• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2009년도 춘계학술발표대회 논문집
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• pp.139-144
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• 2009

The generation of small hydropower as compared to other different developed environmental methods produces one of the clean energies. In such manner, various application system development through IT technique is being developed for an advanced small hydropower energy resources data mining. However, existing data analysis of New & Renewable Information System for small hydropower resources application is incomplete therefore it limits expressing these information on the Web. Thus for positive usage of small hydropower resources, a more systematic and precise analysis system should be built. This study seeks to develop a map of the domestic small hydropower resources problems to further improve small hydropower resources, developed through Package Tool which can accurately evaluate a wide range of small hydropower basin in a short period of time. Small hydropower Package Tool was calculated using existing Analysis System small hydropower resources which did not provide diverse capabilities resulting to 840 standard basin classified by A and facility capacity, etc., and to assume a 40% annual capacity, expected annual electricity production was calculated. Small hydropower for the national water system of small hydropower resources potential calculated in terms of resources for the development of small hydropower will be utilized as basic data.

• International Journal of Advanced Culture Technology
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• 제3권1호
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• pp.101-112
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• 2015

Renewable energy resources play an important part in the world's future. Renewable energy sources have the following components: biomass, geothermal, solar thermal, directs solar, wind, tidal and hydropower. Hydropower is still the most efficient way to generate electricity worldwide. Hydropower projects can contribute as a cheap energy source, as well to encourage the development of small industries across a wide range of new technology; furthermore hydropower systems use the energy in flowing and falling water to produce electricity or mechanical energy. Hydropower systems are classified as large, medium, small, mini and micro according to their installed power generation capacity, as do the following components: water turbines, control mechanisms and electrical transmissions. In this article a review of small hydropower systems has been done on the principles surrounding the fundamentals of hydraulic engineering, the fundamentals of hydrology, identification of sites and economic analysis.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회B
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• pp.2079-2084
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• 2007

A small-scale thermoelectric cooling system was built in an effort to enhance the performance of the refrigeration system by utilizing the water-cooled jacket which was attached on the hot side of the thermoelectric module. Considered design parameters for the water-cooled jacket included the geometry of the flow passage inside the jacket and the flow rate of cooling water. The higher flow rate of cooling water in the jacket resulted in a better performance of the refrigeration system. The introduction of geometrical complexity of the cooling water flow passage to the cooling jacket also showed significant improvement on the performance of the thermoelectric refrigeration system such as the cooling capacity and the COP of the refrigeration system.

• 한국수자원학회논문집
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• 제41권6호
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• pp.643-651
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• 2008

본 연구는 소규모 수리시설물이 장기유출에 끼치는 영향에 대해 시 공간적으로 상세히 분석하고, 분석된 결과를 토대로 장기유출 모의모형에 소규모 수리시설물의 영향을 반영할 수 있도록 구성함으로서 유역의 장기유출 모의결과의 신뢰도를 증진시키는 것이 목적이다. 따라서 본 연구에서는 대상유역의 소규모 수리시설물 현황을 파악하고 각 수리시설물별로 하천유량에 끼치는 영향을 분석한 후, 수리시설물의 영향을 고려할 수 있도록 강우-유출 모형을 구축하였다. 수리시설물에 의한 영향평가를 실시한 결과, 공간적으로는 저수지가 많이 분포한 소유역에서, 시기적으로는 강우가 풍부했던 2003년을 제외한 2/4분기에서 모형상 에러인 음의 유량 발생빈도가 크게 나타났다. 따라서 본 연구에서는 수리시설물의 영향평가를 토대로 유출량과 수리시설물의 상관식을 유도하였으며 이를 이용하여 강우-유출 모의를 재구성하였다. 그 결과 모의유량은 상대적으로 수리시설물을 고려하지 않은 경우보다 오차가 크게 감소하였다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2015년도 학술발표회
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• pp.221-221
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• 2015

Sustainable use of water resource and conservation of water quality are essential problems in the world. Especially, problems of water quality are serious one for human health as well as ecological system of all creatures on the earth. Recently, the importance of total effluent load as well as the concentrations of pollutant materials has been recognized not only for the conservation of water quality but also for sustainable water use in watersheds. However, the measurement or estimation of total effluent load from non-point source area such as farm lands or forests may be more difficult because both of concentration and discharge of the water are greatly changed depending on various factors especially metrological conditions such as rainfall, while the measurement from a point source area may be easy because the concentration of pollutant materials and amount of discharge water are relatively steady. Therefore, the total effluent load from a non-point source is often estimated by statistical relationships between concentration and discharge, which is called as L-Q equation. However, a lot of work and time are required to collect and analyze water samples and to get the accurate relationship or regressive equation. So, we proposed a new system for direct measurement of total effluent load of water quality from non-point source areas to solve the problem. In this system, the overflow depth at a hydraulic weir is measured with a pressure gage every hourly interval to calculate the amount of hourly discharge at first. Then, the operating time of a small electric pump to collect an amount of water which is proportional to the discharge is calculated to intake the water into a storage tank. The stored water is taken out a few days later in a case of storm event or several weeks later in a case of non-rainfall event and the concentrations of water quality such as total nitrogen and phosphorous are analyzed in a laboratory. Finally, total load of the water quality can be calculated by multiplying the concentration by the total volume of discharge. The system was installed in a small experimental forestry watershed to check the performance and know the total load of water quality from the forest. It was found that the system to collect a proportional amount of water to actual discharge operated perfectly and a total load of water quality was analyzed accurately. As the result, it was expected that the system will be very available to know the total load from a non-point source area.

