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몽골의 천부 지열에너지(냉난방 에너지)개발 가능성에 관한 연구
한정상(Jeongsang Hahn),윤운상(Yun Sang Yoon),윤건신(Kern Sin Yoon),이태열(Tae Yul Lee),김형수(Hyong Soo, Kim) 한국지열·수열에너지학회 2012 한국지열에너지학회논문집 Vol.8 No.2
Time-series variation of groundwater temperature in Mongolia shows that maximum temperature is occured from end of October to the first of February(inter time) and minimum temperature is observed from end of April to the first of May(summer time). Therefore ground temperature is s a good source for space heating in winter and cooling in summer. Groundwater temperatures monitored from 3 alluvial wells in Ulaabaatar at depth between 20 and 24 m are (4.43±0.8)℃ with average of 4.21℃ but mean annual ground temperature(MAGT) at the depth of 100 m in Ulaanbaatar was about 3.5~6.0℃. Bore hole length required to extract 1 RT’s heat energy from ground in heating time and to reject 1 RT’s heat energy to ground in summer time are estimated about 130 m and 98 m respectively. But in case that thermally enhanced backfill and U tube pipe placement along the wall are used, the length can be reduced about 25%. Due to low MAGT of Ulaabaatar such as 6℃, the required length of GHX in summer cooling time is less than the one of winter heating time. Mongolia has enough available property, therefore the most cost effective option for supplying a heating energy in winter will be horizontal GHX which absorbs solar energy during summer time. It can supply 1 RT’s ground heat energy by 570 m long horizontally installed GHX.
한정상(Jeongsang Hahn),윤운상(Yun Sang Yoon),김영식(Youngseek Kiem),한찬(Chan Hahn),박유철(Yu-Chul Park),목종구(Jong-Gu Mok) 한국지열·수열에너지학회 2012 한국지열에너지학회논문집 Vol.8 No.3
Mongolia has three(3) geothermal zones and eight(8) hydrogeothermal systems/regions that are, fold-fault platform/uplift zone, concave-largest subsidence zone, and mixed intermediate-transitional zone. Average temperature, heat flow, and geothermal gradient of hot springs in Arhangai located to fold-fault platform/uplift zone are 55.8℃, 60~110 ㎽/m2 and 35~50 ℃/㎞ respectively and those of Khentii situated in same zone are 80.5℃, 40~50 ㎽/m2, and 35~50 ℃/㎞ separately. Temperature of hydrothermal water at depth of 3,000 m is expected to be about 173~213°C based on average geothermal gradient of 35~50 ℃/㎞. Among eight systems, Arhangai and Khentii located in A type hydrothermal system, Khovsgol in B type, Mongol Altai plateau in C type, and Over Arhangai in D type are the most feasible areas to develop geothermal power generation by Enhanced Geothermal System (EGS). Potential electric power generation by EGS is estimated about 2,760 ㎾ at Tsenher, 1,752 ㎾ at Tsagaan Sum, 2,928 ㎾ at Khujir, 2,190 ㎾ at Baga Shargaljuut, and 7,125 ㎾ at Shargaljuut.
하천-충적대수층계의 강변여과수를 열원으로 이용하는 지하수 열펌프 시스템의 계절별 입구온도와 효율성 평가
한찬(Chan Hahn),전재수(Jae-soo jeon),윤운상(Yoon-Sang Yoon),한혁상(Hyok-Sang Han),한정상(Jeong-Sang Hahn) 한국지열·수열에너지학회 2007 한국지열에너지학회논문집 Vol.3 No.2
Unconsolidated and permeable alluvial deposit composed of sand and gravel is distributed along the fluvial plain at the Iryong study area. Previous studies on the area show that a single alluvial well can produce at least 1,650m3d-1 of bank infilterated shallow groundwater(BIGW) from the deposit. This study is aimed to evaluate and simulate the influence that seasonal variation of water levels and temperatures of the liver have an effect on those of BIGW under the pumping condition and also to compare seasonal variation of COPs when indirectly pumped BIGW or directly pumped surface water are used for a water to water heat pump system as an heat source and sink using 3 D flow and heat transport model of Feflow. The result shows that the magnitude influenced to water level of BIGW by fluctuation of river water level in summer and winter is about 48% and 75% of Nakdong river water level separately. Seasonal change of river water temperature is about 23.7 ℃, on other hand that of BIGW is only 3.8℃. The seasonal temperatures of BIGW are ranged from minimum 14.5℃ in cold winter(january) and maximum 18.3℃ in hot summer(July). It stands for that BIGW is a good source of heat energy for heating and cooling system owing to maintaining quite similar temperature(16℃) of background shallow groundwater. Average COPh in winter time and COPc in surnmer time of BIGW and surface water are estimated about 3.95, 3.5, and about 6.16 and 4.81 respectively. It clearly indicates that coefficient of performance of heat pump system using BIGW are higher than 12.9% in winter time and 28.1% in summer time in comparision with those of surface water.
실물 실험을 통한 태양광 모듈의 표면온도와 태양광 발전량과의 관계에 대한 연구
조성우(Sung-Woo Cho) 한국지열·수열에너지학회 2018 한국지열에너지학회논문집 Vol.14 No.3
PV module power is calculated on PV module surface temperature adjustment by irradiation on the summer and autumn in NOCT(Nominal Operating Cell Temperature) conditions. The summer and autumn periods were selected because of large variation in outdoor air temperature and irradiation. This study was performed to understand relationship between PV module surface temperature and photovoltaic power using field measurement. As a results, it was determined that the amount of irradiation was proportional to the amount of photovoltaic power in the field measurement. However, it was also identified that the PV power generation decreased by increased PV module surface temperatures due to irradiation.
에너지 성능 기반의 기계설비배관 단열기준 개선을 위한 연구
윤희원,류형규 한국 지열 · 수열에너지학회 2021 한국지열에너지학회논문집 Vol.17 No.4
The need for zero-energy building is increasing as a means of actively responding to climate change. Since pipe insulation is a factor that minimizes heat loss of cooling and heating facilities, it is necessary to check pipe insulation standards and prepare improvement plans of preparation for certification of zero energy buildings. In this study, domestic pipe insulation standards were checked to prepare new insulation standards based on energy performance. Through the development of a pipe insulation calculation program, the heat loss according to the insulation thickness of the piping for mechanical facilities was compared and reviewed. As a result, applying the insulation thickness of the KCS standard for the same conditions increased the heat loss by an average of 10% compared to the ASHRAE standard. For this reason, it is necessary to revise the pipe insulation thickness standard in consideration of heat loss due to thermal conductivity and pipe insulation thickness. Using the program in this paper, it is possible to design pipe insulation based on energy performance and help to determine the standard for pipe insulation thickness.
바닥복사 난방시스템의 밸브구동 특성을 고려한 실내 열환경 성능 개선 연구
송재엽,안병천 한국 지열 · 수열에너지학회 2021 한국지열에너지학회논문집 Vol.17 No.4
In this study, to improve the indoor thermal environment of the radiant floor heating system, a study was conducted on the temperature change characteristics and energy consumption according to the change of the indoor air set temperature, the supply hot water temperature and the outdoor temperature. As for the control method, the on/off control and the thermal difference proportional control method proposed through previous studies were applied. In addition, in consideration of field applicability, numerical analysis was performed for the case where the indoor air temperature sensor was affected by the wall temperature. As a result, it was found that the temperature difference proportional control method is more effective for thermal comfort and energy saving than on/off control.