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Analysis of Heat and Mass Distribution in a Single- and Multi-Span Greenhouse Microclimate

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  • Qazeem Opeyemi Ogunlowo

    (Department of Agricultural Civil Engineering, College of Agricultural and Life Sciences, Kyungpook National University, Daegu 702-701, Korea
    Department of Agricultural and Bioenvironmental Engineering, Federal College of Agriculture Ibadan, Ibadan PMB 5029, Nigeria)

  • Timothy Denen Akpenpuun

    (Smart Agriculture Innovation Center, Kyungpook National University, Daegu 41566, Korea
    Department of Agricultural and Biosystems Engineering, University of Ilorin, Ilorin PMB 1515, Nigeria)

  • Wook-Ho Na

    (Smart Agriculture Innovation Center, Kyungpook National University, Daegu 41566, Korea)

  • Anis Rabiu

    (Department of Agricultural Civil Engineering, College of Agricultural and Life Sciences, Kyungpook National University, Daegu 702-701, Korea)

  • Misbaudeen Aderemi Adesanya

    (Department of Agricultural Civil Engineering, College of Agricultural and Life Sciences, Kyungpook National University, Daegu 702-701, Korea)

  • Kwame Sasu Addae

    (Department of Agricultural Civil Engineering, College of Agricultural and Life Sciences, Kyungpook National University, Daegu 702-701, Korea)

  • Hyeon-Tae Kim

    (Department of Bio-Industrial Machinery Engineering, Gyeongsang National University, Jinju 52828, Korea)

  • Hyun-Woo Lee

    (Department of Agricultural Civil Engineering, College of Agricultural and Life Sciences, Kyungpook National University, Daegu 702-701, Korea
    Smart Agriculture Innovation Center, Kyungpook National University, Daegu 41566, Korea)

Abstract

Recently, heat and mass distributions within a greenhouse were assumed to be homogeneous. Heat is gained or lost in absolute terms, and crop contribution in a greenhouse or its effect is not considered. In this study, statistical analyses were conducted to establish the significance of heat and mass variation at sensor nodes in two single-span and multi-span greenhouses. Three greenhouses were used in this study, 168 m 2 floor area a single-layered (SLG), double-layered (DLG) single-span gothic roof type greenhouses, and 7572.6 m 2 floor area multi-span greenhouse (MSG). The microclimatic parameters investigated were temperature (T), relative humidity (RH), solar radiation (SR), carbon dioxide (CO 2 ), and vapor pressure deficit (VPD). To check their horizontal distribution, all microclimate data collected from each sensor node in each greenhouse were subjected to descriptive statistics and Tukey honestly significant difference (HSD) test. The lowest minimum temperatures of 2.93 °C, 3.33 °C and 10.50 °C were recorded at sensor points in SLG, DLG, and MSG, respectively, whereas the highest maximum temperatures of 29.17 °C, 29.07 °C and 27.20 °C were recorded at sensor point, in SLG, DLG, and MSG, respectively. The difference between the center and the side into the single-span was approximately 0.88–1.0 °C and in the MSG was approximately 1.03 °C. Significant variation was observed in the horizontal distribution of T, RH, SR, and VPD within SLG, DLG, and MSG. Also significant was CO 2 in the MSG. Estimating the energy demand of greenhouses should be done based on the distribution rather than assuming microclimatic parameters homogeneity, especially for T, with VPD as a control parameter. Such estimation should also be done using a crop model that considers instant changes in air and crop temperature.

Suggested Citation

  • Qazeem Opeyemi Ogunlowo & Timothy Denen Akpenpuun & Wook-Ho Na & Anis Rabiu & Misbaudeen Aderemi Adesanya & Kwame Sasu Addae & Hyeon-Tae Kim & Hyun-Woo Lee, 2021. "Analysis of Heat and Mass Distribution in a Single- and Multi-Span Greenhouse Microclimate," Agriculture, MDPI, vol. 11(9), pages 1-24, September.
    • Handle: RePEc:gam:jagris:v:11:y:2021:i:9:p:891-:d:636879
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    References listed on IDEAS

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    1. Adnan Rasheed & Wook Ho Na & Jong Won Lee & Hyeon Tae Kim & Hyun Woo Lee, 2019. "Optimization of Greenhouse Thermal Screens for Maximized Energy Conservation," Energies, MDPI, vol. 12(19), pages 1-20, September.
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    Cited by:

    1. Misbaudeen Aderemi Adesanya & Wook-Ho Na & Anis Rabiu & Qazeem Opeyemi Ogunlowo & Timothy Denen Akpenpuun & Adnan Rasheed & Yong-Cheol Yoon & Hyun-Woo Lee, 2022. "TRNSYS Simulation and Experimental Validation of Internal Temperature and Heating Demand in a Glass Greenhouse," Sustainability, MDPI, vol. 14(14), pages 1-30, July.

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