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최재호(Jae Ho Choi),임효재(Hyo Jae Lim),김창업(Chang Eob Kim),권정태(Jung Tae Kwon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
This study aims at analyzing the flow characteristics of the electromagnetic pump using a linear induction motor (LIM) for transferring molten metals. The flow characteristics of the pump are simulated by magnetohydrodynamic(MHD) program. In this system, the LIM is used for transferring molten metal by electromagnetic force. The molten metal is treated as the secondary part of the LIM. Since the LIM produces an electromagnetic force in the duct, the molten metal can flow from the furnace to the reservoir. The flow characteristics of the pump are analyzed using MHD program for magnetic field of 0.1[T] in duct. In order to prove the analysis, we made a prototype electromagnetic pump using LIM.
지하수 열원 복수정 지열 열펌프 시스템의 성능에 관한 실험적 연구
임효재(Hyo Jae Lim),권정태(Jeong-Tae Kwon),김창업(Chang Eob Kim),공형진(Hyoung Jin Kong),박성구(Seong Koo Park) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.8
Ground water source heat pump system is the oldest one of the ground source heat pump systems. Despite of this, little formal design information has been available until recently. The important design parameters for open system are the identification of optimum ground water flow, heat exchanger selection and well pump. In this study, the capacity of 50 RT system of two well type ground water heat pump system was used. As a result, static water level was -7 m and the level during the heating operation was -32 m, cooling operation was -40 m. The initial static water level recovered within 48 hrs. The temperature of ground water is 15.6 ℃ for heating season and 16.2 ℃ for cooling season and does not depend on the outdoor temperature. Operation efficiency of the system shows that, COP 3.1 for heating and COP 4.2 for cooling.
임효재(Lim, Hyo-Jae),손병후(Shon, Byong-Hu),정계훈(Jung, Kye-Hoon) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
This study was performed to construct a geothermal data base about thermal conductivity of ground heat exchanger and thermal properties of grouting material which used to refill the borehole. We have acquired geothermal data sets from 39 sites over wide area of South Korea except to Jeju island. From data analysis, the range of thermal conductivity is 1.5{sim}4.0 W/mK. It means that thermal conductivity varies with grouting material as well as regional geology and ground water system.
임효재(Hyo Jae Lim),정계훈(Kye Hoon Jung),한지원(Ji Won Han),박경우(Kyung Woo Park) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
This study was performed to acquire the reliable in-situ thermal conductivity of closed type ground heat exchanger used in ground source heat pump. We selected four sites(Cheonan, Daejeon, Daegu, Gwangju) which are central area of South Korea. Test results show that the effective thermal conductivities are 2.33 W/m℃, 2.50 W/m℃, 2.75 W/m℃ and 2.86 W/m℃. From this data, we can see that thermal conductivity varies about the range of 23% with the sites. Also, thermal conductivity increases up to 20% by changing grouting material from low salica sand to high one.
임효재(Hyo Jae Lim),권정태(Jung Tae Kwon),김금수(Geum Soo Kim),장기창(Ki Chang Chang) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
Geothermal energy is the heat contained in the earth and its internal fluids. Geothermal energy is stored as sensible or latent heat. Supplied by both internal and external sources, it represents a vast supply which is only started to be tapped for generation of electric power. In general, this is natural dry or wet medium to high enthalpy steam at temperatures above 150℃. For some time, binary systems employing substances with a lower boiling point than water in a secondary circuit have been used to generate vapor for driving turbines at a lower temperature level. The utilization of binary plants and the possibility of production from enhanced geothermal systems can expand its availability on a worldwide basis. The geothermal electricity installed capacity is approaching the 10,000GW threshold. Geothermal energy is not present everywhere, but its baseload capability is a very important factor for its success.
지중열교환기 설치 조건이 지중 유효 열전도도와 보어홀 열저항에 미치는 영향
임효재(Hyo Jae Lim),공형진(Hyoung Jin Kong),강성재(Sung Jae Kang),최재호(Jae Ho Choi) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.2
A ground loop heat exchanger in a ground source heat pump system is an important unit that determines the thermal performance of a system and its initial cost. A proper design requires certain site specific parameters, most importantly the ground effective thermal conductivity, the borehole thermal resistance and the undisturbed ground temperature. This study was performed to investigate the effect of some parameters such as borehole lengths, various grouting materials and U tube configurations on ground effective thermal conductivity and borehole thermal resistance. In this study, thermal response tests were conducted using a testing device to 9 different ground loop heat exchangers. From the experimental results, the length of ground loop heat exchanger affects to the effective thermal conductivity. The results of this experiment shows that higher thermal conductivity of grouting materials leads to the increase effective thermal conductivity from 22 to 32%. Also, mounting spacers have increased by 14%.
지표수 열교환기 적용 지열 히트펌프 시스템의 냉방 성능
임효재(Hyo Jae Lim),공형진(Hyoung Jin Kong),손병후(Byonghu Sohn) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.6
Commercial buildings and institutions are predominantly cooled, thereby dissipating excess heat to a vertical ground heat exchanger (VGHE), than heat extracted over an annual cycle. Surface waters, such as lakes and ponds, provide a cost-effective means of reducing the VGHE length, and in balancing the thermal loads to the ground. This paper presents the measurement and analysis of the cooling performance of ground-coupled heat pump (GCHP) system, using surface water heat exchanger (SWHE) submerged in an artificial pond. In order to measure the performance of the system, we installed monitoring equipment, including sensors, for assessing the temperature and power consumption, after which the operation parameters were determined. The results from the thermal performance test for the SWHE indicate that the temperatures at the outlet of the SWHE and within the pond were affected by outdoor air temperature. In addition, the results reveal similar variation trends on temperatures; however, the peak temperatures of the SWHE were somewhat greater than those of outdoor air, due to the thermal capacity of the pond. Analyzing the cooling performance over the measurement period, the average coefficient of performance (COP) of heat pump was found to be 5.71, while that for the entire system was 2.99.
선형유도전동기를 이용한 전자기 펌프의 특성해석 및 실험
김창업,전문호,권정태,임효재,Kim, Chang-Eob,Jeon, Mun-Ho,Kwon, Jeong-Tae,Lim, Hyo-Jae 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.6
본 논문에서는 선형유도전동기의 전자기력에 의해 용융 금속을 이송할 수 있는 전자기 펌프에 대하여 특성 해석 및 실험 결과에 대하여 제시하였다. 선형유도전동기에서 발생하는 전자기력과 전자수력학(MHD) 현상을 결합하여 용융 금속의 이송 특성을 해석하였다. 실험은 용융 아연을 대상으로 하였으며, 해석 결과와 비교 검토하였다. This paper presents the characteristics analysis and experiment of the electromagnetic pump using linear induction motor(LIM Pump) which can transfer the molten metals by the electromagnetic force. The characteristics of LIM Pump are analysed solving the magneto-hydro-dynamic(MHD) equation at various magnetic flux. The molten zinc is used in the experiment and the results we compared with the analysis.