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<p>As the global water crisis intensifies due to climate change, pollution, and overconsumption, the need of innovative, sustainable, and decentralized water solutions becomes crucial. Atmospheric water harvesting offers a viable approach to combat water scarcity in every corner of the earth. A new solar driven atmospheric water harvesting system (SD-AWHs) is proposed to address the challenge of water scarcity and sustainability. The system uses double ended open evacuated tube solar collector to generate hot air for desiccant wheel regeneration, desiccant wheel to transfer moisture from ambient air to process air, and ambient air cooled condenser to condense the water vapor. Initially, year-round weather data is assessed for four Indian cities having diverse climatic conditions. To evaluate the air heating capability of evacuated tube collector in these cities, the ANSYS transient K-Epsilon model is used. Further, a mathematical model of the desiccant wheel is developed to analyse the performance of desiccant wheel as per the assessed ambient conditions and obtained regeneration temperature. Due to the arid climate of Jaipur with higher ambient dry bulb temperature (DBT) the water productivity of the system remains negligible over the year. Whereas, Silchar’s hot and humid conditions enable the system to achieve water yield up to 3.4&#xa0;L/h. Srinagar, despite its dry climate, benefits from a comparatively lower DBT, resulting in a significant water productivity of 1.92&#xa0;L/h. As the Surat city holds high humidity in ambient air throughout the year, it achieved 16.96&#xa0;L of daily water productivity along with 25.72% thermal efficiency.</p>

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Numerical investigation of solar driven atmospheric water harvesting system based on desiccant wheel under diverse climatic conditions in India

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Pravesh Kumar Kushwaha,
  • Amit Kumar,
  • Kuldeep Chaudhari

摘要

As the global water crisis intensifies due to climate change, pollution, and overconsumption, the need of innovative, sustainable, and decentralized water solutions becomes crucial. Atmospheric water harvesting offers a viable approach to combat water scarcity in every corner of the earth. A new solar driven atmospheric water harvesting system (SD-AWHs) is proposed to address the challenge of water scarcity and sustainability. The system uses double ended open evacuated tube solar collector to generate hot air for desiccant wheel regeneration, desiccant wheel to transfer moisture from ambient air to process air, and ambient air cooled condenser to condense the water vapor. Initially, year-round weather data is assessed for four Indian cities having diverse climatic conditions. To evaluate the air heating capability of evacuated tube collector in these cities, the ANSYS transient K-Epsilon model is used. Further, a mathematical model of the desiccant wheel is developed to analyse the performance of desiccant wheel as per the assessed ambient conditions and obtained regeneration temperature. Due to the arid climate of Jaipur with higher ambient dry bulb temperature (DBT) the water productivity of the system remains negligible over the year. Whereas, Silchar’s hot and humid conditions enable the system to achieve water yield up to 3.4 L/h. Srinagar, despite its dry climate, benefits from a comparatively lower DBT, resulting in a significant water productivity of 1.92 L/h. As the Surat city holds high humidity in ambient air throughout the year, it achieved 16.96 L of daily water productivity along with 25.72% thermal efficiency.