J.of Soc of Agri Struc, Japan.
Vol.22,No.1 July 1991,5-8
Original:
Language: Japanese

    This research was undertaken to investigate how some improvement of internal side curtain films and the well-water spraying system in a twin-span greenhouse affects the thermal insulation characteristics during the coldest season.
    The twin-span greenhouse was covered with PVC, and had an internal movable roof curtain with the well-water spraying system of 4 m-interval nozzles, two movable curtains, and a single fixed side curtain. The overall heat transfer coefficient of this greenhouse was calculated at 1.81 W.m^-2.deg^-1.
    In the above-mentioned greenhouse, the overall heat transfer coefficient changed into 1.36 W.m^-2.deg^-1, when the internal side curtain with a single-layered film was replaced with the one with double-layered film.
    When the well-water spraying system was changed by replacing the hard plastic pipe with 4 m-interval nozzles with the plastic film tube with 3 cm-interval pores, and was applied to the first greenhouse, the overall heat transfer coefficient became 1.77 W.m^-2.deg^-1.
When this system was applied to the side curtain as well as to the internal movable curtain, the overall heat transfer coefficient was calculated at 1.25 W.m^-2.deg^-1.

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