• 지열에너지저널
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• 제3권2호
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• pp.19-28
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• 2007

• 지열에너지저널
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• 제7권2호
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• pp.29-45
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• 2011

• 에너지공학
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• 제15권3호
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• pp.194-201
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• 2006

온실은 작물의 성장조건을 맞추기 위해서 야간 및 추운 날에는 난방을 해야 한다. 지열원 히트펌프 시스템은 냉난방 시스템에서 두드러진 관심을 보이고 있다. 축열조를 채용한 수평형 지열원 히트펌프 시스템을 온실에 적용하여 성능특성을 조사하였다. 그리고 축열조를 채용한 이유를 자세하게 설명하였다. 축열조는 지열원 히트펌프 시스템의 난방능력보다 큰 난방부하를 대응할 수 있다. 연구 결과, 시스템전체의 성능계수는 2.69로 나타났다.

• 에너지공학
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• 제15권3호
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• pp.160-165
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• 2006

지열원 히트펌프 시스템은 난방과 냉방부분에서 두드러진 관심을 보이고 있다. 국내에 설치된 지열원 히트펌프 시스템의 대부분은 수직형 방식으로 연구대상 또한 수직형이 주류이다. 본 연구에서는 수평형 지열원 시스템을 시설하우스에 설치하여 성능을 조사하였다. 연구결과, 히트펌프만 고려한 난방성능계수는 3.64이고 지열순환펌프를 포함한 성능계수는 3.31로 나타났다. 응축기 제거열에 대한 순환펌프의 동력은 28.0 W/kW이고, 열교환기길이는 53.3m/kW였다. 지중으로부터의 평균채열량은 14.58 W/m이고, 응축열에 대한 열교환기가 매립된 트렌치길이는 27.7m/kW였다.

• 한국태양에너지학회 논문집
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• 제35권1호
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• pp.81-87
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• 2015

Recently, in order to prevent increasing energy usages in the international community, many countries have attempted to develop the innovative renewable energy systems. Among the renewable energy systems, Ground source heat pump(GSHP) system which supply the heating, cooling and hot water in the building has been attracted by its stability of heat production and high efficiency. However, the initial drilling costs become very expensive and the construction period takes longer the other systems, because GSHP system needs more than 100 m depth drilling. In this study, in order to reduce initial costs of the GSHP, the building integrated geothermal system using the horizontal heat exchanger was developed. The heating and cooling load in the standard housing model was calculated by a simulation and the system design capacity in the high-rise apartment was decided by the total load. Based on the system design capacity, the high-rise apartments were applied to a BIGS and vertical GSHP system and there are analyzed about initial costs. In the result, the initial cost of BIGS could reduce 24% of the initial cost of the vertical GSHP system.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2013년도 추계 학술논문 발표대회
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• pp.139-140
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• 2013

Ground source heat pump systems can achieve the energy saving of building and reduce CO₂ emission by utilizing stable ground temperature. However, they have many barriers such as high cost of installation, incompletion of design tool, lack of recognition as heating and cooling systems. In order to solve the problems, the building integrated geothermal system (BIGS) developed by several researches which use building foundation as a heat exchanger. In order to establish the optimum design tool of BIGS with the horizontal heat exchanger, the prediction method of ground heat exchange rate developed with numerical simulation model. In this study, the economic analysis for BIGS was conducted based on simulation results and the optimal design method was suggested. As a result, it was found that the case of 32 A, piping space 0.3 m, piping deep 0.5 m and flow rate 9.52 L/min was the best case as 50.1 W/m2 of heat exchange rate. In this case the initial cost was reduced to 115 million won.

• 설비공학논문집
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• 제25권6호
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• pp.297-302
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• 2013

The ground source heat pump (GSHP) system has attracted attention, because of its stability of heat production, and the high efficiency of the system. However, there are few studies on the prediction method of the heat exchange rate for a horizontal GSHP system. In this research, in order to predict the performance of a horizontal GSHP system, coupled simulation with a ground heat transfer model and a heat exchanger circulation model was developed, and calculation of heat exchange rate was conducted by the developed tool. In order to optimally design the horizontal GSHP system, the flow rate of circulation water, and the depth and buried spaces of heat exchangers were considered by the case study. As a result, the temperature of circulation water and the heat exchange rate of the system were calculated in each case.

• 한국지열·수열에너지학회논문집
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• 제13권2호
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• pp.22-29
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• 2017

This study is performed to performance of the combined system the GSHP (Ground Source Heat Pump) system with the Earth tube system using EnergyPlus program. The Earth tube system using fan is characteristics as supply lower (higher) air temperature than outdoor air temperature in cooling and heating seasons, the GSHP system is characteristics as small indoor air temperature variation range. As the results of Earth tube + GSHP system simulation, GSHP power can be reduced than the GSHP single operation as 17.3% in cooling seasons and 32.5% in heating seasons, the GSHP design capacity can be replaced more small size.

• 한국산학기술학회논문지
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• 제17권3호
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• pp.24-30
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• 2016

현재까지 지열 열펌프 시스템의 지중열교환기는 수직 밀폐형과 개방형 지중열교환기가 주로 설치되어 열응답시험을 이용한 열특성 평가가 수행되어 왔다. 본 논문에서는 열응답시험과 선형열원법을 이용하여 수평형 지중열교환기의 열특성을 분석하였다. 또한 지열 열펌프 시스템은 매일 단속 운전되어지므로 일일부하시험을 수행하여 수평형 지중열교환기의 지중온도 및 순환수 평균온도 일별 변화를 고찰하였다. 시험을 위해 경기도 안산에 직선식 수평형 지중열교환기(심도 2 m, 길이 50 m 8줄)를 설치하였다. 시험결과 수평형 지중열교환기의 지중 열전도율은 연중 $1.43{\sim}1.64W/m{\cdot}K$ 범위로 비교적 큰 변화가 없으며 12월에 최대값을, 5월에 최소값을 갖는 것으로 나타났다. 12일간 지중 열교환기로 하루 10시간동안 6.0 kW의 열량을 투입하는 연속 부하시험을 6월, 9월, 12월에 수행한 결과 지중온도는 이 기간 동안 각각 $4.31^{\circ}C$, $3.14^{\circ}C$, $1.21^{\circ}C$ 상승하는 것으로 나타났다.

• 설비공학논문집
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• 제24권3호
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• pp.230-239
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• 2012

Ground-coupled heat pump (GCHP) systems utilize the immense renewable storage capacity of the ground as a heat source or sink to provide space heating, cooling, and domestic hot water. The main objective of the present study is to investigate the cooling and heating performance of a small scale GCHP system with horizontal ground heat exchanger (HGHE). In order to evaluate the performance, a water-to-air ground-source heat pump unit connected to a test room with a net floor area of 18.4 m2 and a volume of 64.4 m3 in the Korea Institute of Construction Technology ($37^{\circ}39'N$, $126^{\circ}48'E$) was designed and constructed. This GCHP system mainly consisted of slinky-type HGHE with a total length of 400 m, indoor heat pump, and measuring devices. The peak cooling and heating loads of the test room were 5.07 kW and 4.12 kW, respectively. The experimental results were obtained from March 15, 2011 to August 31, 2011 and the performance coefficients of the system were determined from the measured data. The overall seasonal performance factor (SPF) for cooling was 3.31 while the system delivered heating at a daily average performance coefficients of 2.82.