scholarly journals Deshidratación de plátano (Musa paradisiaca) por medio de radiación solar en un secador directo

2020 ◽  
pp. 19-23
Author(s):  
Manuela Carrillo-Carrillo ◽  
Juan Daniel Castorena-Alemán ◽  
Fátima de los Ángeles García-Jimenéz ◽  
Juan Manuel García-González
Keyword(s):  
Natural Convection ◽  
Moisture Content ◽  
Forced Convection ◽  
Operating Temperature ◽  
Added Value ◽  
Drying Time ◽  
Musa Paradisiaca ◽  
Average Operating

The objective is to dehydrate banana (Musa paradisiaca) using two direct solar dryers. The purpose of dehydrating the banana, is to give an added value. The fruit is remove the peel, and cut into slices of 1.75 cm radius with a thickness of 0.525 cm. It is placed in two polymer mesh trays with dimensions of 24 cm by 34.2 cm. The initial moisture is determined, and weighed. Later they are introduced to solar dryers. For both dryers the humidity and the temperature of the medium are determined every 15 min, and the color is determined every hour. Finally, the moisture content of the final product is determined. Each test is done in triplicate. The percentage of humidity decreases from 57.23% to 20.87% in natural convection and 20.80% in forced convection. The drying time is 8 hours and the average operating temperature is 38.7 ° C for natural convection and 34.68 ° C for forced convection. In dehydration the percentage of humidity decreases 36.36% on average in the two forms of operation. In forced convection the product darkens less.

scholarly journals Effect of pretrature with ultrasound in convention drying kinetics of bananas (musa paradisiaca)

Respuestas ◽  
2020 ◽  
Vol 25 (3) ◽  
Author(s):  
Yesenia Campo-Vera ◽  
Mauricio Eduardo Contreras ◽  
Sandra Liliana Flórez ◽  
Lucero Villamizar
Keyword(s):  
Negative Impact ◽  
Effective Diffusivity ◽  
Green Technology ◽  
Drying Kinetics ◽  
Added Value ◽  
Convective Drying ◽  
Control Treatment ◽  
Drying Time ◽  
Musa Paradisiaca ◽  
The Us

The use of ultrasound in food processing has increased in the last decade due to the reduction in times, temperatures, microbial and enzymatic inactivation, extraction of components of great interest to different industries; without altering or modifying its nutritional or organoleptic value during the transformation processes of raw materials into products with added value. Considering itself, a green technology by not causing a negative impact on the environment. In this work, the effect of US pretreatment (40KHz/130W/30°C /10, 20 and 30 min) on convective drying at 60°C / 2m / s of banana (musa paradisiaca) was evaluated. A diffusion model was used to describe the drying kinetics and to quantify the influence of the US on the effective diffusivity of water. Observing that the US significantly increased (p> 0.05) the drying speed in all the samples treated with an average reduction of 31% in the drying time with respect to the control treatment; reaching a weight loss of 77% with respect to the initial weight (3.8 to 0.9 g.). The exponential model is the most adequate to predict the experimental curves of banana drying and showed that the application of US increased both the effective diffusivity and the mass transfer coefficient, as corroborated by the values of the explained variance of 98.5 a 99.3%.

scholarly journals Thin Layer Mathematical Modelling of Cob Maize in a Natural Convection Solar Drier

2017 ◽  
Vol 7 (2) ◽  
pp. 37
Author(s):  
M Mukwangole ◽  
I. N. Simate
Keyword(s):  
Natural Convection ◽  
Relative Humidity ◽  
Moisture Content ◽  
Coefficient Of Determination ◽  
Drying Time ◽  
Ambient Relative Humidity ◽  
Safe Level ◽  
Content Ratio ◽  
Drying Curves ◽  
Maize Cobs

A semi- cylindrical natural convection solar tunnel drier (STD) was used for experiments to dry maize cobs that were partially field- dried. The air temperature recorded in the collector unit was higher than ambient temperature by 15.8oC to 20.8oC and this was effective in reducing the moisture content of maize cobs from 30 % wet basis to safe level storage moisture content of 12.5 % wet basis. Averages of solar radiation recorded during the experiments ranged from 585.6 W/m2 to 759.8 W/m2. The averages of relative humidity that prevailed in the drying unit ranged from 6.8 % to 18.2 % whereas the ambient relative humidity averaged from 27.3 % to 43.7 %. Drying time was examined with moisture content ratio as exponential and polynomial correlations. Fourteen different drying mathematical models available in literature were compared using their coefficients of determination to estimate solar drying curves. Based on statistical analysis of the results, Midilli drying model had the best fit to the experimental drying data of maize with a coefficient of determination R2= 0.99912 as compared to other models. 

