Thin layer drying kinetics and exergy analysis of turmeric (Curcuma longa) in a mixed mode forced convection solar tunnel dryer

Karthikeyan, A.; Murugavelh, S.

doi:10.1016/j.renene.2018.05.061

Cited by 138 publications

(45 citation statements)

References 22 publications

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“…As drying progresses and water content inside vermicelli decreases, the temperature difference of the inlet and outlet also decreases. As a result, the value of exergy outflow will be closer to exergy inflow, essentially increasing the exergy efficiency (Karthikeyan & Murugavelh, 2018;Rabha, Muthukumar, & Somayaji, 2017). The value of exergy efficiency found in this experiment are roughly the same as other solar dryer studies.…”

Section: Exergy Efficiencysupporting

confidence: 79%

Hybrid solar dryer for sugar‐palm vermicelli drying

Suherman

Utami

Ningrum

2020

J Food Process Engineering

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Sugar palm is an abundant palm in Indonesia and widely used for various foods, one of which is vermicelli. During vermicelli production, local farmers still implement open‐sun drying, which reduces the quality of vermicelli, requires long periods of time, and cannot be performed during poor weather. Therefore, in this study, a new method of vermicelli drying is introduced using a hybrid solar dryer, which consists of a solar dryer and an additional heater powered by liquefied natural gas. Hybrid solar drying is conducted at 40, 60, 80, and 100°C. With 2 hr of drying time, the final moisture contents of vermicelli dried using hybrid solar dryer have satisfy the standard limit, while the open‐sun drying and natural solar drying do not, indicating that hybrid solar drying is faster and more effective. Vermicelli drying occurs at the falling‐rate period and increasing drying temperature from 40 to 100°C increases dryer efficiency, energy utilization ratio, and exergy efficiency, from 13.02 to 17.02%, from 0.18 to 0.32, and from 67.4 to 83.6%, respectively. Although the overall quality of dried vermicelli is acceptable, increasing drying temperature from 40 to 100°C result in the damaged vermicelli surface as evident from SEM analysis and degradation of vermicelli whiteness value from 87.2 to 82.5. Practical applications The drying process is playing an important role in heat sensitive products dehydration. The present study provides an investigation of potential use of solar energy for drying of vermicelli which combine with the natural gas heating process. The results show that hybrid drying system could enhance the product quality of vermicelli and also reduce the drying process. During drying, proximate components of vermicelli essentially do not change but it alters the color of product.

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Section: Exergy Efficiencysupporting

confidence: 79%

Hybrid solar dryer for sugar‐palm vermicelli drying

Suherman

Utami

Ningrum

2020

J Food Process Engineering

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“…Very few literatures have been reported on the drying behavior of Curcuma longa (turmeric) dried in solar dryers (Borah et al, ; Karthikeyan & Murugavelh, ; Prasad & Vijay, ), but none of these studies discussed about the quality aspect of the dried products, which is an important parameter for justifying the commercialization and popularization of solar dryers. Further, there is no profound experimental study reported on the drying behavior of the precious herb, Curcuma zedoaria .…”

Section: Introductionmentioning

confidence: 99%

Performance comparison of mixed mode and indirect mode parallel flow forced convection solar driers for drying Curcuma zedoaria

Lakshmi

Muthukumar

Ekka

et al. 2019

J Food Process Engineering

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This study focuses on energy and drying kinetic analyses of Curcuma zedoaria (white turmeric) dried in mixed and indirect active parallel flow solar dryers. Dryer efficiency, specific energy consumption and drying rate are studied. The overall dryer efficiency of mixed mode (MFSCD) is 26.5% higher than indirect mode (IFSCD) solar dryer. Two term model and Verma model fit best for Curcuma zedoaria drying in MFSCD and IFSCD, respectively, and Logarithmic model is quite suitable for open sun drying (OSD). The effective moisture diffusivity of the product dried under MFSCD is highest as compared to IFSCD and OSD products. The quality analyses show that higher values of TFC (78.11 mg GAE/g of sample) and DPPH (120.56 μ mol of TE/g of sample) are reported in the samples dried in MFSCD as compared to IFSCD and OSD samples. Practical applications Conventional open sun drying is a common practice followed by small farmers for drying herbs and spices. Products dried under open sun lose their nutritional and medicinal values due to slow drying rate and improper heating. The present work focusses on the development of a low cost solar dryer for drying of high value medicinal herbs like Curcuma zedoaria, curcuma caesia, and black cardamom. Study of drying kinetics helps in improving the design aspects of solar dryer and optimization of the drying systems. Drying time of the Curcuma zedoaria dried in the developed dryer is about 60% less than the open sun drying and the retention of color, antioxidant, and texture of the solar dried products is excellent. The developed solar dryer will be suitable for small small‐scale farmers and can be scaled up to any size.

