Water sorption isotherms and drying characteristics of rupturewort (Herniaria hirsuta) during a convective solar drying for a better conservation
•Sorption isotherms and drying kinetics were determined in this study.•Optimal water activity for conservation of Herniaria hirsuta is 0.35.•Modeling of sorption isotherms and drying kinetics were investigated.•The effective diffusivity values changed from 2.5312 10−9–18.0511 10−9 m2·s−1.•Solar ener...
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| Veröffentlicht in: | Solar energy 2020-05, Vol.201, p.916-926 |
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| creator | Bahammou, Younes Moussaoui, Haytem Lamsayeh, Hamza Tagnamas, Zakaria Kouhila, Mounir Ouaabou, Rachida Lamharrar, Abdelkader Idlimam, Ali |
| description | •Sorption isotherms and drying kinetics were determined in this study.•Optimal water activity for conservation of Herniaria hirsuta is 0.35.•Modeling of sorption isotherms and drying kinetics were investigated.•The effective diffusivity values changed from 2.5312 10−9–18.0511 10−9 m2·s−1.•Solar energy is proven to be an effective solution for conserving medicinal plants.
Free water contained in porous structure of food plays a fundamental role in proliferation of microorganisms and bacteria that can damage the product materials. This work presents a thermo-kinetic study carried out in a natural and forced convection solar dryer; the objective was to establish the optimal conditions for drying and storing Herniaria hirsuta by testing the impact of different aerothermal conditions (air temperature, air velocity) on water loss of fresh Herniaria hirsuta. The kinetics of drying is studied for three temperatures (50, 60 and 70 °C) in two-air velocities (0.09 and 0.18 m/s). The optimal water activity which is related to conservation is 0.28. The LESPAM model was found to be the most appropriate for describing the sorption curves. The air drying temperature is a principal factor influencing the drying kinetics; the drying rate decreases in low air drying temperature, the air velocity had a small impact on the drying kinetics of Herniaria hirsuta. The Midilli-Kuck model was found to be the best fitted drying curves in thin layers for Herniaria hirsuta. The effective diffusivity of moisture water values changed from 2.5312 10−9 to 18.0511 10−9 m2·s−1, and increased simultaneously with the increase of temperature. The average activation energy of the diffusion process is obtained to be 2938.46 kJ/kg; it expresses the temperature effect on the diffusion coefficient. Dried Herniaria hirsuta under the maximum drying parameters showed highest retention of antioxidant activity, while the total phenolics and flavonoids were decreased by 10 and 46%, respectively. |
| doi_str_mv | 10.1016/j.solener.2020.03.071 |
| format | Article |
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Free water contained in porous structure of food plays a fundamental role in proliferation of microorganisms and bacteria that can damage the product materials. This work presents a thermo-kinetic study carried out in a natural and forced convection solar dryer; the objective was to establish the optimal conditions for drying and storing Herniaria hirsuta by testing the impact of different aerothermal conditions (air temperature, air velocity) on water loss of fresh Herniaria hirsuta. The kinetics of drying is studied for three temperatures (50, 60 and 70 °C) in two-air velocities (0.09 and 0.18 m/s). The optimal water activity which is related to conservation is 0.28. The LESPAM model was found to be the most appropriate for describing the sorption curves. The air drying temperature is a principal factor influencing the drying kinetics; the drying rate decreases in low air drying temperature, the air velocity had a small impact on the drying kinetics of Herniaria hirsuta. The Midilli-Kuck model was found to be the best fitted drying curves in thin layers for Herniaria hirsuta. The effective diffusivity of moisture water values changed from 2.5312 10−9 to 18.0511 10−9 m2·s−1, and increased simultaneously with the increase of temperature. The average activation energy of the diffusion process is obtained to be 2938.46 kJ/kg; it expresses the temperature effect on the diffusion coefficient. Dried Herniaria hirsuta under the maximum drying parameters showed highest retention of antioxidant activity, while the total phenolics and flavonoids were decreased by 10 and 46%, respectively.