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<p>In rural agricultural communities, the lack of affordable refrigeration leads to considerable post-harvest losses of perishable crops, adversely affecting farmers’ livelihoods. This study investigates a modified pot-in-pot evaporative cooling system incorporating alternative porous media sand-water, stone-water, and sponge-water mixtures as sustainable and energy-free cooling materials. Unlike conventional sand-based coolers, this design explores material-driven thermal and hydraulic optimization to enhance temperature regulation and humidity retention. The system was tested with 500&#xa0;g of tomatoes over 24&#xa0;h, with temperature and humidity monitored every minute using DHT22 sensors connected to an Arduino Uno. Based on time-averaged readings, the system achieved temperature reductions between 2.4&#xa0;°C and 6.0&#xa0;°C from an ambient average of 24.38&#xa0;°C, and internal humidity between 75% and 90%. The findings highlight the novel integration of low-cost, locally available materials to improve passive cooling efficiency, offering an accessible approach to reduce post-harvest losses and enhance food security in resource-limited rural settings. Results, based on time-averaged readings from a pilot 24-h trial, indicate ΔT of 2.4–6.0&#xa0;°C. These exploratory findings motivate replicated testing specified in the Methods.</p>

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Sustainable development of passive pot in pot cooling systems using locally available packing materials

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月29日

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  • C. S. Thamme Gowda,
  • G. B. Krishnappa,
  • M. Monisha,
  • H. K. Sachidananda

摘要

In rural agricultural communities, the lack of affordable refrigeration leads to considerable post-harvest losses of perishable crops, adversely affecting farmers’ livelihoods. This study investigates a modified pot-in-pot evaporative cooling system incorporating alternative porous media sand-water, stone-water, and sponge-water mixtures as sustainable and energy-free cooling materials. Unlike conventional sand-based coolers, this design explores material-driven thermal and hydraulic optimization to enhance temperature regulation and humidity retention. The system was tested with 500 g of tomatoes over 24 h, with temperature and humidity monitored every minute using DHT22 sensors connected to an Arduino Uno. Based on time-averaged readings, the system achieved temperature reductions between 2.4 °C and 6.0 °C from an ambient average of 24.38 °C, and internal humidity between 75% and 90%. The findings highlight the novel integration of low-cost, locally available materials to improve passive cooling efficiency, offering an accessible approach to reduce post-harvest losses and enhance food security in resource-limited rural settings. Results, based on time-averaged readings from a pilot 24-h trial, indicate ΔT of 2.4–6.0 °C. These exploratory findings motivate replicated testing specified in the Methods.