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An attempt was made to develop low cost porous evaporative cooling storage structures for extending the shelf life of citrus fruits and vegetables at the Sylhet Agricultural University campus, Bangladesh. Clay soil, bamboo and straw were used as a wall material. Sand, clay, zeolite, rice husk and charcoal etc. were used as a pad material. But the mixture of sand and clay was found as the most efficient pad materials for lowering temperature. Porous evaporative cooling storage structure (PECSS) was developed to reduce the problems of post-harvest losses at farmer level. It is eco-friendly and no energy requirements for storage of vegetables and fruits. PECSS improves the quality and productivity of vegetables and citrus fruits by reducing temperature, prolonging shelf life and reducing post-harvest losses respectively. The study revealed that shelf life of egg-plant (Solanum melongena) was 11 days in PECSS condition and it was 6 days in ambient condition. Therefore, weight loss was 4.07% for PECSS and 11.84% in room condition respectively. Storage life of Ladies finger (Abelmoschus esculentus) was 6 days more in PECSS condition than room condition. Weight loss was 6.62% in PECSS condition and 17.47% loss in ambient condition. In case of Malabar Spinach (Basella alba) it was 6 days for PECSS condition and 3 days for room condition and weight loss was found to be 9.48% and 16.17% respectively. The shelf life of stem amaranth (Amaranthus cruentus) was 5 days in PECSS condition and 2 days in ambient condition. Weight loss was found 7.05% at PECSS condition and 28.62% as in-room condition. By chemical analysis for fruits lemon (Citrus limon) and orange (Citrus sinensis) found that pH and TSS were increased both ambient and PECSS condition but in PECSS condition this rate was less than ambient condition. Vitamin C, percentage juice content, citric acid values all were decrease at both condition but in PECSS condition its rate was the less ambient condition. There is scope for intensive study to improve the firmness of the porous evaporative cooling storage structure (PECSS) to reduce the storage loss of vegetables and citrus fruits for different region and its suitability for large scale design.
Liberty JT, Okonkwo WI, Echiegu EA. Evaporative cooling: A postharvest technology for fruits and vegetables preservation. International Journal of Scientific & Engineering Research. 2013;4(8):2257-2266.
FAO. General post harvest handling practices in Southern Nigeria; A manual for sustainable agriculture. Food and Agricultural Organization. Rome; 2003.
Bastrash DM. Properties of fruits and vegetables. A Manual for Horticulture Crops, 3rd Edition Series No. 8; 1998.
Ajayi OT. Modification and testing of an evaporative cooling facility, for storing vegetables. Department of Agricultural Engineering College of Engineering University of Agriculture Abeokuta, Ogun State. (Unpublished Project); 2011.
Fabiyi AO. Designing, construction and testing of an evaporative cooling facility for storing fruits and vegetables. Department of Agricultural Engineering, University of Agriculture, Abeokuta, B.Eng.; 2010.
Singh S, Singh AK, Joshi HK, Lata K, Bagle BG, More TA. Effect of zero energy cool chamber and post-harvest treatments on shelf-life of fruits under semi-arid environment of Western India. Part 1. Ber fruits. Journal of Food Science and Technology. 2010;47(4):446-449.
Jany MNH, Sarker MARC, Mazumder MFH, Shikder MFH. Effect of storage conditions on quality and shelf life of selected winter vegetables. Journal of the Bangladesh Agricultural University, 6(452-2016-35496); 2008.
Nobel N. Evaporative cooling, practical action technology, challenging poverty. Bourton, UK; 2003.
Kitinoja L. Use of cold chains for reducing food losses in developing countries. PEF White Paper No.13-03. 2013;13:1-16.
Ogbuagu NJ, Green IA, Anyanwu CN, Ume JI. Performance evaluation of a composite-padded evaporative storage bin. Nigerian Journal of Technology (NIJOTECH). 2017;36(1):302-307.
Zakari MD, Abubakar YS, Muhammad YB, Shanono NJ, Nasidi NM, Abubakar MS, Muhammad AI, Lawan I, Ahmad RK. Design and construction of an evaporative cooling system for the storage of fresh tomato. ARPN Journal of Engineering and Applied Sciences. 2016;11(4).
Deoraj S, Ekwue EI, Birch R. An evaporative cooler for the storage of fresh fruits and vegetables. The Western Indian Journal of Engineering. 2015;38(1):86-95.
Kumari K, Kumar S, Krishna G. Storage analysis of fruits and vegetables stored in low cost earthen pot cooling chamber and Pusa zero energy cool chamber; 2018.
Ambuko J, Wanjiru F, Chemining’wa GN, Owino WO, Mwachoni E. Preservation of postharvest quality of leafy amaranth (Amaranthus spp.) vegetables using evaporative cooling. Journal of Food Quality; 2017.
Kale SJ, Nath P. Kinetics of quality changes in tomatoes stored in evaporative cooled room in Hot Region. Int. J. Curr. Microbiol. App. Sci. 2018;7(6):1104-1112.
Verploegen E, Sanogo O, Chagomoka T. Evaluation of low-cost evaporative cooling technologies for improved vegetable storage in Mali. IEEE Global Humanitarian Technology Conference (GHTC). IEEE. 2018;1-8.
Lacey K, Hancock N, Ramsey H. Measuring internal maturity of citrus; 2009.
Rangana S. Titratable acidity in manual of fruit and vegetable products. Tala McGraw. Hill Pub. Cp. Ltd. New Delhi. 1979;7-8.
Jha SN. Development of a pilot scale evaporative cooled; 2008.
Olosunde WA. Performance evaluation of absorbent materials in the evaporative cooling system for the storage of fruits and vegetable. M.Sc. Thesis, Department of Agricultural Engineering, University of Ibadan, Ibadan; 2006.
Marikar FMMT, Wijerathnam RW. Post-harvest storage of lime fruits (Citrus aurantifolia) following high humidity and low temperature in a modified brick wall cooler. International Journal of Agricultural and Biological Engineering. 2010;3(3):80-86.