• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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• pp.331-335
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• 2004

This study is focused to analyze the movement of thermal effluent dischargeed from nuclear power plant by season, ebb and flow, and before and after foundation of tide embankment using thermal infrared band image of 28 scenes observed from Landsat from 1987 to 2004, which is the early stage of operation of young-kwang nuclear power plant. In diffusion of thermal effluent discharge by seasons, spring and summer is spreading further than autumn and winter. It is considered to distribute widely mixed with thermal effluent discharge and hot water, which is distributed naturally along the seaside. It is known the fact that tidal currents control the direction of diffusion of thermal effluent discharge by the change of ebb and flow. Namely, it is distributed widely on the Southwest direction along the seaside by tidal currents when ebb and, it is moved widely on the Northeast direction along the seaside by tidal current when flood. However, in the early stage of flood current, the mainstream of thermal effluent discharge is spread on Southwest direction and, the direction is changed on North­east way when the latter period of flood current. Similarly, in the early stage of ebb current, the mainstream of thermal effluent discharge is spread on Northeast direction and, the direction is changed on Southwest direction when the latter period of ebb current. As the result of comparing to the diffusion pattern of thermal effluent discharge before and after the foundation of seawall, discharged thermal effluent from the drain of plant by the foundation of dike is shown as curved circle pattern on Northeast to West direction from the ending portion of the seawall.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.323-329
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• 2002

The thermal effluent discharged from nuclear power plants can affect the offshore ecosystem change. The ability of measuring sea surface temperature in high resolution with Airborne MSS thermal spectral band(8.5 $\mu$m ~ 12.5 $\mu$m) and Landsat ETM+(10.4$\mu$m ~ 12.5 $\mu$m) gives us an information of spread range of thermal effluent. This information can be used as one of major factors fur analyzing the impact of the fish farm damage around the nuclear power plants. Every season from November 1999, this research has been conducted to investigate the extent of diffusion of thermal effluent discharged from KoRi, UlJin and WolSung Nuclear Power Plant located at the coastline of the East Sea of Korea.

• Journal of Advanced Marine Engineering and Technology
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• 제34권4호
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• pp.470-476
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• 2010

발전소 온배수 및 폐열을 이용한 1 MW급 폐쇄형 해양온도차발전 사이클에 대한 성능을 비교 분석하였다. 폐쇄형 해양온도차발전 사이클에 대한 열역학적 모델은 랭킨 사이클이고, 기화기 증발 열원으로 발전소 온배수를 이용하여 사이클 효율, 기화기 및 응축기 열량 등 사이클 성능을 비교 분석하였다. 발전소 온배수 온도가 증가함에 따라 기화기 내 증발 포화압력은 상승하게 되고 그로 인해 사이클 효율은 증가하였고, 총 출력 1 MW에 필요한 기화기 및 응축기 용량은 감소하였다. 따라서 발전소 온배수는 폐쇄형 해양온도차발전에서 주요한 열원으로 사용될 수 있음을 알 수 있었다. 또한, 주위 이용 가능한 폐열이 있을 때 기화기 출구 작동유체와 열교환시켜 터빈으로 유입되는 작동유체의 온도를 상승시킨다면 사이클 효율은 크게 증가할 것이다.

• Korean Journal of Hydrosciences
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• 제6권
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• pp.67-79
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• 1995

The reattachment of buoyant efflluent to a shore in a crossflow is investigated experimentally. The effluent is prodeced by discharging heated water through a projected side channel into a confined crossflow of the same depth. In the projecting effluent, the size of recirculating region, which is formed by deflected thermal plume on the lee of the effluent, tends to increase, but the maximum temperature decreases in the direction of the crossflow and it has more uniform transverse spreading compared to non-projected type. The heat flux across the crossflow is found to be independent of the projceted length of the side channel under relatively high buoyancy flux on the contrary to low buoyancy flux. The reattachment of th effluent can be specified by both velocity ratio and densimetric Froude number, whereas only the velocity ratio is governing factor to the reattachment of the effluent in the case of non-projecting type.

• 물과 미래
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• 제27권3호
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• pp.123-134
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• 1994

돌출방류수로에 의하여 동일한 수심의 개수로에 방류되는 부력방류에 의한 연안귀환이 수리실험에 의하여 해석되었다. 부력방류는 온수를 방류하여 발생된다. 돌출방류로 인하여 부력류 하류에 형성되는 재순환영역의 크기는 비돌출방류에서 보다 증가하는 경향을 갖으나 황온도분포는 균일하고 횡단면 최대온도는 감소를 나타낸다. 높은 부력흐름율과는 반대로 낮은 부력흐름율 조건에서 단면평균온도 또는 열흐름율은 돌출길이의 영향이 무시할 정도이다. 비돌출의 경우에는 연안귀환에 유속비가 지배적인 매개변수이었으나 돌출방류의 경우에는 유속비와 후르드수가 다같이 지배적인 인자로 나타났다.

