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이세균 대한기계학회 1987 대한기계학회논문집 Vol.11 No.1
본 논문에서는 순수한 액체상태의 온수 단위 질량을 대상으로 동력발생에서부 터 열펌프 까지의 가능한 응용을 고려하여 온도에 따른 최적 사용방법과 최대성능 발 휘시의 용량산정을 통하여 온수의 최적능력을 확인하고자 한다. 단 본 연구의 결과 는 순수히 열역하적인 것으로 경제적 관점에서 본다면 다소 다른 견해가 있을 수 있겠 으나 열역학적 및 경제적 관점 사이의 관계 및 제2법칙의 역할의 중요성은 이미 여러 논문에서 충분히 거론된 것으로서 여기서 언급하지 않는다. An analysis on the thermodynamic optimum use of thermal water has been accomplished. The systems investigated are power generation and space heating. The space heating systems considered in this study are direct heating, heat pumps and heat pump assisted heating. The object of this study is to find the optimum selection and operation of the system under the given resources. The measure of such optimum conditions is the EFFECTIVENESS, the concept of efficiency based upon the Second Law of Thermodynamics. The temperature of water to waste is identified as the most important parameter to be optimized. The analysis indicates that for high temperature resources (higher than about 425K) power generation yields the best performance and is therefore recommended. The heat pumps are recommended for the resource temperature less than about 327K. The heat pump assisted heating system shows its superiority for the very narrow temperature range (320K-330K) and thus the use of this system should be considered when the flow rate is very limited. thus the direct heating is appropriate for the temperature range of 330K-425K. The analysis also shows the optimum capacity of thermal water, which may be useful for the initial estimation of heating or power generation potentials of given resources.
플라스틱병을 이용한 빙축시스템의 열역학적 성능에 관한 연구
이세균,김호연,이영덕,Lee, S.K.,Kim, H.Y.,Lee, Y.D. 대한설비공학회 1996 설비공학 논문집 Vol.8 No.4
This paper presents an anlaysis on the thermodynamic performance of ice storage system. The primary interest in this work is the exergetic efficiency of the system. The ice storage system considered here is the capsule type system with the waste plastic bottle being used as a capsule. To examine the characteristics of irreversibility production and exergetic efficiency in detail the ice storage system to be analyzed has been separated from the refrigerator in this analysis. The analysis is based on the lumped model with 3 uniform temperatures. The results indicate that 3 dimensionless parameters can describe the exergetic efficiency of the system, from which the characteristics of irreversibilities and the ranges of these parameters to ensure the reasonable performance of the system can be found. Experiments also have been performed to demonstrate the feasibility of such a system. This analysis only shows the performance of ice storage side, with the refrigeration side excluded. However, the results can be interpreted as a total performance if the refrigerator coupled with the ice storage system operatres reversibly.
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.
이세균,최경빈 충북대학교 건설기술연구소 2004 建設技術論文集 Vol.23 No.1
An experimental study on the pressure losses of air through the municipal solid wastes, either dry or wet, has been carried out in this study. Generally the pressure loss increases as the air velocity and depth of solid wastes increase. However, there are some unexpected phenomena for the dry wastes with high air velocity and low depth due to the strong floating effects of solid wastes. Such effects are also shown in wet wastes when the moisture content is not sufficiently high. The results of this study are useful in designing the dimension of second combustion chamber of multi-stage combustion incinerator.
이세균,문병수,남승백,김기덕 대한기계학회 1992 대한기계학회논문집 Vol.16 No.9
본 연구에서는 대수층을 시뮬레이션한 실험장치를 통하여 온도분포를 관찰하 고 자연대류에 관한 단순화된 이론적 모델을 개발하여 실험치와 비교 검토하고자 한 다. Experiments have been performed on the thermal behavior in a liquid saturated porous medium in a system to simulate a single well aquifer thermal energy storage system. The principal interests in this study are the combined effects of forced and natural convection. Significant buoyancy flow due to natural convection is developed quickly as the temperature difference between the injection and original aquifer temperature increases. Theoretical model under simplified assumptions (called simple buoyancy flow model in this study) has been developed. The results of this model agree well with the experiments. The effects of buoyancy flow on the recovery factor are also examined in this study.
1차원 수치모델과 현지측정에 의한 지중열전도율 및 보어홀 전열저항 해석에 관한 연구
이세균,노정근,김대기,우정선 대한설비공학회 2006 설비공학 논문집 Vol.18 No.10
A one-dimensional numerical model coupled with parameter estimation is used to predict the effective thermal conductivities of soil formations and borehole resistances from in situ field test data. In this application a new method of using initial ignoring time(IIT) obtained from error estimation is tried and turned out to be successful in determining soil thermal conductivities. This method is used for single-U and double-U borehole system. The results of this method are compared and agreed well with those of existing software(GPM) in the analysis of single-U borehole data. In the analysis of double-U borehole data this method seems to be better in predicting soil and borehole properties.
이세균,김규형 충북대학교 건설기술연구소 2001 建設技術論文集 Vol.20 No.2
A theoretical exergy analysis of a water-to-water heat pump is presented. An optimized evaporating temperature is found according to the condition of supplying water as a heat source and hot water obtained as a heat sink. This paper also shows the effect of producing both hot and cold water on the thermodynamic performance. Substantial increase of exergetic efficiency and COP can be obtained with this system.
이세균,우정선,이재효,김한덕 대한설비공학회 2000 설비공학 논문집 Vol.12 No.2
This paper investigates the thermodynamic performance of latent heat thermal energy storage system using two phase change materials(2-PCM system). The thermodynamic merit of using 2-PCM is clear in terms of exergetic efficiency, which is substantially higher than that of 1-PCM system. Optimum phase change temperature to maximize the exergetic efficiency exists for each case. The heat transfer area ratio of high temperature storage unit, X, becomes another important parameter for 2-PCM system if the phase change temperatures of given materials are different from those of optimum conditions. It is a good approximation for X$_{opt}$ to be 0.5 when optimum phase change temperatures are used. Otherwise X$_{opt}$ is determined differently as a function of given phase change temperatures.res.