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Dynamic Evaluation of Desiccant Dehumidification Evaporative Cooling Options for Greenhouse Air-Conditioning Application in Multan (Pakistan)

Author

Listed:
  • Hadeed Ashraf

    (Department of Agricultural Engineering, Bahauddin Zakariya University, Bosan Road, Multan 60800, Pakistan
    These authors contributed equally to this work.)

  • Muhammad Sultan

    (Department of Agricultural Engineering, Bahauddin Zakariya University, Bosan Road, Multan 60800, Pakistan
    These authors contributed equally to this work.)

  • Redmond R. Shamshiri

    (Department of Engineering for Crop Production, Leibniz Institute for Agricultural Engineering and Bioeconomy, 14469 Potsdam-Bornim, Germany
    These authors contributed equally to this work.)

  • Farrukh Abbas

    (Department of Agricultural Engineering, Bahauddin Zakariya University, Bosan Road, Multan 60800, Pakistan
    These authors contributed equally to this work.)

  • Muhammad Farooq

    (Department of Mechanical Engineering, University of Engineering and Technology, Lahore 39161, Pakistan)

  • Uzair Sajjad

    (Mechanical Engineering Department, National Chiao Tung University, Hsinchu 30010, Taiwan)

  • Hafiz Md-Tahir

    (College of Engineering, Huazhong Agricultural University, Wuhan 430070, China)

  • Muhammad H. Mahmood

    (Department of Agricultural Engineering, Bahauddin Zakariya University, Bosan Road, Multan 60800, Pakistan)

  • Fiaz Ahmad

    (Department of Agricultural Engineering, Bahauddin Zakariya University, Bosan Road, Multan 60800, Pakistan)

  • Yousaf R. Taseer

    (Department of Building and Architectural Engineering, Bahauddin Zakariya University, Bosan Road, Multan 60800, Pakistan)

  • Aamir Shahzad

    (Office of the Deputy Director Agriculture (Water Management), Punjab Agriculture Department, Officers Colony, Muzaffargarh Road, Jauharabad, Khushab 41000, Pakistan)

  • Badar M. K. Niazi

    (Agricultural Engineering Institute, National Agricultural Research Centre, Park Road, Islamabad 44000, Pakistan)

Abstract

This study provides insights into the feasibility of a desiccant dehumidification-based Maisotsenko cycle evaporative cooling (M-DAC) system for greenhouse air-conditioning application. Conventional cooling techniques include direct evaporative cooling, refrigeration systems, and passive/active ventilation. which are commonly used in Pakistan; however, they are either not feasible due to their energy cost, or they cannot efficiently provide an optimum microclimate depending on the regions, the growing seasons, and the crop being cultivated. The M-DAC system was therefore proposed and evaluated as an alternative solution for air conditioning to achieve optimum levels of vapor pressure deficit (VPD) for greenhouse crop production. The objective of this study was to investigate the thermodynamic performance of the proposed system from the viewpoints of the temperature gradient, relative humidity level, VPD, and dehumidification gradient. Results showed that the standalone desiccant air-conditioning (DAC) system created maximum dehumidification gradient (i.e., 16.8 g/kg) and maximum temperature gradient (i.e., 8.4 °C) at 24.3 g/kg and 38.6 °C ambient air conditions, respectively. The DAC coupled with a heat exchanger (DAC+HX) created a temperature gradient nearly equal to ambient air conditions, which is not in the optimal range for greenhouse growing conditions. Analysis of the M-DAC system showed that a maximum air temperature gradient, i.e., 21.9 °C at 39.2 °C ambient air condition, can be achieved, and is considered optimal for most greenhouse crops. Results were validated with two microclimate models (OptDeg and Cft) by taking into account the optimality of VPD at different growth stages of tomato plants. This study suggests that the M-DAC system is a feasible method to be considered as an efficient solution for greenhouse air-conditioning under the climate conditions of Multan (Pakistan).

Suggested Citation

  • Hadeed Ashraf & Muhammad Sultan & Redmond R. Shamshiri & Farrukh Abbas & Muhammad Farooq & Uzair Sajjad & Hafiz Md-Tahir & Muhammad H. Mahmood & Fiaz Ahmad & Yousaf R. Taseer & Aamir Shahzad & Badar M, 2021. "Dynamic Evaluation of Desiccant Dehumidification Evaporative Cooling Options for Greenhouse Air-Conditioning Application in Multan (Pakistan)," Energies, MDPI, vol. 14(4), pages 1-21, February.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:4:p:1097-:d:502228
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    References listed on IDEAS

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    11. Rabia Kanwal & Hadeed Ashraf & Muhammad Sultan & Irrum Babu & Zarina Yasmin & Muhammad Nadeem & Muhammad Asghar & Redmond R. Shamshiri & Sobhy M. Ibrahim & Nisar Ahmad & Muhammad A. Imran & Yuguang Zh, 2020. "Effect of 1-Methyl Cyclopropane and Modified Atmosphere Packaging on the Storage of Okra ( Abelmoschus esculentus L. ): Theory and Experiments," Sustainability, MDPI, vol. 12(18), pages 1-22, September.
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    Cited by:

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    3. Muhammad N. Ashraf & Muhammad H. Mahmood & Muhammad Sultan & Redmond R. Shamshiri & Sobhy M. Ibrahim, 2021. "Investigation of Energy Consumption and Associated CO 2 Emissions for Wheat–Rice Crop Rotation Farming," Energies, MDPI, vol. 14(16), pages 1-18, August.
    4. Xiao, Xin & Liu, Jinjin, 2024. "A state-of-art review of dew point evaporative cooling technology and integrated applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 191(C).

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