermal energy; however, this waste gas can be used as a heat source for small-capacity distillers and as an additional heat source for solar stills. The proposed distiller comprises a series of closely spaced parallel partitions that are placed in contact with saline-soaked wicks. In the distiller, evaporation and condensation processes are repeated to recycle the thermal energy for increasing the distillate productivity. Experimental results show that the proposed distiller with only one-effect still can produce at least 6.7 kg/day of distilled water; the proposed distiller with a ten-effect still is expected to produce 43 kg/day of distilled water. This amount of distillate is approximately four times the maximum daily productivity of the solar stills, as determined in outdoor experiments.

• Transactions of the KSME C: Technology and Education
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• v.1 no.1
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• pp.59-68
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• 2013

In the present study, sea water reverse osmosis desalination system was composed with an ultra-filtration membrane as a pre-treatment. Sea water was induced into the pre-treatment composed with an auto-screen filter and an ultra-filtration membrane. It was proved that the permeate of the pre-treatment was adequate for reverse osmosis desalination system by measuring the $SDI_{15}$ and the turbidity. Feed salinities was changed by mixing the brine and the permeate. Inlet salinities effected the performances of sea water reverse osmosis desalination system in a large amount such as the salt rejection, the recovery ratio, the pressure, the product salinity. Energy consumptions per the ton of the product were almost linearly increased with the inlet salinities.

• Journal of the Korean Solar Energy Society
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• v.31 no.3
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• pp.23-28
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• 2011

In this study, the ejector design was modeled using Fluent 6.3 of FVM(Finite Volume Method) CFD(Computational Fluid Dynamics) techniques to resolve the flow dynamics in the ejector. A vacuum system with the ejector has been widely used because of its simple construction and easy maintenance. Ejector is the main part of the desalination system, of which designs determine the efficiency of system. The effects of the ejector was investigated geometry and the operating conditions in the hydraulic characteristics. The ejector consists mainly of a nozzle, suction chamber, mixing tube (throat), diffuser and draft tube. Liquid is supplied to the ejector nozzle, the fast liquid jet produced by the nozzle entrains and the non condensable gas was sucked into the mixing tube. The multiphase CFD modeling was carried out to determine the hydrodynamic characteristics of seawater-air ejector. Condition of the simulation was varied in entrance mass flow rate (1kg/s, 1.5kg/s, 2kg/s, 2.5kg/s, 3kg/s), and position of driving nozzle was located from the central axis of the suction at -10mm, 0mm, 10mm, 20mm, 30mm.. Asaresult, suction flow velocity has the highest value in central axis of the suction.

• Transactions of the KSME C: Technology and Education
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• v.2 no.1
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• pp.47-55
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• 2014

A new concept of an Eco-friendly desalination method is introduced in this study. The main idea of the desalination method of seawater is the condensation of the vaporized seawater by solar heat energy on the surface of seashore. The wind turbine blade plays a role of heat exchanger condensing the vaporized water in the air. In this analytical study, the availability of the proposed desalination system was studied. First, an analytical condensation theory of the vaporized water in air was arranged and the parametric study was conducted to estimate the amount of freshwater produced from the system with the change of the temperature difference between the humid air and turbine blade, and the relative humidity in air, and wind speed. From the analytical calculation, 2,927(ton/year) of freshwater was produced at the vertical-type wind turbine (Diameter=4m, Height=3m) as the relative humidity is 100%, the temperature difference between the impeller blade and the humid air is $40^{\circ}C$ and the wind speed is 10m/s.

• Journal of Aquaculture
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• v.20 no.2
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• pp.121-126
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• 2007

Comparison of fish number on routine oxygen consumption (OC) of black porgy (Acanthopagrus schlegeli) reared in seawater (SW) versus freshwater (FW) was performed in closed water-recirculating system containing respiratory chamber. Fish acclimated in separate indoor tanks with SW or FW were sampled as two groups (one or three of fish used, $mean\;{\pm}\;S.D.=36.4{\pm}9.8$). OC of fish reared in both SW and FW showed clear temporal rhythms, with higher values in the daytime and lower values at night, in accordance with light (09:00-21:00 h) and dark (21:00-09:00 h) phases of the diel cycle (12L:12D). The OC of the fish increased linearly with the water temperature. The OCs of black porgy reared in SW and FW at 15, 20, $25^{\circ}C$ were 140.0, 174.8, 282.3 mg $O^2{\cdot}kg^{-1}{\cdot}h^{-1}$ and 177.5, 307.8, 413.1 mg $O^2{\cdot}kg^{-1}{\cdot}h^{-1}$ for the one of fish used, and 200.5, 274.7, 339.1 mg $O^2{\cdot}kg^{-1}{\cdot}h^{-1}$ and 118.2, 188.2, 252.8 mg $O^2{\cdot}kg^{-1}{\cdot}h^{-1}$ for three of fish used, respectively. Black porgy reared in SW had higher ventilation rates than those in FW. These results indicate that black porgy reared in FW had higher OC than those in SW at the one of fish used, but the fish reared in SW had higher OC than those in FW at the three of fish used.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.37 no.1
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• pp.81-86
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• 2013