</description><identifier>ISSN: 0038-092X</identifier><identifier>EISSN: 1471-1257</identifier><identifier>DOI: 10.1016/j.solener.2020.03.071</identifier><language>eng</language><publisher>New York: Elsevier Ltd</publisher><subject>Air drying ; Air temperature ; Antioxidants ; Bioactive compounds ; Conservation ; Convection ; Diffusion coefficient ; Diffusion effects ; Drying ; Drying characteristic curve ; Flavonoids ; Forced convection ; Herniaria hirsuta ; Kinetics ; Microorganisms ; Modeling ; Phenols ; Solar dryers ; Solar drying ; Solar energy ; Sorption ; Temperature effects ; Thin films ; Velocity ; Water activity ; Water conservation ; Water loss</subject><ispartof>Solar energy, 2020-05, Vol.201, p.916-926</ispartof><rights>2020 International Solar Energy Society</rights><rights>Copyright Pergamon Press Inc. May 1, 2020</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c337t-a56a3b9f98c253c292229f0d0ecfd2ec00cb5268b43be5cb363a183c018e6e273</citedby><cites>FETCH-LOGICAL-c337t-a56a3b9f98c253c292229f0d0ecfd2ec00cb5268b43be5cb363a183c018e6e273</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.solener.2020.03.071$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3549,27923,27924,45994</link.rule.ids></links><search><creatorcontrib>Bahammou, Younes</creatorcontrib><creatorcontrib>Moussaoui, Haytem</creatorcontrib><creatorcontrib>Lamsayeh, Hamza</creatorcontrib><creatorcontrib>Tagnamas, Zakaria</creatorcontrib><creatorcontrib>Kouhila, Mounir</creatorcontrib><creatorcontrib>Ouaabou, Rachida</creatorcontrib><creatorcontrib>Lamharrar, Abdelkader</creatorcontrib><creatorcontrib>Idlimam, Ali</creatorcontrib><title>Water sorption isotherms and drying characteristics of rupturewort (Herniaria hirsuta) during a convective solar drying for a better conservation</title><title>Solar energy</title><description>•Sorption isotherms and drying kinetics were determined in this study.•Optimal water activity for conservation of Herniaria hirsuta is 0.35.•Modeling of sorption isotherms and drying kinetics were investigated.•The effective diffusivity values changed from 2.5312 10−9–18.0511 10−9 m2·s−1.•Solar energy is proven to be an effective solution for conserving medicinal plants.
Free water contained in porous structure of food plays a fundamental role in proliferation of microorganisms and bacteria that can damage the product materials. This work presents a thermo-kinetic study carried out in a natural and forced convection solar dryer; the objective was to establish the optimal conditions for drying and storing Herniaria hirsuta by testing the impact of different aerothermal conditions (air temperature, air velocity) on water loss of fresh Herniaria hirsuta. The kinetics of drying is studied for three temperatures (50, 60 and 70 °C) in two-air velocities (0.09 and 0.18 m/s). The optimal water activity which is related to conservation is 0.28. The LESPAM model was found to be the most appropriate for describing the sorption curves. The air drying temperature is a principal factor influencing the drying kinetics; the drying rate decreases in low air drying temperature, the air velocity had a small impact on the drying kinetics of Herniaria hirsuta. The Midilli-Kuck model was found to be the best fitted drying curves in thin layers for Herniaria hirsuta. The effective diffusivity of moisture water values changed from 2.5312 10−9 to 18.0511 10−9 m2·s−1, and increased simultaneously with the increase of temperature. The average activation energy of the diffusion process is obtained to be 2938.46 kJ/kg; it expresses the temperature effect on the diffusion coefficient. Dried Herniaria hirsuta under the maximum drying parameters showed highest retention of antioxidant activity, while the total phenolics and flavonoids were decreased by 10 and 46%, respectively.