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Refrigeration Capacity and Effect of Ageing on the Operation of Cellulose Evaporative Cooling Pads, by Wind Tunnel Analysis

Author

Listed:
  • Antonio Franco-Salas

    (ETSIA, University of Sevilla, Ctra. de Utrera km, 1, 41013 Sevilla, Spain)

  • Araceli Peña-Fernández

    (CIAIMBITAL Research Centre, University of Almería, Ctra. de Sacramento s/n, 04120 Almería, Spain)

  • Diego Luis Valera-Martínez

    (CIAIMBITAL Research Centre, University of Almería, Ctra. de Sacramento s/n, 04120 Almería, Spain)

Abstract

This study investigates the temperature reduction capacity and water consumption of a fan-pad system installed in a greenhouse located in the coastal regions of Almería. The suitability of this system for coastal zones with high environmental humidity during the summer is analyzed. Historical temperature and relative humidity series are studied, obtaining the thermal difference and maximum, medium, and minimum monthly water consumption of the pads based on the operation data of the pads. Despite the high relative humidity of the air in the hottest hours of the day, a decrease of 5.92 °C in the mean temperature and a water consumption of 13.55 l/h per square meter of an evaporative cooling pad are obtained in the month of August. Additionally, the operation of a cellulose evaporative cooling pad installed for 3 years in a greenhouse is analyzed in a wind tunnel and compared with that of a new pad of the same model. Over time and with low maintenance, the porosity of the pad decreases due to salt incrustation. The salt incrustation makes airflow more difficult in the pad, increasing the pressure drop by 170.04%; however, the air saturation efficiency of the pad increases by 6.6% due to the greater contact time between the air and the water.

Suggested Citation

  • Antonio Franco-Salas & Araceli Peña-Fernández & Diego Luis Valera-Martínez, 2019. "Refrigeration Capacity and Effect of Ageing on the Operation of Cellulose Evaporative Cooling Pads, by Wind Tunnel Analysis," IJERPH, MDPI, vol. 16(23), pages 1-11, November.
    • Handle: RePEc:gam:jijerp:v:16:y:2019:i:23:p:4690-:d:290616
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    References listed on IDEAS

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    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. Daou, K. & Wang, R.Z. & Xia, Z.Z., 2006. "Desiccant cooling air conditioning: a review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 10(2), pages 55-77, April.
    3. Lychnos, G. & Davies, P.A., 2012. "Modelling and experimental verification of a solar-powered liquid desiccant cooling system for greenhouse food production in hot climates," Energy, Elsevier, vol. 40(1), pages 116-130.
    4. 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.
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