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

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Title: Dynamic Evaluation of Desiccant Dehumidification Evaporative Cooling Options for Greenhouse Air-Conditioning Application in Multan (Pakistan).
Authors: Ashraf, Hadeed1 (AUTHOR) hadeedashraf15@gmail.com, Sultan, Muhammad1 (AUTHOR) farukh_56@hotmail.com, Shamshiri, Redmond R.2 (AUTHOR) muhammadsultan@bzu.edu.pk, Abbas, Farrukh1 (AUTHOR) hamidmahmood@bzu.edu.pk, Farooq, Muhammad3 (AUTHOR) engr.farooq@uet.edu.pk, Sajjad, Uzair4 (AUTHOR) energyengineer01@gmail.com, Md-Tahir, Hafiz5 (AUTHOR) m.tahir@webmail.hzau.edu.cn, Mahmood, Muhammad H.1 (AUTHOR) fiazahmad@bzu.edu.pk, Ahmad, Fiaz1 (AUTHOR), Taseer, Yousaf R.6 (AUTHOR) engr.yousafraza@bzu.edu.pk, Shahzad, Aamir7 (AUTHOR) ofwm_khb@yahoo.com, Niazi, Badar M. K.8 (AUTHOR) badar.khan.niazi@gmail.com, Danielewicz, Jan (AUTHOR), Rajski, Krzysztof (AUTHOR)
Source: Energies (19961073). 2/15/2021, Vol. 14 Issue 4, p1097-1097. 1p.
Subject Terms: *Humidity control, *Greenhouses, *Evaporative cooling, *Drying agents, *Air conditioning, *Heat exchangers, *Greenhouse plants
Geographic Terms: Pakistan, Multan (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). [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 149045190
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PubTypeId: academicJournal
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Dynamic Evaluation of Desiccant Dehumidification Evaporative Cooling Options for Greenhouse Air-Conditioning Application in Multan (Pakistan).
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Ashraf%2C+Hadeed%22">Ashraf, Hadeed</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> hadeedashraf15@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Sultan%2C+Muhammad%22">Sultan, Muhammad</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> farukh_56@hotmail.com</i><br /><searchLink fieldCode="AR" term="%22Shamshiri%2C+Redmond+R%2E%22">Shamshiri, Redmond R.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> muhammadsultan@bzu.edu.pk</i><br /><searchLink fieldCode="AR" term="%22Abbas%2C+Farrukh%22">Abbas, Farrukh</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> hamidmahmood@bzu.edu.pk</i><br /><searchLink fieldCode="AR" term="%22Farooq%2C+Muhammad%22">Farooq, Muhammad</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> engr.farooq@uet.edu.pk</i><br /><searchLink fieldCode="AR" term="%22Sajjad%2C+Uzair%22">Sajjad, Uzair</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> energyengineer01@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Md-Tahir%2C+Hafiz%22">Md-Tahir, Hafiz</searchLink><relatesTo>5</relatesTo> (AUTHOR)<i> m.tahir@webmail.hzau.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Mahmood%2C+Muhammad+H%2E%22">Mahmood, Muhammad H.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> fiazahmad@bzu.edu.pk</i><br /><searchLink fieldCode="AR" term="%22Ahmad%2C+Fiaz%22">Ahmad, Fiaz</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Taseer%2C+Yousaf+R%2E%22">Taseer, Yousaf R.</searchLink><relatesTo>6</relatesTo> (AUTHOR)<i> engr.yousafraza@bzu.edu.pk</i><br /><searchLink fieldCode="AR" term="%22Shahzad%2C+Aamir%22">Shahzad, Aamir</searchLink><relatesTo>7</relatesTo> (AUTHOR)<i> ofwm_khb@yahoo.com</i><br /><searchLink fieldCode="AR" term="%22Niazi%2C+Badar+M%2E+K%2E%22">Niazi, Badar M. K.</searchLink><relatesTo>8</relatesTo> (AUTHOR)<i> badar.khan.niazi@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Danielewicz%2C+Jan%22">Danielewicz, Jan</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rajski%2C+Krzysztof%22">Rajski, Krzysztof</searchLink> (AUTHOR)
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. 2/15/2021, Vol. 14 Issue 4, p1097-1097. 1p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Humidity+control%22">Humidity control</searchLink><br />*<searchLink fieldCode="DE" term="%22Greenhouses%22">Greenhouses</searchLink><br />*<searchLink fieldCode="DE" term="%22Evaporative+cooling%22">Evaporative cooling</searchLink><br />*<searchLink fieldCode="DE" term="%22Drying+agents%22">Drying agents</searchLink><br />*<searchLink fieldCode="DE" term="%22Air+conditioning%22">Air conditioning</searchLink><br />*<searchLink fieldCode="DE" term="%22Heat+exchangers%22">Heat exchangers</searchLink><br />*<searchLink fieldCode="DE" term="%22Greenhouse+plants%22">Greenhouse plants</searchLink>
– Name: SubjectGeographic
  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Pakistan%22">Pakistan</searchLink><br /><searchLink fieldCode="DE" term="%22Multan+%28Pakistan%29%22">Multan (Pakistan)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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). [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.3390/en14041097
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: 1097
    Subjects:
      – SubjectFull: Humidity control
        Type: general
      – SubjectFull: Greenhouses
        Type: general
      – SubjectFull: Evaporative cooling
        Type: general
      – SubjectFull: Drying agents
        Type: general
      – SubjectFull: Air conditioning
        Type: general
      – SubjectFull: Heat exchangers
        Type: general
      – SubjectFull: Greenhouse plants
        Type: general
      – SubjectFull: Pakistan
        Type: general
      – SubjectFull: Multan (Pakistan)
        Type: general
    Titles:
      – TitleFull: Dynamic Evaluation of Desiccant Dehumidification Evaporative Cooling Options for Greenhouse Air-Conditioning Application in Multan (Pakistan).
        Type: main
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              M: 02
              Text: 2/15/2021
              Type: published
              Y: 2021
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