Heating Performance of Hot Water Supplying System in Greenhouse
2012
Yoon, Y.C., Gyeongsang National University, Jinju, Republic of Korea | Shin, Y.S., Graduate School, Gyeongsang National University, Jinju, Republic of Korea | Kim, H.T., Gyeongsang National University, Jinju, Republic of Korea | Bae, S.B., T.O.P TECH, Business Incubator Center, Changwon Moonsung College, Changwon, Republic of Korea | Choi, J.S., S.H.E.C. Co., Ltd., Goseong, Republic of Korea | Suh, W.M., Gyeongsang National University, Jinju, Republic of Korea
This research was conducted to obtain basic data with regard to the heating performance that would be produced by installing an aluminum hot water pipe inside the greenhouse with the goal of reducing the heating energy in greenhouse. The research results are summarized as follows. The degree of difference in relation to the temperature by height within the greenhouse during the entire experiment was significant - within the range of 4.0~7.0℃. The temperature difference between incoming and outgoing water was about 3.3℃ greater when FCU was activated compared to when it was not activated. Meanwhile, the amount of energy consumed increased about 36.2~40.1%. The amount of pyrexia per hour also increased by 44.6~52.0%. During the experiment period, circulated flux was within the range of 0.48~0.49 Lㆍs-¹ while average fluid speed was 1.53~1.56 mㆍs-¹. The average temperature difference between incoming and outgoing water was 6.24~11.50℃. The amount of heating value by each set temperature within the minimum outdoor temperature range of -14.0~-0.6℃ was 135,930~307,150 kcal, and the range was within the 9,610~19,630 kcalㆍh-¹ per hour. This demonstrated that about 23~53% heating energy of the maximum heating load could be supplied. Total radiating value and amount of energy consumed were 2,548,306 kcal and 3,075.7 kWh, respectively. When heating takes place using oil, which is a fossil fuel, the total amount of light oil consumed was 281.6 L while the cost was 321,000 won. When the electricity cost for farms is applied, the total cost was about 110,730 won, which is about 33.5% of the cost required compared to oil consumption. The temperature at in the experiment area was about 8.3~14.6℃ higher compared to that of the control area.
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