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Energy, exergy, exergo-economic and exergo-environmental analysis of waste heat-based convective dryer

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  • Masud, Mahadi Hasan
  • Himel, Md. Hasibul Hasan
  • Ahmed, Mim Mashrur
  • Chowdhury, Sami Ahbab
  • Dabnichki, Peter

Abstract

Food drying is a widely used method of food preservation worldwide, and the utilization of waste heat from exhaust flue gas presents a significant opportunity to reduce the energy consumption of industrial drying processes. This study thoroughly examines the energy and exergy efficiency, sustainability indicators, and various exergo-environmental and exergo-economic parameters to assess the performance of a waste heat-based convective dryer (WHCD). The study found that drying at 70 °C performed the best (among 50 °C, 60 °C and 70 °C) for the overall drying process, with a maximum overall exergetic efficiency of 4.89 %. The results of exergo-economic analysis revealed that the drying chamber exhibited the highest exergy destruction cost at US$0.01193 per hour, and it was determined that improving the drying chamber was of paramount importance. An exergo-environmental assessment indicates that the proposed dryer effectively mitigates 14.15 tons of CO2 over a 20-year lifespan. Sensitivity analysis of the proposed system reveals that the energy efficiency is more sensitive to the food drying temperature than the exergy efficiency. A 33 % increase in drying temperature increases the exergy efficiency by 19.37 % while reducing the energy efficiency by 37.54 %. Hence, adopting the proposed system in industrial settings could significantly enhance energy-efficient and sustainable food drying processes.

Suggested Citation

  • Masud, Mahadi Hasan & Himel, Md. Hasibul Hasan & Ahmed, Mim Mashrur & Chowdhury, Sami Ahbab & Dabnichki, Peter, 2024. "Energy, exergy, exergo-economic and exergo-environmental analysis of waste heat-based convective dryer," Energy, Elsevier, vol. 312(C).
    • Handle: RePEc:eee:energy:v:312:y:2024:i:c:s0360544224034108
    DOI: 10.1016/j.energy.2024.133632
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    References listed on IDEAS

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