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“…En ambos experimentos (EXP1 y EXP2), la evolución del proceso de secado del EQ en los colectores solares CX y CY se representó mediante dos curvas: El porcentaje de humedad (MT) en función del tiempo y la velocidad de secado (VS) en función de la humedad. Estas curvas se elaboraron para cada experimento en forma separada, para lo cual MT se calculó con la ecuación 1, donde MH es la masa de EQ en el momento t, MD corresponde a la masa de la materia seca de la muestra de EQ, esta se calculó con base al porcentaje de materia seca determinado gravimétricamente a 105°C en estufa de aire Heratherm (Thermo Scientific, España) (Karthikeyan y Murugavelh, 2018). La velocidad de secado se determinó mediante el cálculo directo del incremento del contenido de humedad con respecto al tiempo, como se muestra en la ecuación 2 (Badaoui et al, 2019).…”

Section: Cinética De Secado Y Estimación De Parámetros Termo-físicosunclassified

Efecto del espesor de película y de la ubicación de la muestra en un secador solar directo, sobre la cinética de secado de ensilado de vísceras de tilapia roja (Oreochromis sp)

2020

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Efecto del espesor de película y de la ubicación de la muestra en un secador solar directo Camaño Información Tecnológica -Vol. 31 Nº 1 -2020 53 Efecto del espesor de película y de la ubicación de la muestra en un secador solar directo, sobre la cinética de secado de ensilado de vísceras de tilapia roja (Oreochromis sp) * Autor a quien debe ser dirigida la correspondencia. ResumenSe evaluó el comportamiento en el secado de ensilado químico de vísceras de tilapia roja (Oreochromis sp), en función de la ubicación de la muestra dentro de un secador solar directo pasivo y del espesor de la película de la muestra. Se seleccionaron condiciones con base en criterios bromatológicos y microbiológicos, y parámetros cinéticos como el coeficiente de difusividad efectiva (Def). Luego se modeló la cinética de secado, utilizando seis modelos empíricos y uno fenomenológico. Los resultados mostraron que muestras con un espesor de 2.40mm y ubicadas en posiciones cerca de la salida de aire, tienen mejor comportamiento durante el secado garantizando un contenido de humedad del producto menor a 12%, y entregando valores más altos de Def. El modelo con el mejor ajuste fue el de Page, con más altos valores del coeficiente de correlación R 2 y menores desviaciones comparado con los valores experimentales. Se concluye que la zona de ubicación del producto en el secador y el espesor de la película, afectan de manera significativa las características del producto obtenido.Palabras clave: ensilaje químico; Oreochromis sp; secado solar directo; cinética de secado. Effect of film thickness and location of the sample inside a direct solar dryer on the drying kinetics of viscera silage of red tilapia AbstractDrying behavior of chemical silage of red tilapia viscera (Oreochromis sp) was evaluated, in a direct solar dryer, as a function of the location of the sample inside the dryer and of the thickness of the film sample. The experimental conditions were selected according to bromatological and microbiological criteria and kinetic parameters such as the effective diffusivity coefficient (Def). After that, the drying kinetics was modelled using six empirical models and one phenomenological model. The results showed that samples with 2.40mm of thickness have better behavior during drying achieving moisture content of less than 12% in the dried product in zones closer to the air exit, which in turn gave higher Def. The Page model provided the best fiiting of the data, with higher values of the correlation coefficient and lower deviations compared to experimental data. It is concluded that he location of the sample inside the dryer and the film thickness, significantly affect the characteristics of the product obtained.

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Thin layer drying kinetics and exergy analysis of turmeric (Curcuma longa) in a mixed mode forced convection solar tunnel dryer

Cited by 138 publications

References 22 publications

Hybrid solar dryer for sugar‐palm vermicelli drying

Hybrid solar dryer for sugar‐palm vermicelli drying

Performance comparison of mixed mode and indirect mode parallel flow forced convection solar driers for drying Curcuma zedoaria

Efecto del espesor de película y de la ubicación de la muestra en un secador solar directo, sobre la cinética de secado de ensilado de vísceras de tilapia roja (Oreochromis sp)

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