Determination of desorption isotherms, latent heat and isosteric heat of pequi diaspore
ABSTRACT The objective was to determine water sorption isotherms of diaspores of pequi fruits in order to obtain information on the amount of water that this product desorbs at the temperatures of 10, 20, 30 and 40 °C and water activities from 0.20 to 0.89, adjusting different mathematical models to...
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Universidade Federal de Campina Grande
2016-05-01
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| Series: | Revista Brasileira de Engenharia Agrícola e Ambiental |
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| author | Kelly A. de Sousa Osvaldo Resende Bruno de S. Carvalho |
| author_facet | Kelly A. de Sousa Osvaldo Resende Bruno de S. Carvalho |
| author_sort | Kelly A. de Sousa |
| collection | DOAJ |
| description | ABSTRACT The objective was to determine water sorption isotherms of diaspores of pequi fruits in order to obtain information on the amount of water that this product desorbs at the temperatures of 10, 20, 30 and 40 °C and water activities from 0.20 to 0.89, adjusting different mathematical models to experimental data, and to determine its latent heat and isosteric heat. The equilibrium moisture content was obtained through the indirect static method, using the device Hygropalm Model Aw 1. The Modified Henderson model was the one that best fitted the data and was selected to predict the equilibrium moisture content of pequi diaspore. It was observed that the higher the temperature for the same equilibrium moisture content (% d.b.), the higher the water activity values. As temperature values increased, there was a reduction in the vaporization latent heat of the product. Isosteric heat values of diaspores of pequi fruits in the moisture content range of 4.02 to 16.63 (% d.b.) varied from 2,776.49 to 2,558.39 kJ kg-1. |
| format | Article |
| id | doaj-art-3da5a9945ab34efea93ed4f2e48e1e83 |
| institution | Kabale University |
| issn | 1807-1929 |
| language | English |
| publishDate | 2016-05-01 |
| publisher | Universidade Federal de Campina Grande |
| record_format | Article |
| series | Revista Brasileira de Engenharia Agrícola e Ambiental |
| spelling | doaj-art-3da5a9945ab34efea93ed4f2e48e1e832025-08-20T03:55:40ZengUniversidade Federal de Campina GrandeRevista Brasileira de Engenharia Agrícola e Ambiental1807-19292016-05-0120549349810.1590/1807-1929/agriambi.v20n5p493-498S1415-43662016000500493Determination of desorption isotherms, latent heat and isosteric heat of pequi diasporeKelly A. de SousaOsvaldo ResendeBruno de S. CarvalhoABSTRACT The objective was to determine water sorption isotherms of diaspores of pequi fruits in order to obtain information on the amount of water that this product desorbs at the temperatures of 10, 20, 30 and 40 °C and water activities from 0.20 to 0.89, adjusting different mathematical models to experimental data, and to determine its latent heat and isosteric heat. The equilibrium moisture content was obtained through the indirect static method, using the device Hygropalm Model Aw 1. The Modified Henderson model was the one that best fitted the data and was selected to predict the equilibrium moisture content of pequi diaspore. It was observed that the higher the temperature for the same equilibrium moisture content (% d.b.), the higher the water activity values. As temperature values increased, there was a reduction in the vaporization latent heat of the product. Isosteric heat values of diaspores of pequi fruits in the moisture content range of 4.02 to 16.63 (% d.b.) varied from 2,776.49 to 2,558.39 kJ kg-1.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000500493&lng=en&tlng=enequilíbrio higroscópicoatividade de águapropriedades termodinâmicas |
| spellingShingle | Kelly A. de Sousa Osvaldo Resende Bruno de S. Carvalho Determination of desorption isotherms, latent heat and isosteric heat of pequi diaspore Revista Brasileira de Engenharia Agrícola e Ambiental equilíbrio higroscópico atividade de água propriedades termodinâmicas |
| title | Determination of desorption isotherms, latent heat and isosteric heat of pequi diaspore |
| title_full | Determination of desorption isotherms, latent heat and isosteric heat of pequi diaspore |
| title_fullStr | Determination of desorption isotherms, latent heat and isosteric heat of pequi diaspore |
| title_full_unstemmed | Determination of desorption isotherms, latent heat and isosteric heat of pequi diaspore |
| title_short | Determination of desorption isotherms, latent heat and isosteric heat of pequi diaspore |
| title_sort | determination of desorption isotherms latent heat and isosteric heat of pequi diaspore |
| topic | equilíbrio higroscópico atividade de água propriedades termodinâmicas |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000500493&lng=en&tlng=en |
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