온수배관을 이용한 시설딸기 부분난방기술 개발
Spot Heating Technology Development for Strawberry Cultivated in a Greenhouse by Using Hot Water Pipe
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초록
The effects of spot heating for growing the strawberry cultivated in a plastic greenhouse during the winter that were estimated in Nonsan strawberryexperiment station located in Chungnam. The temperature of water for heating was controlled by a electric hot water boiler and kept at the range of 22~24°C. Heating pipes were set up in root zone for root zone heating and very close to crown for crown heating. Spot heating effects were estimated byapplying spot heating system in three test factors of heating root zone, crown only and crown plus root zone. The material for crown heating pipe waswhite low density polyethylene and the nominal diameter of that pipe was 16 mm. The material for root zone heating pipe was flexible stainless steel andthe nominal diameter of that pipe was 15A. The flow rate of heating water circulation was 480 L/h and water circulation lasted for all day long. Temperatures, harvest yield by test beds were surveyed from Nov. 10, 2013 to Apr. 29, 2014. The temperature of crown spot for crown heating bed wasat the range of 13.0~17.0 °C during the night and that of crown spot in control bed was at the range of 8.0~14.0 °C. Also, the temperature of root zonefor root zone heating bed was at the range of 18~21.0 °C and that of root zone in control bed was at the range of 13.0~15.0 °C. The cumulative yieldgrowth rate in earlier harvest period (from Dec. 20 to Mar. 15) of crown heating bed was 43% compared with that of control bed and the cumulative yieldof crown plus root zone heating bed was 39 % and that of root zone heating bed was 39 %.
Abstract
The effects of spot heating for growing the strawberry cultivated in a plastic greenhouse during the winter that were estimated in Nonsan strawberryexperiment station located in Chungnam. The temperature of water for heating was controlled by a electric hot water boiler and kept at the range of 22~24°C. Heating pipes were set up in root zone for root zone heating and very close to crown for crown heating. Spot heating effects were estimated byapplying spot heating system in three test factors of heating root zone, crown only and crown plus root zone. The material for crown heating pipe waswhite low density polyethylene and the nominal diameter of that pipe was 16 mm. The material for root zone heating pipe was flexible stainless steel andthe nominal diameter of that pipe was 15A. The flow rate of heating water circulation was 480 L/h and water circulation lasted for all day long. Temperatures, harvest yield by test beds were surveyed from Nov. 10, 2013 to Apr. 29, 2014. The temperature of crown spot for crown heating bed wasat the range of 13.0~17.0 °C during the night and that of crown spot in control bed was at the range of 8.0~14.0 °C. Also, the temperature of root zonefor root zone heating bed was at the range of 18~21.0 °C and that of root zone in control bed was at the range of 13.0~15.0 °C. The cumulative yieldgrowth rate in earlier harvest period (from Dec. 20 to Mar. 15) of crown heating bed was 43% compared with that of control bed and the cumulative yieldof crown plus root zone heating bed was 39 % and that of root zone heating bed was 39 %.
참고문헌 (14)
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