</description><subject>Air drying</subject><subject>Air temperature</subject><subject>Antioxidants</subject><subject>Bioactive compounds</subject><subject>Conservation</subject><subject>Convection</subject><subject>Diffusion coefficient</subject><subject>Diffusion effects</subject><subject>Drying</subject><subject>Drying characteristic curve</subject><subject>Flavonoids</subject><subject>Forced convection</subject><subject>Herniaria hirsuta</subject><subject>Kinetics</subject><subject>Microorganisms</subject><subject>Modeling</subject><subject>Phenols</subject><subject>Solar dryers</subject><subject>Solar drying</subject><subject>Solar energy</subject><subject>Sorption</subject><subject>Temperature effects</subject><subject>Thin films</subject><subject>Velocity</subject><subject>Water activity</subject><subject>Water conservation</subject><subject>Water loss</subject><issn>0038-092X</issn><issn>1471-1257</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNqFkM1qGzEQx0VJoI7TRygIemkOux1J3q9TKKatC4ZcEpKb0Gpnaxl75Yy0Dn6MvnG12Dn3NIf5f8z8GPssIBcgym_bPPgdDki5BAk5qBwq8YHNxKISmZBFdcVmAKrOoJEvH9lNCFsAUYm6mrG_zyYi8eDpEJ0fuAs-bpD2gZuh4x2d3PCH240hY5POhehs4L7nNB7iSPjmKfKvK6TBGXKGbxyFMZo73o00OQ23fjiije6IqWRn6D2z95S2LcapPokC0tFMJ9yy697sAn66zDl7-vnjcbnK1g-_fi-_rzOrVBUzU5RGtU3f1FYWyspGStn00AHavpNoAWxbyLJuF6rFwraqVEbUyoKosURZqTn7cs49kH8dMUS99SMNqVLLhaoWSpWFTKrirLLkQyDs9YHc3tBJC9ATfb3VF_p6oq9B6UQ_-e7PPkwvHF3aButwsNg5Sjh0591_Ev4BZtKU1Q</recordid><startdate>20200501</startdate><enddate>20200501</enddate><creator>Bahammou, Younes</creator><creator>Moussaoui, Haytem</creator><creator>Lamsayeh, Hamza</creator><creator>Tagnamas, Zakaria</creator><creator>Kouhila, Mounir</creator><creator>Ouaabou, Rachida</creator><creator>Lamharrar, Abdelkader</creator><creator>Idlimam, Ali</creator><general>Elsevier Ltd</general><general>Pergamon Press Inc</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7ST</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>KR7</scope><scope>L7M</scope><scope>SOI</scope></search><sort><creationdate>20200501</creationdate><title>Water sorption isotherms and drying characteristics of rupturewort (Herniaria hirsuta) during a convective solar drying for a better conservation</title><author>Bahammou, Younes ; Moussaoui, Haytem ; Lamsayeh, Hamza ; Tagnamas, Zakaria ; Kouhila, Mounir ; Ouaabou, Rachida ; Lamharrar, Abdelkader ; Idlimam, Ali</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c337t-a56a3b9f98c253c292229f0d0ecfd2ec00cb5268b43be5cb363a183c018e6e273</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Air drying</topic><topic>Air temperature</topic><topic>Antioxidants</topic><topic>Bioactive compounds</topic><topic>Conservation</topic><topic>Convection</topic><topic>Diffusion coefficient</topic><topic>Diffusion effects</topic><topic>Drying</topic><topic>Drying characteristic curve</topic><topic>Flavonoids</topic><topic>Forced convection</topic><topic>Herniaria hirsuta</topic><topic>Kinetics</topic><topic>Microorganisms</topic><topic>Modeling</topic><topic>Phenols</topic><topic>Solar dryers</topic><topic>Solar drying</topic><topic>Solar energy</topic><topic>Sorption</topic><topic>Temperature effects</topic><topic>Thin films</topic><topic>Velocity</topic><topic>Water activity</topic><topic>Water conservation</topic><topic>Water