충적대수층 계간축열 냉난방 시스템의 온실 난방 효과
Effects of the Cooling and Heating System with Seasonal Thermal Storage in Alluvial Aquifer on Greenhouse Heating
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
In this study, a cold well and a warm one with the distance of 100 m were installed in the alluvial aquifer. Groundwater used as the heat and the cold source of heat pump was designed to flow into the warm and the cold well with a diameter of 200 mm. In order to increase the heat and cold storage in aquifer, six auxiliary wells with the diameter of 50 mm and the depth of 30 m were installed at an interval of 5 m from the main well. Also, heat pump 50 RT, the thermal tank 40 m3 , and a remote control and monitoring system were installed in three single-span greenhouses (2,100 m2) for growing tomato in Buyeo, Chungcheongnam-do. According to the aquifer heat storage test which had been conducted from Aug. 31 to Sep. 22, 2016, warm water of 850 m3 was found to flow into warm well. The temperature of the injected water was 30 ℃ (intake temperature : 15 ℃), and the heat of 12.8 Gcal was stored. The greenhouse heating test in winter had been conducted from Nov. 21, 2016 to Apr. 30, 2017. On Nov. 21, 2016 when heating greenhouse started, the aquifer temperature of the warm well was 18.5 ℃. The COP for heating with water source at 18.5 ℃ was 3.8. The intake water temperature of warm well was gradually lowered to the temperature of 15 ℃ on Jan. 2, 2017 and the heat pump COP was measured to be 3.2 at that time. As a result, the heat pump COP was improved by 18 %. and retrieval heat was 8 Gcal, the retrieval rate of heat stored in aquifer was estimated at 63 %.
Abstract
In this study, a cold well and a warm one with the distance of 100 m were installed in the alluvial aquifer. Groundwater used as the heat and the cold source of heat pump was designed to flow into the warm and the cold well with a diameter of 200 mm. In order to increase the heat and cold storage in aquifer, six auxiliary wells with the diameter of 50 mm and the depth of 30 m were installed at an interval of 5 m from the main well. Also, heat pump 50 RT, the thermal tank 40 m3 , and a remote control and monitoring system were installed in three single-span greenhouses (2,100 m2) for growing tomato in Buyeo, Chungcheongnam-do. According to the aquifer heat storage test which had been conducted from Aug. 31 to Sep. 22, 2016, warm water of 850 m3 was found to flow into warm well. The temperature of the injected water was 30 ℃ (intake temperature : 15 ℃), and the heat of 12.8 Gcal was stored. The greenhouse heating test in winter had been conducted from Nov. 21, 2016 to Apr. 30, 2017. On Nov. 21, 2016 when heating greenhouse started, the aquifer temperature of the warm well was 18.5 ℃. The COP for heating with water source at 18.5 ℃ was 3.8. The intake water temperature of warm well was gradually lowered to the temperature of 15 ℃ on Jan. 2, 2017 and the heat pump COP was measured to be 3.2 at that time. As a result, the heat pump COP was improved by 18 %. and retrieval heat was 8 Gcal, the retrieval rate of heat stored in aquifer was estimated at 63 %.
참고문헌 (15)
- Anibas, C., "Assessment of seasonal aquifer thermal energy storage as a groundwater ecosystem service for the Brussels-capital region : combining groundwater flow, and heat and reactive transport modeling", Energy Procedia, 97, pp.179~185 (2016)
- Gehlin, S., "Geothermal energy use, country update for Sweden", European Geothermal Congress, 2016, pp.1~11 (2016)
- Hwang, K. S., "The field test of bank filtration (including alluvial and riverbed deposits)source heat pump cooling & heating system", Proceedings of the 2006summer annual conference of the society of Air-conditioning and Refrigeration Engineer of Korea, pp.1186~1190 (2006)
- Kim, J. C., "Numerical modeling of aquifer thermal energy storage system", Energy, 35, pp.4955~4965 (2010)
- Kim, M. G., "Agricultural structures engineering" (2000), Hyangmunsa
- 이동기, "강변여과 취수시 과도한 지하수 하강을 저감시키기 위한 인공함양의 활용방안 연구", 지질공학, 14(4), pp.391~400 (2004), 대한지질공학회
- 임효재, "지하수 열원 복수정 지열 열펌프 시스템의 성능에 관한 실험적 연구", 설비공학 논문집, 21(8), pp.468~474 (2009), 대한설비공학회
- Midttømme, K., "Ground-source heat pumps and underground thermal energy storage—energy for the future", Geological Survey of Norway Special Publication, 11, pp.93~98 (2008)
- Moon, J. P., "Development of ground filtration water source heat pump for greenhouse heating system", Proceedings of the American Society of Agricultural Engineers’Annual International Meeting (2011)
- Palmer, C. D., "Thermal energy storage in an unconfined aquifer : 1. Field injection experiment", Water Resources Research, 28(10), pp.2845~2856 (1992)
- Rural Development Administration, "Protected horticulture energy saving guide book for overcoming high oil price" (2008), Sangroksa
- Rural Development Administration, "Heat loss auditing casebook for agricultural facility" (2009), Sangroksa
- Ryou, Y. S., "Heating and cooling effect of protected horticulture by geothermal heat pump system with horizontal heat exchanger", Proceedings of the 2008 spring annual conference of The Korean society for New and Renewable Energy, pp.630~633 (2008)
- "Aquifer thermal energy storage in the Netherlands, status beginning of 2005. IFTech International reference" (2005)[URL]
- Sommer, W., "Optimization and spatial pattern of large-scale aquifer thermal energy storage", Applied Energy, 137, pp.322~337 (2015)