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Intelligent greenhouse design decreases water use for evaporative cooling in arid regions

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  • Tsafaras, I.
  • Campen, J.B.
  • Stanghellini, C.
  • de Zwart, H.F.
  • Voogt, W.
  • Scheffers, K.
  • Harbi, A. Al
  • Assaf, K. Al

Abstract

Production of vegetables for fresh consumption in arid regions usually takes place in greenhouses with evaporative cooling during the warm months of the year. In this period, water use for cooling easily exceeds irrigation water use. The purpose of this paper is to investigate how far water use for evaporative cooling can be lowered by adapting design elements of the greenhouse and the evaporative cooling system. In a greenhouse trial in a desert environment, in Riyadh (KSA), two different greenhouses: one traditional and one modified, both equipped with a pad and fan system, have been compared in terms of productivity and water use with main focus on water use for cooling. The modified greenhouse design resulted in about 14% higher fresh weight production and more than 40% water saving was achieved on evaporative cooling. The climate and water use data recorded during the trial were used to validate a greenhouse climate simulation model including pad and fan cooling. Then, we used the validated model in a scenario study and we quantified the effect of each one of three design elements on use of cooling water. It was shown that the extracted air temperature has a major influence on water use for cooling. Increasing the extracted air temperature with 4 K resulted in about 27% saving in water use for cooling. The latter was done by repositioning of the exhaust fans in order to take advantage of the vertical air temperature gradient in the greenhouse. Additionally, a 5% higher cooling efficiency of the pad wall could yield an extra 12% water saving for evaporative cooling. Finally, the greenhouse cover-to-ground area ratio was also found to affect the water use for cooling. In summary, we have shown that there is much scope for saving on water use for evaporative cooling by improving design of greenhouses and of the cooling system, and that a good greenhouse climate model can be a useful tool in this process. The findings of the current research provide clear guidelines for the construction of more water efficient evaporatively cooled greenhouses.

Suggested Citation

  • Tsafaras, I. & Campen, J.B. & Stanghellini, C. & de Zwart, H.F. & Voogt, W. & Scheffers, K. & Harbi, A. Al & Assaf, K. Al, 2021. "Intelligent greenhouse design decreases water use for evaporative cooling in arid regions," Agricultural Water Management, Elsevier, vol. 250(C).
    • Handle: RePEc:eee:agiwat:v:250:y:2021:i:c:s037837742100072x
    DOI: 10.1016/j.agwat.2021.106807
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    References listed on IDEAS

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    1. Antonio Franco & Diego L. Valera & Araceli Peña, 2014. "Energy Efficiency in Greenhouse Evaporative Cooling Techniques: Cooling Boxes versus Cellulose Pads," Energies, MDPI, vol. 7(3), pages 1-21, March.
    2. Katsoulas, N. & Sapounas, A. & De Zwart, F. & Dieleman, J.A. & Stanghellini, C., 2015. "Reducing ventilation requirements in semi-closed greenhouses increases water use efficiency," Agricultural Water Management, Elsevier, vol. 156(C), pages 90-99.
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    1. Araceli Peña-Fernández & Manuel A. Colón-Reynoso & Pilar Mazuela, 2024. "Geometric Analysis of Greenhouse Roofs for Energy Efficiency Optimization and Condensation Drip Reduction," Agriculture, MDPI, vol. 14(2), pages 1-17, January.
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    3. Hegazy, Anwar & Farid, Mohammed & Subiantoro, Alison & Norris, Stuart, 2022. "Sustainable cooling strategies to minimize water consumption in a greenhouse in a hot arid region," Agricultural Water Management, Elsevier, vol. 274(C).

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