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동계 매트형 수평형 지중 열교환기의 수직형 지중 열교환기와 비교 및 열적 성능 분석
이상하(Sang Ha Leigh),장휴산(Hyusan Jang),유석(Shuo Liu),이태하(Tae Ha Leigh),여명석(Myoung Souk Yeo) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
국내에서 대부분의 지열 히트펌프는 수직형 지중 열교환기와 결합되어 사용 중이다. 수직형 지중 열교환기는 설치 시 천공을 뚫는데 큰 비용이 발생하는 데 비해, 수평형 지중 열교환기는 천부에 설치하므로 설치 비용이 비교적 적게 든다. 반면 수직형 지중 열교환기에 비해 외기의 영향을 받아 상대적으로 안정적인 성능을 내지 못하고, 넓은 대지 면적이 필요하다. 수평형 지중 열교환기 중 열교환 성능이 좋은 모세유관을 활용한 매트형 수평형 지중 열교환기의 수직형 지중 열교환기 대비 열적 성능을 알아보고자 하며, 시뮬레이션을 통해 비교 분석을 진행하였다. 본 연구에서 난방기 매트형 수평형 지중 열교환기 한 모듈의 지중 열교환 성능은 약 500W로 15m 수직형 지중 열교환기와 비슷하였다.
동계 매트형 수평형 지중 열교환기의 수직형 지중 열교환기와 비교 및 열적 성능 분석
이상하(Sang Ha Leigh),장휴산(Hyusan Jang),유석(Shuo Liu),이태하(Tae Ha Leigh),여명석(Myoung Souk Yeo) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
국내에서 대부분의 지열 히트펌프는 수직형 지중 열교환기와 결합되어 사용 중이다. 수직형 지중 열교환기는 설치 시 천공을 뚫는데 큰 비용이 발생하는 데 비해, 수평형 지중 열교환기는 천부에 설치하므로 설치 비용이 비교적 적게 든다. 반면 수직형 지중 열교환기에 비해 외기의 영향을 받아 상대적으로 안정적인 성능을 내지 못하고, 넓은 대지 면적이 필요하다. 수평형 지중 열교환기 중 열교환 성능이 좋은 모세유관을 활용한 매트형 수평형 지중 열교환기의 수직형 지중 열교환기 대비 열적 성능을 알아보고자 하며, 시뮬레이션을 통해 비교 분석을 진행하였다. 본 연구에서 난방기 매트형 수평형 지중 열교환기 한 모듈의 지중 열교환 성능은 약 500W로 15m 수직형 지중 열교환기와 비슷하였다.
지중열 이동 시뮬레이션을 이용한 수평형 지열시스템의 채열성능 예측
남유진(Yujin Nam),채호병(Ho-Byung Chae) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.6
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.
토양 열전도도와 수분함량이 수평형 지중열교환기 설계 길이에 미치는 영향
손병후(Byonghu Sohn) 한국지열·수열에너지학회 2012 한국지열에너지학회논문집 Vol.8 No.1
This paper reviewed and evaluated some of the commonly used prediction models for thermal conductivity of soils with the experimental data. Semi-theoretical models for two-component materials were found inappropriate to estimate the thermal conductivity of dry state soils. It came out that the model developed by Cote and Konrad gave the best overall prediction results for unsaturated soils available in the literature. However, it still needs to be improved to cover a wider range of soil types and degrees of saturation. In the present study, parametric analysis is also conducted to investigate the effect of soil type and moisture content on the horizontal ground heat exchanger design. The analysis shows that horizontal ground heat exchanger pipe length is reduced with the increase of soil thermal conductivity and water content. The calculation results also show that horizontal ground heat exchanger size can be reduced to a certain extent by using backfilling material with a higher thermal conductivity of solid particles.
토양 종류와 수분함량이 수평형 지중열교환기 설계에 미치는 영향
손병후(Byonghu Sohn),위지혜(Jihae Wi),윤상봉(Sangbong Yoon),최항석(Hangseok Choi) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
Because of their low operating and maintaining costs, geothermal heat pump (GHP) systems are an increasingly popular choice for providing heating and cooling to residential and commercial buildings. Despite these advantages and the growing awareness, GHP systems using horizontal ground heat exchanger have not been adopted in Korea until recently. A great number of parameters including soil thermo-physical properties influence on the dimensioning of the horizontal ground heat exchanger. In the present study, parametric analysis is conducted to investigate the effect of soil type and moisture content on the horizontal ground heat exchanger design. The analysis shows that horizontal ground heat exchanger pipe length is reduced with the increase of soil thermal conductivity and water content. The calculation results also show that horizontal ground heat exchanger size can be reduced to a certain extent by using backfilling material with a higher thermal conductivity of solid particles.
지중열이동 해석 모델을 이용한 수평형 지열시스템의 채열량 예측에 관한 연구
채호병(Ho-Byung Chae),남유진(Yujin Nam) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.11
Ground source heat pump(GSHP) system has been attracted by its stability of heat production and high efficiency of the system. However, there are few studies on the prediction method of the heat exchange rate for the horizontal ground heat pump system. In this research, in order to predict the performance of horizontal geothermal 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. As the result, the heat exchange rate of horizontal system including temperature of the circulation water and underground was calculated.
