MERAL Myanmar Education Research and Learning Portal
Item
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In Myanmar, people enjoy consuming vegetables in daily diet. However, there is almost no post-harvest technology resulting in nutritional and economic losses during season. Solar drying technology is one of the most promising alternatives to reduce the postharvest losses. \nThe solar cabinet drying system was designed and constructed to operate on the principle of convective heat flow. The design is the indirect type passive solar drying system to dry agriculture products inside the dryer. The absorber plate of the solar collector attained a temperature of an average 65°C during daylight condition whilst inside the dryer of 55°C. The thermal performance of the solar collector was found to be poor because of low convective heat\ntransfer from absorber to air. From the anemometer reading the air velocity inside the dryer was found to be 0.1 ms-1. The efficiency of the dryer design was determined by pick-up efficiency, collection efficiency and system drying efficiency. \nThe distributed (indirect type) solar cabinet dryer (DSCD) was modified into forced convection solar cabinet dryer. An indirect forced convection solar cabinet dryer integrated with sensible heat storage material (pebble.) bad been developed and tested its performance. In addition, the system consists of air blower to induce forced air circulation. The average air velocity is 0.5 ms-1and the maximum absorber temperature of 70°C and chamber temperature of 50°C. The performance evaluation of forced convection solar cabinet dryer (FCSCD) was computed and compared to with DSCD. The results showed FCSCD had significant (p\u003c0.05) than the other three methods in moisture reduction.\nThe physico-chemical characteristics, minerals and heavy metals constituents and rehydration ratios of dried roselle were determined and compared with fresh and commercial products. Water activity and microbiological examination of dried products were also performed to extend shelf life of dried products. The shelf life of three month observed for dried products. Fresh samples were also investigated residual pesticides to assure toxic substances in dried products for consumer safety. The organoleptic properties of rehydrated products were also determined by the 9-point Hedonic Scale Rating Test. The information and knowledge that will be generated from the study will serve to produce the traditional products from locally available raw materials, which include dried food products."}]}, "item_1583103108160": {"attribute_name": "Keywords", "attribute_value_mlt": [{"interim": "DSCD"}, {"interim": "FCSCD"}, {"interim": "pick-up efficiency"}, {"interim": "collection efficiency"}, {"interim": "system drying efficiency"}]}, "item_1583103120197": {"attribute_name": "Files", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_access", "date": [{"dateType": "Available", "dateValue": "2020-12-23"}], "displaytype": "preview", "download_preview_message": "", "file_order": 0, "filename": "32.pdf", "filesize": [{"value": "4.2 MB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_0", "mimetype": "application/pdf", "size": 4200000.0, "url": {"url": "https://meral.edu.mm/record/7003/files/32.pdf"}, "version_id": "6d79c05f-2d62-4153-a5a0-ddde1b37cdae"}]}, "item_1583103131163": {"attribute_name": "Journal articles", "attribute_value_mlt": [{"subitem_journal_title": "Myanmar Universities\u0027 Research Conference 2019", "subitem_pages": "124-131"}]}, "item_1583105942107": {"attribute_name": "Authors", "attribute_value_mlt": [{"subitem_authors": [{"subitem_authors_fullname": "Pansy Kyaw Hla"}, {"subitem_authors_fullname": "Thin Thin Khaing"}, {"subitem_authors_fullname": "Yin Mar Naing"}]}]}, "item_1583108359239": {"attribute_name": "Upload type", "attribute_value_mlt": [{"interim": "Publication"}]}, "item_1583108428133": {"attribute_name": "Publication type", "attribute_value_mlt": [{"interim": "Journal article"}]}, "item_1583159729339": {"attribute_name": "Publication date", "attribute_value": "2019-05-24"}, "item_title": "Performance Evaluation of Makeshift Solar Cabinet Dryers for Drying Roselle", "item_type_id": "21", "owner": "16", "path": ["1582967436313"], "permalink_uri": "http://hdl.handle.net/20.500.12678/0000007003", "pubdate": {"attribute_name": "Deposited date", "attribute_value": "2020-12-23"}, "publish_date": "2020-12-23", "publish_status": "0", "recid": "7003", "relation": {}, "relation_version_is_last": true, "title": ["Performance Evaluation of Makeshift Solar Cabinet Dryers for Drying Roselle"], "weko_shared_id": -1}
Performance Evaluation of Makeshift Solar Cabinet Dryers for Drying Roselle
http://hdl.handle.net/20.500.12678/0000007003
http://hdl.handle.net/20.500.12678/0000007003f27d4944-cedc-4ca9-9f58-225a79a53c73
eff9ed0f-44a2-4db4-8ba5-00b8673472f6
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32.pdf (4.2 MB)
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Publication type | ||||||
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Journal article | ||||||
Upload type | ||||||
Publication | ||||||
Title | ||||||
Title | Performance Evaluation of Makeshift Solar Cabinet Dryers for Drying Roselle | |||||
Language | en | |||||
Publication date | 2019-05-24 | |||||
Authors | ||||||
Pansy Kyaw Hla | ||||||
Thin Thin Khaing | ||||||
Yin Mar Naing | ||||||
Description | ||||||
Myanmar has good solar resource potential, having Global Horizontal Irradiation (GHI) levels of between 1,600 and 2,000 kWh/m2/yr., and average Direct Normal Irradiation (DNI) levels of about 1,400 kWh/m2/yr. In Myanmar, people enjoy consuming vegetables in daily diet. However, there is almost no post-harvest technology resulting in nutritional and economic losses during season. Solar drying technology is one of the most promising alternatives to reduce the postharvest losses. The solar cabinet drying system was designed and constructed to operate on the principle of convective heat flow. The design is the indirect type passive solar drying system to dry agriculture products inside the dryer. The absorber plate of the solar collector attained a temperature of an average 65°C during daylight condition whilst inside the dryer of 55°C. The thermal performance of the solar collector was found to be poor because of low convective heat transfer from absorber to air. From the anemometer reading the air velocity inside the dryer was found to be 0.1 ms-1. The efficiency of the dryer design was determined by pick-up efficiency, collection efficiency and system drying efficiency. The distributed (indirect type) solar cabinet dryer (DSCD) was modified into forced convection solar cabinet dryer. An indirect forced convection solar cabinet dryer integrated with sensible heat storage material (pebble.) bad been developed and tested its performance. In addition, the system consists of air blower to induce forced air circulation. The average air velocity is 0.5 ms-1and the maximum absorber temperature of 70°C and chamber temperature of 50°C. The performance evaluation of forced convection solar cabinet dryer (FCSCD) was computed and compared to with DSCD. The results showed FCSCD had significant (p<0.05) than the other three methods in moisture reduction. The physico-chemical characteristics, minerals and heavy metals constituents and rehydration ratios of dried roselle were determined and compared with fresh and commercial products. Water activity and microbiological examination of dried products were also performed to extend shelf life of dried products. The shelf life of three month observed for dried products. Fresh samples were also investigated residual pesticides to assure toxic substances in dried products for consumer safety. The organoleptic properties of rehydrated products were also determined by the 9-point Hedonic Scale Rating Test. The information and knowledge that will be generated from the study will serve to produce the traditional products from locally available raw materials, which include dried food products. |
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Keywords | ||||||
DSCD, FCSCD, pick-up efficiency, collection efficiency, system drying efficiency | ||||||
Journal articles | ||||||
Myanmar Universities' Research Conference 2019 | ||||||
124-131 |