http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
물 대 물 방식 수직 밀폐루프 지열원 히트펌프 시스템의 냉방성능에 대한 실험적 연구
홍부표(Boo-Pyo Hong),최광환(Kwang-Hwan Choi) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.1
A vertical closed loop ground source heat pump(GSHP) is used to produce heat from the low-grade energy source such as the outside air and ground source. It is known that a heat pump system type has better efficiency comparing to the electric heating system. This study only demonstrates that the vertical closed loop GSHP system is a feasible choice for space cooling of air conditioning. The coefficient of performance (COP) is the ratio of heat output to work supplied to the system in the form of electricity. For the vertical closed loop GSHP system in a cooling mode, the COP is the most commonly used way for judging the efficiency. For the purpose of this experiment, vertical closed loop GSHP system was installed in the laboratory and the experiment was executed. As a result, an average COP of vertical-closed loop GSHP system was 3.62 when the outside average temperature was 33℃.
직접순환식 수직밀폐형 지열원 열펌프의 연간 운전성능 평가
김민성(Kim Minsung),우정선(Woo Joungson),백영진(Baik Young-Jin),장재철(Jang Jeachul),김지영(Kim Ji-Young),라호상(Ra Ho-Sang) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3
Vertical closed-loop ground source heat pump systems(GSHP) have been installed widely in Korea since it can extract moderate temperature level of geothermal heat in a small area. As a ground heat exchanger, a vertical closed-loop type with brine circulation is mostly preferred since it is simple and less harmful to ground environment. However, it requires a secondary heat exchange loop between the refrigerant in a heat pump and the brine. By adding a geothermal heat exchanger in the secondary heat exchange loop, circulation pumps should be attached and the temperature difference between refrigerant and ground is increased, which are important pats of performance degradation. In this paper, annual and seasonal performances of direct expansion(DX) geothermal heat pump were estimated mathematically as an alternative of classical indirect geothermal heat pump based on the annual performance evaluation. As a result, DX geothermal heat pump showed 43% higher annual performance than the classical U-tube geothermal heat pump.
사무시설에 수직형 지열원 냉·난방시스템의 경제성을 고려한 인입온도(EWT)에 관한 연구
이병두(Byung-Doo Lee),이대우(Dae-Woo Lee),이세진(Se Jin Lee) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
Recently, Vertical-Closed Loop system using geothermal which is the most efficient among the building cooling and heating systems is coming into wide spread due to assistance of domestic policies. However, there is a limitation that a design of ground heat exchanger taking 60% of construction cost is done by GLD and GLHEPRO programs without specific guidelines and consideration on Entering Water Temperature(EWT). For getting an optimal EWT, we analyzed the costs for construction of ground heat exchanger and cooling and heating for 15 years. In the results, reduction of construction costs as the length of ground heat exchanger shortens was much greater than increase of the electrical power consumption as COP gets low. EWT that COP of heat pump can be 3.76 or above was below 31℃ in cooling and was over 5℃ in heating.
물 대 물 방식 수직-밀폐루프 지열원 히트펌프시스템의 난방 성능에 대한 실험적 연구
홍부표(Boo-Pyo Hong) 산업기술교육훈련학회 2013 산업기술연구논문지 (JITR) Vol.18 No.3
In the area (37.55 N, 126˚84 E) to get the data for the design and heating performances of heat pump for water to water system, the experiments were run. The vertical-closed loop ground source heat exchanger was installed under the 150m of ground from surface. The temperature, flow rate and electric power was measured. Released heat was 17,989.91kcal/h, used electric power 4,71kW/h and COP 4.44, and the average out side temperature was -8.64℃. Also the capacity of water was sufficient for supply ing the heating system.
일반공조 시스템 대비 축열조와 연동된 수직밀폐형 지열히트펌프의 냉난방 에너지 성능 및 경제성 분석
김민지(Kim, Min-Ji),도성록(Do, Sung-Lok),최종민(Choi, Jong-Min),이광호(Lee, Kwang Ho) 대한건축학회 2018 大韓建築學會論文集 : 構造系 Vol.34 No.11
Among various types of geothermal heat pump systems, Vertical Closed-Loop Geothermal Heat Pump (VGSHP) has received increasing attention due to a variety of advantages such as the potential to be installed in a relatively small space and improved energy efficiency. In this research, the performance of VGSHP system coupled with heat storage tank was evaluated, by analyzing operational behavior of heat storage tank, the variations of heat pump energy performance due to the connection with heat storage tank, part load ratios characteristics of heat pump and the corresponding energy cost, compared to chiller and boiler based conventional system. The results of this study showed that the VGSHP system coupled with heat storage tank showed an energy saving effect of about 18% for cooling and about 73% for heating, and annual heating/cooling energy cost reduction of 43,000,000 KRW ($ 39,000), compared to the conventional air conditioning system. In addition, after considering both energy cost and initial investment cost including equipment, installation and auxiliary device expenses, payback period of approximately 11.8 years was required.
