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Estimating the Thermal Properties of the Cover and the Floor in a Plastic Greenhouse

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  • Hyung-Kweon Kim

    (Department of Agricultural Engineering, National Institute of Agricultural Sciences, RDA, Jeonju 54875, Korea)

  • Young-Sun Ryou

    (Department of Agricultural Engineering, National Institute of Agricultural Sciences, RDA, Jeonju 54875, Korea)

  • Young-Hwa Kim

    (Department of Agricultural Engineering, National Institute of Agricultural Sciences, RDA, Jeonju 54875, Korea)

  • Tae-Seok Lee

    (Department of Agricultural Engineering, National Institute of Agricultural Sciences, RDA, Jeonju 54875, Korea)

  • Sung-Sik Oh

    (Department of Agricultural Engineering, National Institute of Agricultural Sciences, RDA, Jeonju 54875, Korea)

  • Yong-Hyeon Kim

    (Department of Bio-Industrial Machinery Engineering, Jeonbuk National University, Jeonju 54896, Korea)

Abstract

This study comprehensively analyzed the heat loss and total heat transfer coefficient (U-value) of a single-span experimental plastic greenhouse covered with a double layer of 0.1 mm thick polyethylene. The air temperature and heat flux (W m −2 ) of the greenhouse components were measured from 18:00 to 06:00, and the energy balance equations under steady-state conditions were determined. The heat flux and U-value of the roof, sides, front and rear, and floor of the greenhouse were determined and compared. The results showed that these values for the roof play an important role in determining the heat load in the greenhouse, and that the average heat transfer through the floor is very small. The average U-value of the greenhouse cover is a comprehensive value which takes the U-values of the roof, sides, and front and rear into account through the use of an area–weighted average method. Finally, an average U-value of 3.69 W m −2 °C −1 was obtained through the analysis of the variations in the U-value, as it is related to the difference in air temperature between the interior and exterior of the greenhouse, as well as to the outdoor wind speed. The relationships between the average U-value and those of the roof, sides, and front and rear of the experimental greenhouse were modeled, and were shown to have a highly linear relationship.

Suggested Citation

  • Hyung-Kweon Kim & Young-Sun Ryou & Young-Hwa Kim & Tae-Seok Lee & Sung-Sik Oh & Yong-Hyeon Kim, 2021. "Estimating the Thermal Properties of the Cover and the Floor in a Plastic Greenhouse," Energies, MDPI, vol. 14(7), pages 1-11, April.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:7:p:1970-:d:529348
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    References listed on IDEAS

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    1. Fokaides, Paris A. & Kalogirou, Soteris A., 2011. "Application of infrared thermography for the determination of the overall heat transfer coefficient (U-Value) in building envelopes," Applied Energy, Elsevier, vol. 88(12), pages 4358-4365.
    2. Xu, J. & Li, Y. & Wang, R.Z. & Liu, W., 2014. "Performance investigation of a solar heating system with underground seasonal energy storage for greenhouse application," Energy, Elsevier, vol. 67(C), pages 63-73.
    3. Hyung-Kweon Kim & Geum-Choon Kang & Jong-Pil Moon & Tae-Seok Lee & Sung-Sik Oh, 2018. "Estimation of Thermal Performance and Heat Loss in Plastic Greenhouses with and without Thermal Curtains," Energies, MDPI, vol. 11(3), pages 1-11, March.
    4. Yang, Seung-Hwan & Rhee, Joong Yong, 2013. "Utilization and performance evaluation of a surplus air heat pump system for greenhouse cooling and heating," Applied Energy, Elsevier, vol. 105(C), pages 244-251.
    5. Bouadila, Salwa & Kooli, Sami & Skouri, Safa & Lazaar, Mariem & Farhat, Abdelhamid, 2014. "Improvement of the greenhouse climate using a solar air heater with latent storage energy," Energy, Elsevier, vol. 64(C), pages 663-672.
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    Cited by:

    1. Chiara Bersani & Marco Fossa & Antonella Priarone & Roberto Sacile & Enrico Zero, 2021. "Model Predictive Control versus Traditional Relay Control in a High Energy Efficiency Greenhouse," Energies, MDPI, vol. 14(11), pages 1-21, June.

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