수직형 지열히트펌프 시스템의 육묘 온실 냉방 효과 분석 = Analysis on Cooling Effects of the Vertical Type Geothermal Heat Pump System Installed in a Greenhouse for Raising Seedling

국문 초록 (Abstract)

본 연구에서는 농가현장에 보급되어 있는 350kW (175kW × 2대)급 수직형 지열히트펌프시스템으로 1,650m2면적의 육묘온실에 2011년 6월 7일부터 9월 18일까지냉방실험을 수행하여 냉방성능을 분석하고, 농가현장에서 지열히트펌프를 가동함에 있어 보다 효과적인 운용방법을 고려해보고자 하였다.
증발기측 물 온도차는 증발기 입구 물온도가 26.4℃에서 17.1℃로 변할 때 최대 1.7℃, 최소 0.9℃ 차이(평균1.3℃)를 보였으며, 증발기 입구 물온도가 16.6℃에서13.1℃로 변할 때 최대 1.1oC, 최소 0.8℃(0.9℃) 차이를보였다.
히트펌프를 1대(175kW × 1대) 가동하는 경우, 증발기입구에 유입되는 물온도 13.0~15.5℃(응축기 입구에 유입되는 물온도 19.4~21.2℃) 범위에서 냉방성능계수는1.1~1.8, 발생한 냉방열량은 68.2~106.8kW, 소비전력은61.0kW, 히트펌프를 2대(175kW × 2대) 가동하는 경우,증발기 입구 물온도 10.0~13.0℃(응축기 입구에 유입되는 물온도 18.5~22.2℃) 범위에서 냉방성능계수는 2.0~2.7, 냉방열량은 203.9~262.0kW, 소비전력은 95~98kW 이었다.
6월의 누적 냉방열량은 14,718.6kWh(12,657,996kcal), 누적소비전력은 6,352.0kWh이었으며, 7월은 각각 26,765.1,11,600.0kWh, 8월은 각각 28,437.2, 12,508.0kWh, 9월은10,065.0, 5,125.0kWh로 8월이 가장 큰 냉방열량을 나타내었다.

다국어 초록 (Multilingual Abstract)

In this study, the cooling experiment was carried out in 1,650 m2 area of the seedling greenhouse fromJune 6, 2011 to september 18, 2011 with the vertical type geothermal heat pump system of 350 kW scale (175 kW ×2 units) installed in the greenhouse, cooling effects were analyzed and we tried to find more effective operationmethods of the geothermal heat pump system. In case of one unit heat pump (175 kW) operation, when evaporatorinlet water temperature changed from 13.0℃ to 15.5℃, cooling COP of the system was in 1.1~1.8 range and in caseof two unit heat pump (350 kW) operation, when evaporator inlet water temperature changed from 13.0 to 15.5,cooling COP of the system was in 2.0~2.7 range. The accumulated cooling heat quantity of June, July, August andSeptember was 14,718.6, 26,765.1, 28,437.2 and 10,065.0 kWh, respectively.

참고문헌 (Reference)

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