Calculation of Moisture Content and Drying Rate during Microwave Drying

2013 ◽  
Vol 423-426 ◽  
pp. 746-749
Author(s):  
Samad Khani Moghanaki ◽  
Behnam Khoshandam ◽  
Mohammad Hosein Mirhaj
Keyword(s):  
High Temperature ◽  
Moisture Content ◽  
Microwave Power ◽  
Operating Temperature ◽  
Irradiation Time ◽  
Microwave Drying ◽  
Drying Rate ◽  
Microwave Method ◽  
Drying Process ◽  
Drying Time

Convectional dryerswork at high temperature and usually lead to loss of quality for sensitivebiomaterial products (especially in nutrition). In this way the researchersfound the microwave power more effective and suitable for drying processes. Someof microwave drying advantages include the following: short drying time, highquality of product, low operating temperature, flexibility in producing widerange of products and easier process controlling. The article calculated themoisture content and drying rate during drying process. Microwave power, holdertray speed, dimension of samples, irradiation time were considered; under theseconditions experiments were done and the results show that microwave method hasmore advantages as comparing with convectional methods.

scholarly journals Deshidratación de guayaba (Psidium guajava) en forma de rodaja mediante radiación solar en un secador directo

2019 ◽  
pp. 14-18
Author(s):  
Susana Tenorio-Reyes ◽  
Juan Daniel Robles-Ramírez ◽  
Ethson Uriel Carrera-Arellano ◽  
Juan Manuel García-González
Keyword(s):  
Natural Convection ◽  
Solar Radiation ◽  
Moisture Content ◽  
Forced Convection ◽  
Radiation Characteristic ◽  
Psidium Guajava ◽  
The State ◽  
Drying Process

The objective of this work is to reduce the moisture content of the guava (Psidium guajava) cut in slices, through the solar radiation characteristic in the area of the capital of the state of Zacatecas. Natural convection and forced convection were used to achieve the objective of this study. The selected guava comes from the municipality of Jalpa, Zacatecas. Moisture was evaluated with an OHAUS MB45 thermogravimetric scale, then the guava slices were placed in polymer mesh trays with dimensions of 34.2 cm long and 24 cm wide. They were introduced inside a transparent dryer with dimensions of 74 cm x 80 cm of base and a frontal height of 13 cm and posterior of 40 cm. A Checktemp 1 thermometer was placed inside the dryers to evaluate the temperature in the drying process. The initial humidity of the guava was 50.51%, the final moisture obtained in the natural convection was 8.08%, while in the forced convection it was 8.32%, after 8 hours of drying.

scholarly journals Design and Development of Fish Natural Convection Drying Facility

2013 ◽  
Vol 12 (1) ◽  
Author(s):  
Manuel A. Bajet, Jr.
Keyword(s):  
Renewable Energy ◽  
Natural Convection ◽  
Relative Humidity ◽  
Moisture Content ◽  
Experimental Research ◽  
Drying Rate ◽  
Drying Time ◽  
Fish Samples ◽  
Convection Dryer ◽  
Drying Chamber

Fish drying facility was designed, developed and tested to determine itsperformance, and characterization as a natural convection dryer for stunted tilapia.Parameters in the study were air temperature, relative humidity, drying chamber,moisture content, drying time, capacity and rate. Experimental research design wasused and materials includes, lumber painted in black and used as frames, plasticscreen mesh, cellophane, black plain sheet and stones.. Findings disclosed that dryingrate were noted at the highest during first two hours internal with an average dryingrate of 7.20 grams per minute. Average drying rate after the three trials was 2.63grams per minute. The moisture content of the samples was reduced from 92.68%-75.23% during the 20 hours of drying and weights of fish samples were also reducedfrom 20 to 15 kilograms. Further, results on relative humidity was higher at theupper trays compared that the lower trays. Return of investment was 72% and has apayback period of 0.05 year. Keywords: Renewable Energy, Project and Experimental Research, NaturalConvection Dryer, Vigan City, Ilocos Sur, Philippines

Pengeringan Biji Kakao dengan Pengering Surya Tipe Terowong Berpenggerak Sel Fotovoltaik di Manokwari

Agrotek ◽  
2018 ◽  
Vol 2 (6) ◽  
Author(s):  
Wilson Palelingan Aman
Keyword(s):  
Moisture Content ◽  
Performance Test ◽  
Initial Moisture Content ◽  
Maximum Temperature ◽  
Photovoltaic Module ◽  
Cocoa Beans ◽  
Drying Time ◽  
Tunnel Dryer ◽  
Heat Collector ◽  
New Construction