• Water Engineering Research
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• 제6권1호
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• pp.1-15
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• 2005

The numerical model, FLUENT, was employed to investigate the effect of the heated water discharged from the diffuser of Boryung Power Plant. Temperature patterns of the thermal effluent discharged from two proposed types of the diffusers was evaluated for maximum flood and maximum ebb tide. The hydraulic model experiments were also performed in the reduced scale of 1/150 to verify the numerical simulation results. The buoyant jets discharged from the diffusers were found to be significantly affected by the ambient flows beyond the region where the effluent momentum was dissipated. Both the numerical and experimental results showed that the area of the excess isotherm for Type 1 diffuser was larger than that for Type 2 diffuser. Type 2 diffuser system was observed to be a more effective diffuser design than Type 1 diffuser system based on the temperature reduction and excess isotherm obtained from the numerical simulation in the ambient flows.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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• pp.190-190
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• 2011

In South Korea the gross generation and heated effluent of power generation plant was 259 TWh and 4.73 billion tons in 2008. And then the waste heat from power generation was 388 TWh. It shows that the efficiency of thermal power generation plant is about 40%. Therefore to reduce $CO_2$ emission from thermal power generation plant, the energy of this heated effluent must be reused to heat buildings or farm facilities. In South Korea horticultural facilities of about 25% are heated in winter season. Total area of greenhouses which are heated is about 13,000 ha. Total heat amount needed to warm greenhouse of 13,000 ha in winter season is only 3.4% of total waste heat from power generation plant. In this study a heat pump system was designed to reuse the waste heat from power generation. Especially new heat exchanger was developed to recover the thermal energy from waste water and this model considered anti-corrosion against sea water and low cost for economic feasibility. This heat recovery system was installed in mango growing greenhouse around thermal power generation plant in Seogwipo-city, Jeju Special Self-Governing Province. The result of preliminary test shows that the heating cost of about 90% is saved as compared to boiler using tax free light oil as a fuel.

• 한국해양공학회지
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• 제28권3호
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• pp.245-253
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• 2014

This research analyzed the current situation and problems with an environmental impact assessment to provide a rational ocean physics assessment technique for power plant thermal effluent. This research also tried to create an improvement plan for heated effluent diffusion impact assessment by examining the reporting regulations for environmental impact assessment, national and international evaluation guidelines, etc. In the case of evaluating the oceanographic impact of heated effluent discharged from power plants, a pre-investigation is necessary before a full-scale presentence investigation, to accurately predict and minimize power plant construction effects on the surrounding environments. Before this presentence investigation, moreover, an integrated presentence plan, which agrees with the business plan, effect prediction, and post-investigation, needs to be established. A sufficient summit investigation must be made, which considers climate changes, and new and additional power plant construction. For accurate long-term oceanic environmental change prediction, the credibility of effect prediction must be elevated by presenting an evaluation method that is categorized by numerical organization models, verification methods, result presentation, and other things. Furthermore, unproductive conflicts between the people involved in heated effluent evaluation should be reduced by these improvement plans.

• 에너지공학
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• 제28권1호
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• pp.22-29
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• 2019

발전소 온배수의 폐열을 회수하여 인근 농가에 난방 에너지를 공급하는 열펌프 시스템은 기존 난방방식 대비 에너지 사용량을 획기적으로 절감하고 온실가스의 배출을 줄이는 데에 기여할 수 있다. 제주대학교 컨소시움은 한국중부발전 제주화력본부에서 약 3 km의 원거리에 위치하고 있는 시설온실로 냉온수를 공급하기 위한 열펌프 시스템을 구축하였다. 본 논문에서는 열펌프 시스템의 구성과 더불어, 2018년 동절기에 수행된 난방성능 평가 실증운전 결과를 기술하였다. 열펌프 가동운전 시 대부분의 공급열 수송배관 내 담수의 온도강하는 $2^{\circ}C$ 이하로 유지됨을 확인하였다. 난방운전 시 열펌프의 성능계수는 4.0 보다 크며, 온배수를 열원으로 활용하여 최대 $50^{\circ}C$의 온수를 농가로 지속적으로 공급할 수 있음을 입증하였다.

• 신재생에너지
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• 제3권4호
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• pp.47-53
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• 2007

Effluent ground water overflow in deep and broad ground space building. Temperature of effluent ground water is in $12{\sim}20^{\circ}C$ annually and the quality of that water is as good as living water. Therefore if the flow rate of effluent ground water is sufficient as source of heat pump, that is good heat source and heat sink of heat pump. Effluent ground water contain the thermal energy of surrounding ground. So this is a new application of ground source heat pump. In this study open type and close type heat pump system using effluent ground water was installed and tested for a church building with large and deep ground space. The effluent flow rate of this building is $800{\sim}1000ton/day$. The heat pump capacity is 5RT each. The heat pump cooling COP is $4.9{\sim}5.2$ for the open type and $4.9{\sim}5.7$ for close type system. The system cooling COP is $3.2{\sim}4.5$ for open type and $3.8{\sim}4.2$ for close type system. This performance is up to that of BHE type ground source heat pump.