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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.
생활특성에 따른 바닥복사난방 공간의 열쾌적 범위에 관한 연구
김상훈(Sang-Hun Kim),정광섭(Kwang-Seop Chung),김영일(Young-Il Kim) 한국지열·수열에너지학회 2015 한국지열에너지학회논문집 Vol.11 No.1
This study has been purposed to provide thermal comfort range in accordance with the residential style of radiant floor heating space, and to compare it with the thermal comfort range at predicted mean vote. The survey for the thermal sensation vote to the subjects and the measurement of environmental factors has been executed, and regression analysis has been performed. It is interpreted that the combination of the physical factor and the psychological factor results lower neutral point of the floor sitting style than that of the chair sitting style. There are some difference between the measured predicted mean vote and the thermal sensation vote via survey, which appears to be caused by distinctive heat transfer characteristic of floor radiant heating space, such as, high radiant temperature and contact thermal sensation of floor surface.
박종일(Jong-Il Park),박률(Ryul Park) 한국지열·수열에너지학회 2012 한국지열에너지학회논문집 Vol.8 No.1
This study aims to analysis domestic energy consumption in Korea and reduction greenhouse gas by building mechanical system. At this point be tormented the energy depletion and climate change of earth are big problems on the earth. In this paper we will find out best methods to reduction greenhouse gas and energy consumption by practical building mechanical system. Enlargement of greenhouse and building adopt, greenhouse gas exhaust reduction in building, publication of energy consumption rate, publish building energy management manual, etc.
R452B 냉매 적용 물대물 지열원 히트펌프 유닛의 냉난방 운전 성능 특성
최연성,강희정,김은오 한국 지열 · 수열에너지학회 2017 한국지열에너지학회논문집 Vol.13 No.4
Refrigerant having high global warming potentials will be phased out due to environmental protection issues. R410A has been widely used in geothermal heat pump. However, it has a little high GWP by 2088 value. One of the recommended substitute for R410A refrigerant is R452B which having a GWP by 698 value. In this paper, the heating and cooling performance of the water-to-water geothermal heat pump unit with R452B was experimentally investigated. The performance of the heat pump adopting R452B was also compared with the system applying R410A. The heating and cooling capacity of R452B heat pump system showed a slightly lower values within 2% comparing with R410A system. However, the R452B system’s coefficient of performance was enhanced by 5.2% and 13.7% at heating and cooling mode, respectively.
지중온도회복을 고려한 지열 히트펌프 시스템의 운전방법 검토
배상무(Sangmu Bae),전재영(Jae-Young Jeon),권영식(Young Sik Kwon),남유진(Yujin Nam) 한국지열·수열에너지학회 2020 한국지열에너지학회논문집 Vol.16 No.4
Ground source heat pump (GSHP) systems are actively introduced as cooling and heating conditioning systems of buildings due to annual stable performance and easily maintenance. However, ground temperature imbalance is occurred when the GSHP is used for a long period. Therefore, in this study, we proposed the operation method of the system that considered the recovery time of heat source temperature. The entering water temperature (EWT) and heat exchange rate (HER) were comparatively analyzed according to the continuous and intermittent operation. Furthermore, the underground thermal environment was evaluated by numerical analysis model. As the result, the intermittent operation was a maximum of 12.3% higher HER during the heating period than the continuous operation. In addition, the overall ground heat source temperature at the intermittent operation was higher than it at the continuous operation.