loss</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Bahammou, Younes</creatorcontrib><creatorcontrib>Moussaoui, Haytem</creatorcontrib><creatorcontrib>Lamsayeh, Hamza</creatorcontrib><creatorcontrib>Tagnamas, Zakaria</creatorcontrib><creatorcontrib>Kouhila, Mounir</creatorcontrib><creatorcontrib>Ouaabou, Rachida</creatorcontrib><creatorcontrib>Lamharrar, Abdelkader</creatorcontrib><creatorcontrib>Idlimam, Ali</creatorcontrib><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Environment Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Environment Abstracts</collection><jtitle>Solar energy</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Bahammou, Younes</au><au>Moussaoui, Haytem</au><au>Lamsayeh, Hamza</au><au>Tagnamas, Zakaria</au><au>Kouhila, Mounir</au><au>Ouaabou, Rachida</au><au>Lamharrar, Abdelkader</au><au>Idlimam, Ali</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Water sorption isotherms and drying characteristics of rupturewort (Herniaria hirsuta) during a convective solar drying for a better conservation</atitle><jtitle>Solar energy</jtitle><date>2020-05-01</date><risdate>2020</risdate><volume>201</volume><spage>916</spage><epage>926</epage><pages>916-926</pages><issn>0038-092X</issn><eissn>1471-1257</eissn><abstract>•Sorption isotherms and drying kinetics were determined in this study.•Optimal water activity for conservation of Herniaria hirsuta is 0.35.•Modeling of sorption isotherms and drying kinetics were investigated.•The effective diffusivity values changed from 2.5312 10−9–18.0511 10−9 m2·s−1.•Solar energy is proven to be an effective solution for conserving medicinal plants.
Free water contained in porous structure of food plays a fundamental role in proliferation of microorganisms and bacteria that can damage the product materials. This work presents a thermo-kinetic study carried out in a natural and forced convection solar dryer; the objective was to establish the optimal conditions for drying and storing Herniaria hirsuta by testing the impact of different aerothermal conditions (air temperature, air velocity) on water loss of fresh Herniaria hirsuta. The kinetics of drying is studied for three temperatures (50, 60 and 70 °C) in two-air velocities (0.09 and 0.18 m/s). The optimal water activity which is related to conservation is 0.28. The LESPAM model was found to be the most appropriate for describing the sorption curves. The air drying temperature is a principal factor influencing the drying kinetics; the drying rate decreases in low air drying temperature, the air velocity had a small impact on the drying kinetics of Herniaria hirsuta. The Midilli-Kuck model was found to be the best fitted drying curves in thin layers for Herniaria hirsuta. The effective diffusivity of moisture water values changed from 2.5312 10−9 to 18.0511 10−9 m2·s−1, and increased simultaneously with the increase of temperature. The average activation energy of the diffusion process is obtained to be 2938.46 kJ/kg; it expresses the temperature effect on the diffusion coefficient. Dried Herniaria hirsuta under the maximum drying parameters showed highest retention of antioxidant activity, while the total phenolics and flavonoids were decreased by 10 and 46%, respectively.</abstract><cop>New York</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.solener.2020.03.071</doi><tpages>11</tpages></addata></record> |
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| subjects | Air drying Air temperature Antioxidants Bioactive compounds Conservation Convection Diffusion coefficient Diffusion effects Drying Drying characteristic curve Flavonoids Forced convection Herniaria hirsuta Kinetics Microorganisms Modeling Phenols Solar dryers Solar drying Solar energy Sorption Temperature effects Thin films Velocity Water activity Water conservation Water loss |
| title | Water sorption isotherms and drying characteristics of rupturewort (Herniaria hirsuta) during a convective solar drying for a better conservation |
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