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류연수(Ryoo, Yeon-Su),주혜진(Joohye-jin),김진욱(Kim jin-wook),박미란(Park mi-lan) 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.6
Government Geothermal Cooling-Heating Projects has made efforts to reduce GHG(Greenhouse Gas) emissions and to manage cost of greenhouse farm house holds.This study evaluated the economic benefits of heating load rate of change by comparing Geothermal Cooling-Heating System with the existing system(green house diesel heating) in the Government Geothermal Cooling-Heating Projects. Economic analysis results shows that, 1)When installing the Cooling-Heating system according to the ratio of 70% heating load in policy standards, the geothermal cooling-heating system has economic efficiency with green house type or scale independent because the investment cost is recovered within 7 years. And It was more economic efficiency the ratio of 50% heating load than 70% heating load. 2)When installing the Cooling-Heating system according to the glass greenhouse of the ratio of 90% heating load, pay period of investment cost is recovered within 5 years. Therefore it is necessary to apply flexible heating sharing according to greenhouse type or scale.
2000m 단일 시추공에서 밀폐 동축 방식 지중 열교환기의 취득온도 성능평가
류연수(Yeon-Su Ryoo),김재혁(Jae-Hyeok Kim),정상화(Sang-Hwa Jeong) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.4
The Korean government has been making efforts to use renewable energy to reduce the consumption of fossil fuels for the heating system in greenhouses. The number of greenhouses that installed a geothermal heat pump system is 201 EA with the volume of 132.8 ha and 108,467 ㎾ from 2010–2014. The geothermal system, called a shallow geothermal system, with the temperature of 10–20°C has accessories composed of a BHE and heat pump. Moreover, it is necessary to have a wide area to install the BHE and to drill to the depth of 200 m. On the other hand, even though the deep geothermal system needs a high drilling cost to obtain the temperature of 40–150°C, the system has the advantages of the small area required for the BHE and operation without a heat pump. In this study, the temperature of the return water and heat capacity were measured to obtain the geothermal energy efficiently on the condition of the water flow being changed in the BHE. The temperature according to the return water changes through the heat conduction based on the increase of ground temperature up to the underground depth has been calculated to conduct a simulation and is compared with the field experiment test results.
김종겸(Jong-Gyeum Kim),류연수(Yeon-Su Ryoo) 대한전기학회 2015 전기학회논문지 Vol.64 No.5
Recently, many advanced countries are devoted to the development of eco-friendly new-renewable energy to prepare for the depletion of resources. Korea belongs to the absolute lack of energy to import from abroad 97% of energy use. So, development and supply of eco-friendly energy such as small hydro power has been required even more. Our country has a large number of small-sized reservoirs and dams. So, hydro generator has been installed at the small reservoirs and dams with the economy. Since the discharge flow of agricultural reservoir is not constant, the guide vane of wicket gate is used for adjusting the output of the generator. In this study, we have confirmed that the guide vane control of water turbine under the conditions of flow variation will improve the output and efficiency of induction generator.
박미란(Park Mi-Lan),류연수(Ryoo Yeon-Su),김진욱(Kim Jin-Wook),이용욱(Lee Yong-Uk),배성돈(Bae Sung-Don),채갑병(Chae Kap-Byung) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.6
Alternative sources of energy take a higher interest in order to reduce the greenhouse gas under the Climate Change Convention, fossil fuel consumption, and lower social anxiety about nuclear power such as crisis involving the Fukushima plant, problem of obsolete equipment. The energy consumption of agriculture, forestry and fisheries in South Korea is 3,082,000toe by 2011, reliance on electrical energy(35%) and oil(57.2%) is very high with 92.2%. In this study, we examined reserves and available capacity of temperature difference energy for thermal discharge from plant, treated sewage, river water, dam, and agricultural reservoir in rural community. Reserves of unutilized energy are 455,735Tcal/yr in rural community, these accounts for 78% of total reserves 582,385Tcal/y. Thermal discharge from plant has the most reserves of unutilized energy in rural community, it is estimated that it has the reserves of 277,410Tcal/y. Available capacity of unutilized energy in rural community is total 134,147Tcal/y, thermal discharge from plant available for heating is the most 128,035Tcal/y, and it shows in the order of treated sewage 4,318Tcal/y, river water 1,653Tcal/y, and reservoir 141Tcal/y. Elevating temperature area of green house by 2012 is 21,208ha. The amount of energy required for heating the greenhouse a year is dbout 11,365Tcal/y with 8.5% of the total available capacity of unutilized energy.
수직 밀폐형 심부지열 순환 시뮬레이터의 성능 평가에 관한 연구
배정형(Jung-Hyeong Bae),이동운(Dong-Woon Lee),윤충만(Chung-Man Yoon),류연수(Yeon-Su Ryoo),정상화(Sang-Hwa Jeong) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.5
While greenhouses have been utilized as a sustainable alternative to traditional soil farming, they are often powered by diesel boilers that necessitate vast amounts of non-renewable energy and emit toxic fumes. Thus, geothermal heat pumps have been proposed as a more energy-efficient substitution for diesel boilers. Currently, most horticultural facilities in the United States use shallow geothermal systems, and are often equipped with horizontal underground heat exchangers as well as heat pump equipment. These shallow geothermal systems require a large drilling site and heat pump to function, which results in high maintenance costs. The heat pump itself consumes a large amount of power, which degrades system performance. Conversely, high temperatures can be attained within a single borehole in deep geothermal vertical closing systems without using a heat pump. This setup can dramatically reduce the power consumption and improve system performance. In this study, we have modeled a circulation simulator after the circulation systems in deep geothermal facilities to analyze a 2000-meter borehole in Naju-Sanpo-myeon. The simulator is operated by manipulating various putative parameters affecting system performance to analyze the system’s coefficient of performance.