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http://dx.doi.org/10.5389/KSAE.2017.59.6.127

Effects of the Cooling and Heating System with Seasonal Thermal Storage in Alluvial Aquifer on Greenhouse Heating  

Moon, Jong Pil (National Institute of Agriculture Science)
Kang, Geum Choon (National Institute of Agriculture Science)
Kim, Hyung Gweon (National Institute of Agriculture Science)
Lee, Tae Seok (National Institute of Agriculture Science)
Oh, Sung Sik (National Institute of Agriculture Science)
Jin, Byung Ok (National Institute of Agriculture Science)
Publication Information
Journal of The Korean Society of Agricultural Engineers / v.59, no.6, 2017 , pp. 127-135 More about this Journal
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 $40m^3$, and a remote control and monitoring system were installed in three single-span greenhouses ($2,100m^2$) 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 $850m^3$ was found to flow into warm well. The temperature of the injected water was $30^{\circ}C$ (intake temperature : $15^{\circ}C$), 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 $18.5^{\circ}C$. The COP for heating with water source at $18.5^{\circ}C$ was 3.8. The intake water temperature of warm well was gradually lowered to the temperature of $15^{\circ}C$ 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 %.
Keywords
Alluvial aquifer; Greenhouse cooling and heating; Seasonal thermal storage;
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Times Cited By KSCI : 2  (Citation Analysis)
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