Abstract
Drying of fish at the Sagar Island (21.7269° N, 88.1096° E) is generally carried out in open sun on the seashore on plastic sheets or mat of palm leaves. This is not an environment-friendly and healthy practice. To alleviate the limitations of open sun drying, 600 kg (300 kg × 2) walk-in solar thermal dryer was installed at a fishing cooperative. The dryer consequently augmented the income of the fisher folk by enhancing throughput and refining the quality of dried fish. The design incorporated, (a) 80% UV cut-off film to take care of appearance of the dried fish; (b) facilitating proper air flow pattern for uniform both side drying; (c) completely dismantlable system to take care of incoming storms/cyclones in advance; (d) solar photovoltaic powered dehumidifiers to control the relative humidity at night and achieve a dried batch in less than 24 h. The fabricated solar thermal dryer had drying temperature in the range of 36.9–53.1 °C throughout the day. Due to the use of the dehumidifiers, an entire batch of fish could be dried from an initial 80% to final 10% moisture content (wet basis) in less than 24 h compared to 38 h in open sun drying. The solar thermal drying efficiency was 30.24% and specific energy consumption was found to be 2.35 kg/kWh. The embodied energy was 10,756 kWh and CO2 emission was calculated to be 422 kg per year, which was lower than other fossil-driven drying systems.
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Acknowledgements
This work has been supported financially by the Adopt Biotechnology for Community Development (ABCD) 2017-2018 of the Department of Biotechnology, Government of West Bengal, India. The work has also been supported in part by CSIR India as part of an in-house laboratory project. The authors thank Diamond Engineering Enterprises for the installation of the solar thermal dryers according to design. This is CSIR-CSMCRI 036/2019.
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Andharia, J.K., Haldar, S., Samaddar, S. et al. Case study of augmenting livelihood of fishing community at Sagar Island, India, through solar thermal dryer technology. Environ Dev Sustain 24, 11449–11469 (2022). https://doi.org/10.1007/s10668-021-01895-y
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DOI: https://doi.org/10.1007/s10668-021-01895-y