<em>A research about cocoa beans drying used solar tunnel dryer with photovoltaic module driven have conducted in Manokwari. Solar tunnel dryer used in this research adapted from type Hohenheim with photovoltaic module and integrated air heat collector has been installed at the Department of Agricultural Technology, Papua State University Manokwari to dried cocoa beans. The objectives of this research were to design solar tunnel dryer and evaluate it�s performance in dryed cocoa beans. The result obtained was a new construction of solar tunnel dryer for cocoa beans with dimensions 6 m of length and 0,9 m of wide. The dryer completed with photovoltaic module to drive the blowers of hot drying air. �Performance test of the dryer showed that drying of 10 kg of cocoa beans with initial moisture content about 70% wet basis needed 13 hours of drying time to achieved final moisture content about 7,17% wet basis. The drying time achieved was faster compared than traditional solar drying that needed 20 hours of drying time. The maximum temperature achieved in drying chamber was 60 <sup>o</sup>C.</em>

CATFISH DRYING (Clarias Batraclus) USING ‘TEKO BERSAYAP’ SOLAR DRYER

2012 ◽  
Vol 2 (1) ◽  
pp. 14-20
Author(s):  
Yuwana Yuwana
Keyword(s):  
Relative Humidity ◽  
Moisture Content ◽  
Ambient Temperature ◽  
Drying Rate ◽  
Drying Process ◽  
Drying Time ◽  
Ambient Relative Humidity ◽  
Solar Dryer

Experiment on catfish drying employing ‘Teko Bersayap’ solar dryer was conducted. The result of the experiment indicated that the dryer was able to increase ambient temperature up to 44% and decrease ambient relative humidity up to 103%. Fish drying process followed equations : KAu = 74,94 e-0,03t for unsplitted fish and KAb = 79,25 e-0,09t for splitted fish, where KAu = moisture content of unsplitted fish (%), KAb = moisture content of splitted fish (%), t = drying time. Drying of unsplitted fish finished in 43.995 hours while drying of split fish completed in 15.29 hours. Splitting the fish increased 2,877 times drying rate.

Influencia de las condiciones de secado solar en la coloración de plantas medicinales

2019 ◽  
pp. 28-34
Author(s):  
Margarita Castillo-Téllez ◽  
Beatriz Castillo-Téllez ◽  
Juan Carlos Ovando-Sierra ◽  
Luz María Hernández-Cruz
Keyword(s):  
Medicinal Plants ◽  
Forced Convection ◽  
Rural Areas ◽  
Color Change ◽  
Drying Process ◽  
Scientific Medicine ◽  
Drying Time ◽  
Bacterial Proliferation ◽  
Wide Range ◽  
Very High

For millennia, humans have used hundreds of medicinal plants to treat diseases. Currently, many species with important characteristics are known to alleviate a wide range of health problems, mainly in rural areas, where the use of these resources is very high, even replacing scientific medicine almost completely. This paper presents the dehydration of medicinal plants that are grown in the State of Campeche through direct and indirect solar technologies in order to evaluate the influence of air flow and temperature on the color of the final product through the L* a* scale. b*, analyzing the activity of water and humidity during the drying process. The experimental results showed that the direct solar dryer with forced convection presents a little significant color change in a drying time of 400 min on average, guaranteeing the null bacterial proliferation and reaching a final humidity between 9 % and 11 %.

scholarly journals Cherry Tomato Drying: Sun versus Convective Oven

Horticulturae ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 40
Author(s):  
Vincenzo Alfeo ◽  
Diego Planeta ◽  
Salvatore Velotto ◽  
Rosa Palmeri ◽  
Aldo Todaro
Keyword(s):  
Moisture Content ◽  
Initial Moisture Content ◽  
Drying Process ◽  
Drying Time ◽  
Oven Drying ◽  
Sun Drying ◽  
Different Temperatures ◽  
Final Water Content ◽  
Drying Curves ◽  
Drying Conditions

Solar drying and convective oven drying of cherry tomatoes (Solanum lycopersicum) were compared. The changes in the chemical parameters of tomatoes and principal drying parameters were recorded during the drying process. Drying curves were fitted to several mathematical models, and the effects of air temperature during drying were evaluated by multiple regression analyses, comparing to previously reported models. Models for drying conditions indicated a final water content of 30% (semidry products) and 15% (dry products) was achieved, comparing sun-drying and convective oven drying at three different temperatures. After 26–28 h of sun drying, the tomato tissue had reached a moisture content of 15%. However, less drying time, about 10–11 h, was needed when starting with an initial moisture content of 92%. The tomato tissue had high ORAC and polyphenol content values after convective oven drying at 60 °C. The dried tomato samples had a satisfactory taste, color and antioxidant values.

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