인천국제공항 3단계 건설부지에 적합한 지중열교환기 시스템 평가 연구
조남현,송정태,윤석,이승래 한국지반공학회 2015 한국지반공학회논문집 Vol.31 No.5
In the present study, a ground heat exchanger was installed for each heat source in the system at the site to evaluateground heat conductivity, constructability, and economic feasibility; the factors considered in the study included groundheat, groundwater, fillers (such as bentonite and pea pebbles) and the shape of the heat exchange pipe (e.g., U andD-U). The aim was to determine the ground heat exchanger appropriate for the geothermal system in the 3th-phaseconstruction of Incheon International Airport. A comparative cost analysis of the initial costs based on the aboveinformation showed that although the initial costs of the regular vertical closed loop-II and modified vertical closedloop were lower than those of the regular vertical closed loop-I, they could not be expected to deliver high economicefficiency from the viewpoint of constructability (filler injection, heat exchange pipe insertion). The initial costs prouedto be higher in the case of Geohil.
현장 열응답 시험(TRT)과 CFD 역해석을 통한 지반의 열전도도 평가
박문서,이철호,박상우,손병후,최항석 한국지반공학회 2012 한국지반공학회논문집 Vol.28 No.12
In this study, a series of CFD (Computational Fluid Dynamics) numerical analyses were performed in order to evaluate the thermal performance of six full-scale closed-loop vertical ground heat exchangers constructed in a test bed located in Wonju. The circulation HDPE pipe, borehole and surrounding ground formation were modeled using FLUENT, a finite-volume method (FVM) program, for analyzing the heat transfer process of the system. Two user-defined functions (UDFs) accounting for the difference in the temperatures of the circulating inflow and outflow fluid and the variation of the surrounding ground temperature with depth were adopted in the FLUENT model. The relevant thermal properties of materials measured in laboratory were used in the numerical analyses to compare the thermal efficiency of various types of the heat exchangers installed in the test bed. The simulation results provide a verification for the in-situ thermal response test (TRT) data. The CFD numerical back-analysis with the ground thermal conductivity of 4 W/mK yielded better agreement with the in-situ thermal response tests than with the ground thermal conductivity of 3 W/mK.
김민성(Minsung Kim),우정선(Joungson Woo),백영진(Young-Jin Baik),나호상(Ho-Sang Ra) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
지열원 열펌프 시스템은 재생에너지원 중 상대적으로 작은 공간에서 열원 추출이 가능하여 국내에 널리 적용되어 왔다. 지중열교환기로서 에탄올 부동액이 순환되는 수직밀폐형이 선호되어 왔는데, 이는 설비나 시공이 비교적 단순하고 지중환경에 유해한 영향이 적기 때문이다. 그러나 지중열교환기는 지중순환수와 열펌프의 작동냉매와의 열교환을 수행하는 지열열교환기가 필수적으로 요구되는데, 지중순환수의 매개적 역할로 인하여 지열열교환기와 지중순환펌프 등이 추가 설비로서 요구된다. 이러한 2차유체 순환루프는 지중온도와 냉매온도간의 차이를 증가시키고 지중순환펌프의 동력에 대한 에너지손실이 상대적으로 크게 되어 지열원 열펌프의 열손실에 중요한 영향을 미친다. 본 연구에서는 이의 대안으로 지중순환루프에 냉매가 직접 순환하여 열교환을 하는 직접순환식 지중열교환기와 이를 적용한 열펌프 시스템에 대하여 소개하고자 한다. Ground source heat pump systems(GSHP) have been installed widely in Korea since it can extract renewable heat resources in a small area. As a ground heat exchanger, a vertical closed-loop type with brine circulation is preferred since it is simple and less harmful to ground environment. However, it requires a geothermal heat exchanger between the refrigerant in a heat pump and the brine. By adding a secondary heat exchange loop, circulation pumps should be attached and the temperature difference between refrigerant and ground is increased, which are important parts of performance degradation. In this paper, direct exchange(DX) geothermal heat pump is introduced as an alternative.
수직 밀폐형 지중열 교환기 설계 조건에 대한 천공 깊이 변화에 관한 연구
노상태 대한건축학회지회연합회 2014 대한건축학회연합논문집 Vol.16 No.1
전 세계적으로 화석에너지가 고갈되어가고 있으며 1997년 교토의정서가 발효되고, 건물에너지 효율등급, 에너지소비 총량제 등의 정부정책이 시행됨에 따라 신재생에너지 설치가 중요시 되고 있다. 본 연구에서는 국내의 지역별 지열 도입현황을 파악하고, 신재생에너지중 지열의 핵심 요소인 지중열 교환기, 그 중에서도 현재 건축물에 가장 많이 사용되고 있는 수직밀폐형 지중열 교환기의 여러 설계 변수와 보어홀(천공) 깊이 간 상관관계를 파악하고자 한다. 본 연구에서는 GLHEPRO와 EnergyPlus를 이용해 지중열교환기의 여러 설계 변수를 적용하여 길이의 변화와 최대에너지 생산량의 변화를 고찰하였으며, 지중열교환기의 길이에 가장 큰 영향을 미치는 변수로는 파이프 관경, 파이프와 보어홀벽과의 간격, 지중열전도도를 들 수 있으며, 이 변수 들은 최대 냉난방에너지 생산량에도 타 변수에 비해 큰 영향을 미쳤다.