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이세균(Lee Se-Kyoun),우정선(Woo Joung-son) 한국태양에너지학회 2008 한국태양에너지학회 논문집 Vol.28 No.5
Flashed steam system is one of the important geothermal power production methods. In this paper, optimum operations and performances of single and double flash systems are presented. It is shown that double flash system can produce about 26.5% more power than single flash system. Temperature of geothermal water(TR) is the most important parameter in the geothermal system. Optimum single and double flash temperatures and net power produced with these optimum conditions are expressed as a function of TR in this study. Thus net power output from geothermal resources can be estimated with the results of this work. Condenser Temperature(Tcon) is also important and the net power production can be shown as a function of TR-Tcon. Volume flow rate per unit power is also to be considered as the condenser temperature decreases.
이세균(李世均) 교수(敎授) 정년퇴임기념특집(停年退任紀念特輯) : 지중 열전도율이 보어홀 길이에 미치는 영향에 관한 연구
이세균 ( Se Kyoun Lee ),노정근 ( Jeong Geun Ro ) 충북대학교 산업과학기술연구소 2010 산업과학기술연구 논문집 Vol.24 No.2
The effect of soil thermal conductivity on the borehole length is studied. In performing this work the solution of line source model is used. A new concept, (L/Q) , borehole length per unit geothermal load ratio, is developed to compare the effect of soil thermal conductivity on the borehole length. It is shown that (L/Q) is a function of soil thermal conductivity(K) and onlyvery weak function of borehole thermal resistance(R(b)). There is no functional dependency of the (L/Q) on the temperature(L/Q). Thus it is easy to estimate the effect of K on the borehole length with (L/Q) . The result of this study is also examined with EED analysis.
물-물 열펌프시스템에 관한 열역학 제1 및 제2 법칙 해석
이세균(Lee Se-Kyoun),우정선(Woo Joung-Son),노정근(Ro Jeong-Geun) 한국태양에너지학회 2007 한국태양에너지학회 논문집 Vol.27 No.4
Thermodynamic analysis of water-to-water heat pump system based on the first and second law of thermodynamics is carried out in this study. This analysis shows the distribution of irreversibilities throughout the system components and informs us of a potential improvements with the temperature condition changes. Source water temperature( T A ), utilization water temperature( T D ) and temperature differences( ΔT AB’ ΔT CD) are important factors to affect system performances such as component irreversibilities, exergetic efficiency and COPH. Advantages and disadvantages with these factors are discussed. Second law optimization phenomena with T A and ΔT AB are also indicated.
선형열원법에 의한 지중유효열전도도와 보어홀 전열저항 해석
이세균(Lee Se-Kyoun),우정선(Woo Joung-Son),노정근(Ro Jeong-Geun) 한국태양에너지학회 2010 한국태양에너지학회 논문집 Vol.30 No.4
Investigation of the effective soil thermal conductivity(κ) is the first step in designing the ground loop heat exchanger(borehole) of a geothermal heat pump system. The line source method is required by New and Renewable Energy Center of Korea Energy Management Corporation in analyzing data obtained from thermal response tests. Another important factor in designing the ground loop heat exchanger is the borehole thermal resistance(R<SUB>b</SUB>). There are two methods to evaluate R<SUB>b</SUB> : one is to use a line source method, and the other is to use a shape factor of the borehole. In this study, we demonstrated that the line source method produces better results than the shape factor method in evaluating R<SUB>b</SUB>. This is because the borehole thermal resistance evaluated with the line source method characteristically reduces the temperature differences between an actual and a theoretical thermal behaviors of the borehole. Evaluation of R<SUB>b</SUB> requires soil volumetric heat capacity. However, the effect of the soil volumetric heat capacity on the borehole thermal resistance is very small. Therefore, it is possible to use a generally accepted average value of soil volumetric heat capacity(=2MJ/㎥·K) in the analysis. In this work, it is also shown that an acceptable range of the initial ignoring time should be in the range of 8∼16 hrs. Thus, a mean value of 12 hrs is recommended.