• 한국지열·수열에너지학회논문집
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• 제18권1호
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• pp.12-19
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• 2022

Desalination has the advantage of being easy to supply water resources. However most desalination devices are developed mainly for large plants and it is not common to use desalination system for a small fishing ship. More than 50% of the input fuel energy of the small shipbuilding's engine is wasted without reused in a ship, and it is necessary to improving the fuel efficiency of the small fishing ship. In this study, a desalination device using waste heat from engine of the ships was developed. As results, it was found that if the condensing chamber uses a fan to circulate the water vapor, the freshwater production was up to 40.0% higher, and the freshwater production efficiency was up to 30.1% increased when the fan was operated.

• 한국해안·해양공학회논문집
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• 제21권5호
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• pp.391-404
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• 2009

삼천포 화력발전소에서 냉각수로 이용되고 방류되는 해수를 이용한 소수력 발전소를 건설하였다. 본 연구에서는 해양소수력 발전소 건설시 가장 중요한 문제인 기존 화력발전소의 순환수 계통에 미치는 영향을 평가하기 위한 방안으로 배수로 수위의 해양소수력 건설 이전, 건설 중, 건설 이후 해양소수력 운전 상태에서의 변화를 예측한 값과 실제 계측값을 분석하였다. 설계시 일반적으로 이용되는 개수로 수리식에서부터 Flow 3D를 이용하여 3차원적인 수리해석 기법을 이용하는 것까지 다양한 예측을 시도하였고 관측을 통하여 검증하고자 하였다. 예측치와 실제 관측치의 비교 결과, 수위의 전체적인 평균값은 예측치와 관측치가 유사하였지만 수위의 변화 폭은 건설 중과 해양소수력 운전 상태에서 매우 크게 나타났다. 또한, 소수력 건설 이전에는 표준위어식과 Honma식의 예측값이 관측값과 가장 유사하였으나, 소수력 건설 이후에는 HEC-2, HEC-RAS, Flow-3D의 예측값이 실측값과 가까운 결과를 보였다.

• 한국방재학회 논문집
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• 제10권2호
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• pp.103-110
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• 2010

소수력은 신재생에너지 중 하나로 우리나라에는 부존량이 매우 풍부하여 최근 개발에 대한 필요성이 대두되고 있다. 이러한 소수력 자원의 적극적인 활용을 위해 소수력 자원량 산정의 정확성을 제고하고, 소수력 지리정보시스템을 이용한 에너지원 발굴의 기반환경이 필요하다. 본 연구에서는 연평균강우량, 유역면적, 유출계수를 세분화시켜 840개의 표준유역에 대한 소수력 발전소 시설용량과 연간전기생산량을 산정하였으며, 산정된 소수력 자원량과 분석기능, 그리고 국내 소수력 자원지도시스템에서 제공되지 않았던 소수력 발전소 현황, 하천, 유역, 강우관측소, 수위관측소 등에 대한 기초정보를 제공하여 소수력 지리정보시스템을 구축하였다. 구축된 소수력 지리정보시스템은 전국에 산재되어 있는 소수력 자원의 적극적인 활용을 위한 기초정보로 활용될 수 있을 것으로 사료된다.

• 한국염색가공학회지
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• 제13권1호
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• pp.55-60
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• 2001

Cotton fabric was deed with a reactive dye in water/dichloromethane two-phase immiscible solvent media. In order to minimize dye loss due to its hydrolysis, the reactive dyeing was carried out in dichloromethane containing a small amount of water. With only 2ml of water in 23m1 of dichloromethane, 1.0g of cotton fabric could be dyed perfectly. The uptake ratio was increased greatly, compared with that of normal reactive dyeing in a waters medium. It would seem that the one of hydrophobic solvents, dichloromethane, can assist the eden dyeing as it disperses a small amount of dye-dissolved water phase and conveys this water phase to the fabric entirely and uniformly.

• 교육시설 논문지
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• 제18권3호
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• pp.35-41
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• 2011

Performance of a small-capacity solar absorption cooling system was investigated experimentally. Ten sets of evacuative-tube solar-heat collectors and a 5 kW single-stage absorption cooler were combined to produce a hybrid cooling system. The performance of the cooling system was measured using a tim-coil unit installed in a small plastic storage. It was found from the test on a sunny day of May that when the temperature of the hot water supplied from the solar collectors to the generator of the absorption cooler reached $60^{\circ}C$, the absorption cooler started cooling and the cold water temperature measured from the fan-coil unit reached $18^{\circ}C$. The COP, which is defined as the ratio of the cooling power to the total electrical power input was higher than 1.0.