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Study on the Cooling Effect of Double-Layer Spray Greenhouse

Author

Listed:
  • Jihang Xu

    (College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
    These authors contributed equally to this work.)

  • Weitao Bai

    (Beijing Kingpeng International Hi-Tech Corporation, Beijing 100094, China
    These authors contributed equally to this work.)

  • Jian Wang

    (College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China)

  • Zhihui Mu

    (College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China)

  • Weizhen Sun

    (Beijing Kingpeng International Hi-Tech Corporation, Beijing 100094, China)

  • Boda Dong

    (College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China)

  • Kai Song

    (College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China)

  • Yalan Yang

    (College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China)

  • Shirong Guo

    (College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China)

  • Sheng Shu

    (College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China)

  • Yu Wang

    (College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China)

Abstract

Greenhouses provide suitable environmental conditions for plant growth. Double-layer plastic greenhouses are often used in many regions to ensure normal crop growth during winter since single-layer plastic greenhouses have poor insulation. However, during summer, the high insulation of double-layer plastic greenhouses, combined with excessive external solar radiation, can cause high temperatures inside the greenhouse that are not suitable for plant growth and require cooling. In this study, we propose a double-layer spray greenhouse using a high-pressure spraying system that is placed inside the double film that allows for additional cooling capacity during the summer in order to sustain plant growth. A greenhouse platform test was set up to investigate the optimum operating conditions for the nozzles and to explore changes in greenhouse microclimate under different nozzle operating conditions. The results show that (1) the cooling rate increases with increasing water supply pressure, nozzle diameter and spraying time, and the humidification rate is consistent with the change in the rate of cooling. (2) The optimal condition for cooling in this experiment is achieved with a 120° double nozzle with a nozzle diameter of 0.30 mm, a water supply pressure of 6 MPa, and a spraying time of 15 min, which can reduce the temperature by up to 5.36 °C and serve as a reference for the summer cooling of the double-layer greenhouse.

Suggested Citation

  • Jihang Xu & Weitao Bai & Jian Wang & Zhihui Mu & Weizhen Sun & Boda Dong & Kai Song & Yalan Yang & Shirong Guo & Sheng Shu & Yu Wang, 2023. "Study on the Cooling Effect of Double-Layer Spray Greenhouse," Agriculture, MDPI, vol. 13(7), pages 1-16, July.
    • Handle: RePEc:gam:jagris:v:13:y:2023:i:7:p:1442-:d:1199707
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    References listed on IDEAS

    as
    1. Xu, J. & Li, Y. & Wang, R.Z. & Liu, W. & Zhou, P., 2015. "Experimental performance of evaporative cooling pad systems in greenhouses in humid subtropical climates," Applied Energy, Elsevier, vol. 138(C), pages 291-301.
    2. Cheng, Wen-Long & Han, Feng-Yun & Liu, Qi-Nie & Fan, Han-Lin, 2011. "Spray characteristics and spray cooling heat transfer in the non-boiling regime," Energy, Elsevier, vol. 36(5), pages 3399-3405.
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