Exhaust gas from a small portable electric generator is simply exhausted to the surroundings because the capacity and quality of the waste heat of this gas is generally not sufficient to recover and utilize. We have proposed a seawater distiller utilizing the thermal energy of waste gas from an electric generator. The distiller recovers heat from the waste gas by means of a heat pipe and uses it effectively through a multiple-effect diffusion-type structure. We constructed an experimental apparatus with a vertical single-effect still having a 4-stroke 50 cc generator engine and found that the experimental results for distillate productivity show good agreement with the theoretical predictions. The results show that the distiller can recover 52 W of waste heat from the gas at $171^{\circ}C$, and ~85% of the recovered heat can be utilized for distillation to produce 70 g/h of fresh water. This is equivalent to a productivity of 500 g/h in the case of a 10-effect still. Therefore, the proposed distiller should be useful in remote areas where electricity and water grids are inadequate.

• 기계와재료
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• v.24 no.1
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• pp.48-62
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• 2012

플랜트 기자재 산업은 전력 석유 가스 담수 등 제품 생산 설비 및 공장 건설에 소요되는 기자재류 제조업을 일컫는다. 국내 플랜트 산업은 세계 7위 수준인 반면, 외화가득률은 30% 이하에 머물러 있다. 국산 조달률이 가장 저조한 기자재는 기계 기자재류이며, 특히 펌프, 압축기 등과 같은 회전장치류 대부분이 수입에 의존하고 있다. 따라서 국내 플랜트 기자재 산업의 장기적 기술경쟁력 확보를 위해서는 국산화율은 저조하지만 고부가가치 품목인 펌프, 압축기에 대한 기술개발, 외국기업과 기술제휴 및 M&A 등을 통해 기술력을 빠르게 확보하는 것이 필요하다.

• Membrane Journal
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• v.3 no.2
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• pp.51-59
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• 1993

해수는 약 3.5%의 여러가지 염류가 용해되어 있는 수용액으로 이러한 용존염류를 제거하여 담수를 얻는 방법으로는 증발법, 냉동법 등과 같이 물의 상변화를 이용하는 방법과 역삼투압법, 전기투석법과 같이 분리막을 이용하여 압력차, 전위차로 분리하는 방법이 실용화되어 있다. 이중에서 역삼투압법은 상변화가 필요없기 때문에 소요에너지가 적고 장치가 Compact하여 설치비 및 설치부지가 적게 든다는 이점을 가지고 있으며, 특히 최근에는 우수한 분리막의 개발 및 공정기술의 향상으로 다른 공정들에 비해 경쟁력을 갖게 되었다.

• Proceedings of the Membrane Society of Korea Conference
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• 1991.10a
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• pp.56-57
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• 1991

해수로 부터 담수를 얻기 위한 방법으로는 증발법, 역삼 투압법, 전기투석법, 냉동법등을 들 수 있다. 이 중에서 역삼투압법은 상변화가 필요없기 때문에 소요 에너지가 적고 장치가 COMPACT 하여 설치비 및 설치부지가 적게든다는 이점을 가지고 있으며, 특히 최근에는 우수한 분리막의 개발 및 공정 기술의 향상으로 다른 공정들에 비해 경쟁력을 갖게 되었다. 본고는 인도네시아, WEST JAVA의 한 석유 화학 단지를 조성 하는데 있어 각 공장에 필요한 공업 용수를 일괄 공급 하기위한 해수 담수화공장 (8000 m$^3$일, 향후증설 8000 m$^3$일)을 건설하기 위한 것으로서 코오롱 엔지니어링(주)에서 수행한 타당성 조사 및 엔지니어링 결과를 토대로 작성된 것이다.

• The Microorganisms and Industry
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• v.20 no.2
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• pp.15-19
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• 1994

전기투석은 전하를 갖는 막과 전위차가 존재하는 장치에서 전해질을 분리하는 공정이다(fig. 1). 전기투석은 1980년대 이전까지는 주로 담수제조, 소금제조와 같은 무기이온제거에 사용되었으나 1980년대 들어 식품제조, 의약제조, 생물공정, 폐수처리 공정 등 다양한 방면으로 응용범위를 넓혀가고 있다. 전통적인 전기투석은 염, 산, 염기들을 수용액상에서 분리하거나 농축하는데 사용되었지만 근래에는 아미노산, 단백질을 분리하는데 전기투석의 활용연구가 시도되고 있다. 본 논문에서는 전기투석의 새로운 응용분야인 전기투석생물반응기에 대해 간단한 설명과 1980년대 후반부터의 연구논문의 소개, 그리고 전기투석에서의 간단한 물질전달이론 설명을 시도하고자 한다.