수평형 지중열교환기의 열전달 및 압력강하 특성에 관한 수치해석적 연구
공민석,이경호 한국기계기술학회 2019 한국기계기술학회지 Vol.21 No.5
Heat transfer and pressure drop of horizontal heat exchangers with different configurations and installations numerically characterized. Three different heat exchangers were used and shaped as linear, wavy, and horizontal slinky, respectively. Installation depth was set from 0.5m to 3.0m and pipe spacing was ranged from 0.3m to 2.1m. The results showed that heat transfer rate and pressure drop were increased with the increase in the installation depth and the pipe spacing. The horizontal slinky heat exchanger carried more heat compared to others due to the greater effective heat transfer surface area per installation area. In terms of a ratio of heat transfer rate to pressure drop indicating the system efficiency, the linear heat exchanger performed better than others. On the other hand, the horizontal slinky heat exchanger was the most effective with respect to a ratio of heat transfer rate to installation cost.
이중 탐침법을 이용한 수평형 지중열교환기 뒤채움재의 열확산계수 측정
손병후(Byonghu Sohn),최항석(Hangseok Choi) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
수평형 지중열교환기를 설계할 때 파이프 주변의 토양 또는 트렌치 뒤채움재의 열확산계수는 중요한 설계 변수다. 열확산계수는 지중열교환기 사양과 초기 투자비 등에 영향을 미치며 아울러 장기간에 걸친 성능 확보에도 관여하기 때문에, 정확한 값을 예측하고 설계에 적용하는 것은 매우 중요하다. 따라서 본 논문에서는 수평형 지중열교환기의 프렌치 뒤채움재로 사용되는 모래-불-공기 불포화 혼합물의 열확산계수를 측정하였다. 이를 위해 이중 탐침법(dual-probe method)을 적용하였으며, 기존 단일 탐침법에 의한 결과와 비교하였다. 아울러 간극률, 수분함량, 입자 열전도도 등이 열확산계수에 미치는 영향을 고찰하였다. Storage and transfer heat in soils is governed by the soil thermal properties and these properties are therefore needed in many engineering applications, including horizontal ground heat exchanger for ground-coupled heat pumps. This paper presents the measurement results of the thermal diffusivity of soils (silica, quartzite, limestone, sandstone, granite, and masonry soils) used for the trench backfilling materials of the horizontal ground heat exchanger. To assess this thermal property, we (ⅰ) measure the soil thermal conductivities and volumetric heat capacities using dual-probe method and (ⅱ) compare the estimates from the de Vries method of summing the heat capacities of the soil constituents. The results show that the thermal diffusivity tends to increase as dry soil begins to wet, but it approaches a constant value or even decreases as the soil continues to wet. Measurements made by using the dual-probe method agreed well with independent estimates obtained using the de Vries method.
정민호(Chung, Minho),박성룡(Park, Seongryong),나호상(Ra, Hosang),백영진(Baik, Youngjin),윤형기(Yoon, Hyungkee),장기창(Chang, Kichang) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
Ground source heat pump systems are used for heating, ventilating and air-conditioning systems in commercial buildings, schools, and factories because of low operating and maintenance costs. These systems use the earth as a heat source in heating mode and a heat sink in cooling mode. Ground heat exchangers are classified by a horizontal type and vertical type according to the installation method. A horizontal type means that a heat exchanger is laid in the trench bored in 1.2 to 1.8 m depth. The solar heat and the rainwater are affected by the performance of heat exchanger and causes mutual influence among heat exchangers. In this study, to evaluate the performance of straight type, slinky type, and spiral type of horizontal ground heat exchangers designed on 1 RT scale, test sections are buried on the earth and experimental apparatus is installed. Therefore the performance of these is estimated.
이중탐침법을 이용한 수평형 지중열교환기 뒤채움재의 열확산계수 측정
손병후(Byonghu Sohn),최항석(Hangseok Choi) 한국지열·수열에너지학회 2011 한국지열에너지학회논문집 Vol.7 No.2
Storage and transfer heat in soils are governed by the soil thermal properties and these properties are therefore needed in many engineering applications, including horizontal ground heat exchanger for ground-coupled heat pumps. This paper presents the measured results of the thermal diffusivity of soils (silica, quartzite, limestone, sandstone, and masonry soils) used for the trench backfilling materials of the horizontal ground heat exchanger. To assess this thermal property, we (i) measure the soil thermal conductivities and volumetric heat capacities using dual-probe method and (ii) compare the estimates from the de Vries method of summing the heat capacities of the soil constituents. The results show that the thermal diffusivity tends to increase as dry soil begins Lo wet, but iL approaches a constant value or even decreases as the soil continues to wet. Measurements made by using the dual-probe method agreed well with independent estimates obtained using the single-probe method.