Secagem de grãos residuais de urucum por exposição direta ao sol combinada com secagem em secador acumulador de calor

Santos, Dyego da Costa; Queiroz, Alexandre José de Melo; Figueirêdo, Rossana Maria Feitosa de; Oliveira, Emanuel Neto Alves de

doi:10.5433/1679-0359.2014v35n1p277

Cited by 4 publications

(4 citation statements)

References 14 publications

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“…The effective diffusivity in solar dryer was 1.47 × 10 -9 , 1.20 × 10 -9 and 0.63 × 10 -9 m 2 s -1 for the thicknesses of 11.95, 8.06 and 4.11 mm, respectively, whereas the drying by exposure to the sun led to values of 1.29 × 10 -9 , 1.11 × 10 -9 and 0.54 × 10 -9 m 2 s -1 for the respective thicknesses of 11.95, 8.06 and 4.11 mm. In all experiments the values were within the range from 10 -11 to 10 -9 m 2 s -1 mentioned by Madamba et al (1996), for the diffusivity of foodstuffs, and close to the values found by Santos et al (2014b) and Dhalsamant et al (2017), when drying residual grains of annatto and potato cylinders using solar energy, respectively. For the same layer thickness, it was observed that the samples dehydrated in the solar dryer had the highest effective diffusion coefficients, being positively correlated with the high temperatures of the solar dryer, which increased the vibrational state of the water molecules (Mghazli et al, 2017).…”

Section: Moisture Effective Diffusivitysupporting

confidence: 87%

Solar drying of residue from Brazil nut processing

Nascimento

Oliveira

Santos

et al. 2021

Braz. J. Food Technol.

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Brazil nuts are often used for direct consumption or in the preparation process of water-soluble extract. After obtaining the water-soluble extract, a large amount of Brazil nut residues with good sensory characteristics are generated. Thus, this study aimed to dry Brazil nut processing residues in layers with different thicknesses in a direct solar dryer as well as by direct exposure to the sun, in order to fit different mathematical models to the experimental data of drying kinetics, and calculate the drying rates and effective diffusivity. The drying procedures began at 9 a.m. on a concrete base, for samples dried by direct exposure to the sun, and in a solar dryer constructed with expanded polystyrene foam zinc plated and a glass cover. The mass loss of the samples was monitored by weighing at regular times until the hygroscopic equilibrium was obtained. The direct solar dryer had temperatures about 80% higher than those recorded in the open environmental air temperature. Drying rates were higher in dehydrations performed in the solar dryer compared to the drying by exposure to the sun. The Midilli model was selected as the most adequate for predicting the drying of the samples under all experimental conditions, showing coefficients of determination above 0.99. The effective diffusion coefficients of moisture were higher in samples dehydrated in the solar dryer when compared to those dried by exposure to the sun. Regarding the research conducted under the experimental conditions of this study, the performance of the solar dryer to dry Brazil nut processing residues was satisfactory.

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Section: Moisture Effective Diffusivitysupporting

confidence: 87%

Solar drying of residue from Brazil nut processing

Nascimento

Oliveira

Santos

et al. 2021

Braz. J. Food Technol.

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“…All mathematical models evaluated had R 2 values higher than 0.90 and can be used to predict satisfactorily the drying kinetics of the samples of the two drying processes, of cowpea bean. Santos et al (2014) studied the drying of residues of 'urucum' (Bixa orellana) grains by direct exposure to the sun combined with drying in heat accumulator dryer and obtained good results in the fitting of the models. Doymaz (2011) studied sun drying of okra and also obtained good fits using the models employed in the present study.…”

Section: Resultsmentioning

confidence: 99%

“…Studies to overcome such inconvenience should consider the accumulation of solar energy during the day in order to maintain the drying during the night, though at a lower rate (Tripathy & Kumar, 2009;Queiroz et al, 2011;Santos et al, 2014). Hence, the use of water to accumulate solar energy during the day has the advantage of allowing the utilization of a relatively small volume of liquid and simple solar collectors.…”

Section: Introductionmentioning

confidence: 99%

Solar drying of cowpea bean combined with drying in a heat accumulator dryer

Alves

Queiroz

Figueirêdo

et al. 2019

Rev. bras. eng. agríc. ambient.

