Exergy-Based Sustainability Indicators for a Single Layer Solar Drying Process

2014 ◽  
pp. 705-712 ◽  
Author(s):  
Adnan Midilli ◽  
Haydar Kucuk
Keyword(s):  
Single Layer ◽  
Sustainability Indicators ◽  
Solar Drying ◽  
Drying Process

Impact of solar drying process on drying kinetics, and on bioactive profile of Moroccan sweet cherry

2020 ◽  
Vol 151 ◽  
pp. 908-918 ◽  
Author(s):  
Rachida Ouaabou ◽  
Bouchra Nabil ◽  
Mourad Ouhammou ◽  
Ali Idlimam ◽  
Abdelkader Lamharrar ◽  
...  
Keyword(s):  
Sweet Cherry ◽  
Drying Kinetics ◽  
Solar Drying ◽  
Drying Process

scholarly journals Numerical study of the greenhouse solar drying of olive mill wastewater under different conditions

2020 ◽  
Vol 12 (4) ◽  
pp. 168781401988974 ◽  
Author(s):  
Chaima Bouraoui ◽  
Fayçal Ben Nejma
Keyword(s):  
Mass Fraction ◽  
Numerical Study ◽  
Meteorological Conditions ◽  
Olive Mill Wastewater ◽  
Comsol Multiphysics ◽  
Solar Drying ◽  
Drying Process ◽  
After Hours ◽  
Vapor Mass ◽  
Olive Mill

The aim of this work is to develop thermal modeling of the olive mill wastewater drying process in a greenhouse solar dryer. A configuration was thus proposed and simulated using the commercial software COMSOL Multiphysics in order to solve the conservation equations governing our problem. The resulting simulations are used to evaluate the temperature, velocity, and vapor mass fraction distributions after hours of sunshine and to provide a quantification of the drying process. The influence of the greenhouse effect on the drying kinetics is highlighted by comparing to open sun-drying results. The effect of some greenhouse geometric characteristics and external meteorological conditions are studied.

Impact of tilling on biosolids drying and indicator microorganisms survival during solar drying process

2014 ◽  
Vol 49 (14) ◽  
pp. 1701-1709 ◽  
Author(s):  
Inhong Song ◽  
Teodulo Dominguez ◽  
Christopher Y. Choi ◽  
Moon Seong Kang
Keyword(s):  
Solar Drying ◽  
Drying Process ◽  
Indicator Microorganisms

Thermodynamic analysis of the apple drying process

2005 ◽  
Vol 219 (1) ◽  
pp. 1-14 ◽  
Author(s):  
E. K. Akpinar ◽  
A Midilli ◽  
Y Bicer
Keyword(s):  
Thermodynamic Analysis ◽  
Single Layer ◽  
Second Law Of Thermodynamics ◽  
Energy Utilization ◽  
Drying Process ◽  
Cent Relative Humidity ◽  
Apple Slices ◽  
Drying Conditions ◽  
Drying Chamber ◽  
Exergy Losses

This paper is concerned with thermodynamic analysis of the process of single-layer drying of apple slices by means of a cyclone-type dryer. Using the first law of thermodynamics, energy analysis was performed to estimate the ratios of energy utilization throughout the drying process. Exergy analysis was carried out to determine exergy losses during the drying process by applying the second law of thermodynamics. It was concluded that the exergy losses increased with increasing energy utilization in both trays and the drying chamber. Values of the energy utilization ratio (EUR) of the drying chamber varied in the range 0−41.64 per cent depending on the drying conditions. The most exergy losses took place on the first tray (EUR = 0−21.06 per cent) during the drying of apple slices. It is emphasized that apple slices are sufficiently dried in the range 60−80°C with 20−10 per cent relative humidity and a drying air velocity of 1.5 m/s over a 3.33−5.33 h period in spite of exergy losses of 0−1.243 kj/s (EUR = 0−34.72 per cent).

scholarly journals Mathematical Model for Solar Drying of Grains

2019 ◽  
pp. 1-18
Author(s):  
A. O. Fagunwa ◽  
O. A. Aregbesola ◽  
M. O. Faborode
Keyword(s):  
Mathematical Model ◽  
Thermal Properties ◽  
Moisture Content ◽  
Climatic Conditions ◽  
Drying Rate ◽  
Solar Drying ◽  
Drying Process ◽  
Complex Procedure ◽  
Unique Method ◽  
Complex Phenomena

