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Heat Transfer Characteristics of Coil Tube Heat Exchanger for Hot Water Heating of Greenhouse Thermal Tunnel

보온터널 난방을 위한 온수난방용 코일튜브 열교환기의 열전달 특성

  • Ryou, Y.S. (National Institute of Agricultural Engineering) ;
  • Kang, K.C. (National Institute of Agricultural Engineering) ;
  • Kim, Y.J. (National Institute of Agricultural Engineering) ;
  • Paek, Y. (National Institute of Agricultural Engineering) ;
  • Kang, Y.G. (National Institute of Agricultural Engineering) ;
  • Lee, H.M. (National Institute of Agricultural Engineering)
  • Published : 2006.10.25

Abstract

Greenhouse horticulture in South Korea covered about 52,000 ha in 2005. Greenhouse area of about 12,000 ha has been heated during winter season with heating cost of $20{\sim}40%$ of total Production cost. Farmers engaged in greenhouse horticulture were changed into aged people. Therefore the laborsaving of working process and the saving of greenhouse heating cost should be accomplished simultaneously to increase income of greenhouse horticulture. The best method for saving of greenhouse heating cost is to install thermal tunnels into greenhouse. Then hot air heaters using fossil fuel should be changed into hot water heaters. In other words air heating using forced convection should be changed into natural convection system. In this research coil tube made of flexible PE pipe was designed as hot water heat exchanger and its heat exchanging characteristics were analyzed. This new heat exchanger has been adopted as a natural convection system for hot water heating of greenhouse horticulture.

Keywords

References

  1. Ryou, Y. S., G. C. Kang, Y. J. Kim, Y. Paek and Y. G. Kang 2004. Heating performance of coil tube heat exchanger for greenhouse thermal tunnel. Proceedings of the KSAM 2004 Winter Conference 9(1): 396-400
  2. Ryou, Y. S., G. C. Kang, Y. J. Kim and Y. Paek. 2002. Energy saving effect of a greenhouse with new laborsaving opening & closing system of thermal tunnel film. Proceedings of the KSAM 2004 Winter Conference 7(2): 255-260
  3. Ministry of Agriculture & forestry. 2003. Business Report: pp 62-64

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