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As solar radiation is abundant in Brazil during most of the year and this source of energy is renewable and non-polluting par excellence, solar drying of agricultural products is a promising methodology. The objective of this study was to dry cowpea [Vigna unguiculata (L.) Walp.] bean grains using solar energy in different exposure times, adjusting the mathematical models and calculation of the effective diffusivity. Drying was performed during the day with samples exposed to the sun; during the night, half of the samples were put to dry in a heat accumulator dryer for nighttime drying and the other half was left on a laboratory bench as control. Cowpea bean grains had initial and final moisture contents of 65.42 and 6.73% d.b. (after drying in the heat accumulator dryer), respectively. The models Approximation of Diffusion, Page, Verma, Logarithmic and Two Terms were fitted to the drying kinetics and all of them fitted well to the experimental data, with coefficients of determination (R2) higher than 0.98, mean square deviations (MSD) less than 0.01 and chi-square (χ2) values lower than 0.0001. The effective diffusivity values were of the order of 10-11 m2 s-1 for the cowpea bean samples. The heat accumulator dryer was effective as a complement to the drying by exposure to the sun, maintaining a suitable temperature for nighttime drying.

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“…Atualmente, tal subproduto tem sido estudado pelas suas potencialidades para fins alimentares alternativos na pecuária podendo reduzir custos na produção animal; notadamente, alguns estudos estão relacionados às suas potencialidades para incorporação da alimentação humana (Santos et al, 2014).…”

Section: Introductionunclassified

Armazenamento de grãos residuais de urucum sob atmosfera controlada

Brito

Queiroz

Figueirêdo

et al. 2015

Rev. bras. eng. agríc. ambient.

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R E S U M ONeste trabalho avaliou-se a estabilidade de grãos residuais de urucum acondicionados em embalagens flexíveis laminadas durante 90 dias de armazenamento em condições controladas de temperatura (25 e 40 °C) e umidades relativas (55 e 83%). As amostras foram analisadas a cada 15 dias, por meio da análise do teor de água, atividade de água, pH, acidez titulável, cor (luminosidade, intensidade de vermelho e intensidade de amarelo) proteína bruta, amido e bixina. Observou-se, no decorrer dos tempos de armazenamento, que as embalagens não evitaram a absorção de água acarretando em aumentos do teor de água (42,62; 43,06; 41,78 e 42,90%), atividade de água (6,39; 6,94; 5,97 e 6,94%), acidez titulável (12,28; 13,79; 9,09 e 13,79%) e luminosidade (4,48; 12,18; 4,73; 4,91%) e ocorreram reduções na intensidade de vermelho (8,19; 7,77; 4,66 e 7,93%), pH (9,21; 8,56; 12,44 e 18,12) e bixina (51,72; 56,32; 57,47 e 55,17%) respectivamente, para as seguintes combinações de umidades relativas e temperaturas (55% e 25 ou 40 °C; 85% e 25 ou 40 °C). Storage of waste grains of annatto under controlled atmosphere A B S T R A C TThis study evaluated the stability of residual annatto beans packed in flexible laminated packaging during 90 days of storage under controlled temperature conditions (25 and 40 °C) and relative humidity (55 to 83%). Samples were analysed every 15 days, for analyzing the moisture content, water activity, pH, acidity, color (brightness, redness and yellowness), protein, starch and bixin. It was observed during the storage time of the packaging did not prevent the absorption of water leading to increases in moisture content (42.62; 43.06; 41.78 and 42.90%), water activity (6.39; 6.94; 5.97 and 6.94%), titratable acidity (12.28; 13.79; 13.79 and 9.09%), and brightness (4.48; 12.18; 4.73 and 4.91%) occurred reductions in redness (8.19; 7.77; 4.66 and 7.93%), pH (9.21; 8.56; 12.44 and 18.12%) and bixin (51.72; 56.32; 57.47 and 55.17%), respectively, for the following combinations of relative humidity and temperature (55% and 25 or 40 °C, 85% and 25 or 40 °C). Palavras-chave:Bixa orellana L. bixina embalagem laminada umidade relativa resíduos agroindustriais

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Secagem de grãos residuais de urucum por exposição direta ao sol combinada com secagem em secador acumulador de calor

Cited by 4 publications

References 14 publications

Solar drying of residue from Brazil nut processing

Solar drying of residue from Brazil nut processing

Solar drying of cowpea bean combined with drying in a heat accumulator dryer

Armazenamento de grãos residuais de urucum sob atmosfera controlada

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