Mathematical modeling of drying process is a complex procedure that should be carefully done. Moreso, model for solar drying, which is a unique method of drying due to constant fluctuation in the climatic conditions, requires complete integration of the complex phenomena that are involved for accurate prediction of moisture content and drying rate. A mathematical model was developed from heat and mass balance equation considering the physical and thermal properties of the grain, meteorological factors and convective heat transfer during solar drying of grains. The data obtained from the model was compared with experimental results obtained using a solar dryer to dry five selected grains – cowpea, soyabean, groundnut, maize and sorghum at airflow rates of 0.22 m/s, 0.76 m/s and 0.94 m/s. The results from statistical analysis and regression analyses used to compare the results showed that the model is adequate in predicting the moisture content and drying rate of the selected grains as well as other agricultural products with closer physical and thermal properties.

scholarly journals Preliminary study of drying of natural coffee by cyclical pressure changes

DYNA ◽  
2020 ◽  
Vol 87 (214) ◽  
pp. 53-60
Author(s):  
Alfonso Parra-Coronado ◽  
Oscar Leonardo García-Navarrete ◽  
Francy Alejandra Vanegas-Izquierdo ◽  
José Alfredo Gamboa-Gamboa ◽  
Andrés Felipe González-Mora ◽  
...  
Keyword(s):  
Low Temperature ◽  
Solar Drying ◽  
Drying Process ◽  
Cyclic Pressure ◽  
Preliminary Study ◽  
Drying System ◽  
The One ◽  
Pressure Changes ◽  
Cup Quality

A “special coffee” is obtained with an adequate drying process, which allows the preservation of volatile substances responsible for excellent cup quality. The aim was to carry out preliminary studies of drying of natural coffee by implementing a Cyclic Pressure Changes (CPCD) dryer, comparing it with solar drying and with a mechanical drying system by forced convection of low-temperature air. The drying times and rates of the systems used were compared, as well as the respective valuation of the cup quality. Drying times were 767 h for solar drying system, without reaching the desired moisture content; 153.5 h for mechanical drying system and 449 h for the CPCD system. However, the global cup tests showed a better quality of the grain obtained with the CPCD system (87 points), than the one obtained with the mechanical drying at 35°C (84 points).

Solar Drying of Ivy Gourd: Influence of Various Dipping Solutions on Activation Energy and Moisture Diffusivity

2021 ◽  
Author(s):  
Elavarasan Elangovan ◽  
Gulivindala Anil Kumar
Keyword(s):  
Activation Energy ◽  
Ascorbic Acid ◽  
Shelf Life ◽  
Forced Convection ◽  
Moisture Diffusivity ◽  
Sugar Solution ◽  
Solar Drying ◽  
Drying Method ◽  
Drying Process ◽  
Ivy Gourd

Abstract The study is aimed to enhance the shelf life of ivy gourd through solar drying method in open, forced and natural convection mode. Ivy gourd is treated as primary agent to prepare medicines and the stems, leaves; flowers are used to cure the diseases related diabetics, ulcer, skin. The normal shelf life is 2-3 days and it can be increased up to 6 months with an effective drying process. The experiment is intended to find the best drying process among the open, natural and forced convection mode with an initial dipping method with ascorbic acid, lemon juice, sugar solution, honey solutions individually and a control sample (without dipping). A 3kg sample of ivy gourd is dipped in 10g/L of the each of the solution and it is used for the three drying process individually. The obtained results are indicating that forced convection method for ascorbic acid is best among the other drying method with highest moisture diffusivity is 7.88×10-8 m2/s and lowest activation energy 21.12 kJ/mol. It was observed that the drying kinetics of ivy gourd should be considered an indicator of efficiency for solar drying technique from environmental safety perspective. The influence of dipping solution and drying mechanisms on the functionalities of drying are discussed with suitable illustrations.

Numerical analysis of 3D heat and mass transfer in cocoa beans under a solar drying condition with a thermal storage material

2021 ◽  
pp. 1-8
Author(s):  
Clement A. Komolafe ◽  
M. Adekojo Waheed ◽  
Chidozie Ezekwem ◽  
Ching-Lik Hii
Keyword(s):  
Mass Transfer ◽  
Numerical Analysis ◽  
Heat And Mass Transfer ◽  
Three Dimensional ◽  
Thermal Storage ◽  
Cocoa Bean ◽  
Solar Drying ◽  
Drying Process ◽  
Storage Material ◽  
Cocoa Beans

Abstract This study investigated the numerical analysis of heat and mass transfer during solar drying of cocoa beans with firebrick thermal storage material (FTSM). The continuity, momentum, energy, and species equations were solved for a three-dimensional ellipsoidal cocoa-bean using the Finite Volume Method with the aid of ANSYS, a Computational Fluid Dynamics software. The simulated and experimental maximum product (Cocoa) temperatures of 53 and 53.5 °C respectively were in agreement with each other. The results obtained in this study will help the stakeholders in the cooa processing industries in the design of the drying system, selection of suitable drying conditions, and prediction of heat and mass transfer in the drying process of cocoa, enhancement of better quality attributes such as colour and flavour, reduction in the cost of design and time in the drying process.

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