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Energy efficiency improvements in longan drying practice

Author

Listed:
  • Tippayawong, N.
  • Tantakitti, C.
  • Thavornun, S.

Abstract

This paper presents and evaluates methods of improvement of energy utilization and reduction of energy cost in conventional unpeeled longan drying. Existing dryers were modified into a new dryer arrangement. Performance in terms of specific energy utilization, thermal efficiency and operating cost indices for both traditional and new designs was evaluated. Results showed that the modified dryer yielded an average thermal efficiency of 0.35, compared to 0.29 for the existing dryer. For the same mass of dried longan produced, specific energy utilization and fuel cost were reduced by more than 16% and 80%, respectively. The improvement was attributed to fuel switching from liquefied petroleum gas to wood, heat recovery via hot air recirculation, better temperature and humidity control, and thermal insulation. The new dryer with improved design and better energy efficiency was estimated to have payback period less than 3 years.

Suggested Citation

  • Tippayawong, N. & Tantakitti, C. & Thavornun, S., 2008. "Energy efficiency improvements in longan drying practice," Energy, Elsevier, vol. 33(7), pages 1137-1143.
    • Handle: RePEc:eee:energy:v:33:y:2008:i:7:p:1137-1143
    DOI: 10.1016/j.energy.2008.02.007
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    Citations

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    Cited by:

    1. Walmsley, Timothy G. & Walmsley, Michael R.W. & Atkins, Martin J. & Neale, James R. & Tarighaleslami, Amir H., 2015. "Thermo-economic optimisation of industrial milk spray dryer exhaust to inlet air heat recovery," Energy, Elsevier, vol. 90(P1), pages 95-104.
    2. Angelo Del Giudice & Andrea Acampora & Enrico Santangelo & Luigi Pari & Simone Bergonzoli & Ettore Guerriero & Francesco Petracchini & Marco Torre & Valerio Paolini & Francesco Gallucci, 2019. "Wood Chip Drying through the Using of a Mobile Rotary Dryer," Energies, MDPI, vol. 12(9), pages 1-16, April.
    3. Dejchanchaiwong, Racha & Kumar, Anil & Tekasakul, Perapong, 2019. "Performance and economic analysis of natural convection based rubber smoking room for rubber cooperatives in Thailand," Renewable Energy, Elsevier, vol. 132(C), pages 233-242.
    4. Yotsaphat Kittichotsatsawat & Varattaya Jangkrajarng & Korrakot Yaibuathet Tippayawong, 2021. "Enhancing Coffee Supply Chain towards Sustainable Growth with Big Data and Modern Agricultural Technologies," Sustainability, MDPI, vol. 13(8), pages 1-20, April.
    5. Singh, Shobhana & Kumar, Subodh, 2013. "Solar drying for different test conditions: Proposed framework for estimation of specific energy consumption and CO2 emissions mitigation," Energy, Elsevier, vol. 51(C), pages 27-36.
    6. Darvishi, Hosain & Azadbakht, Mohsen & Noralahi, Bashir, 2018. "Experimental performance of mushroom fluidized-bed drying: Effect of osmotic pretreatment and air recirculation," Renewable Energy, Elsevier, vol. 120(C), pages 201-208.
    7. Motevali, Ali & Minaei, Saeid & Khoshtaghaza, Mohammad Hadi & Amirnejat, Hamed, 2011. "Comparison of energy consumption and specific energy requirements of different methods for drying mushroom slices," Energy, Elsevier, vol. 36(11), pages 6433-6441.
    8. Cheng-Han Li & Yu-Ting Hsu & Chun-Hung Hsieh & Ching-Wei Cheng, 2021. "A Novel Semiautomatic Flesh Peeling and Seed Removing Mechanism for Dried Longan," Agriculture, MDPI, vol. 11(1), pages 1-11, January.

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