The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Lyes Bennamoun - One of the best experts on this subject based on the ideXlab platform.
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Solar Drying of wastewater sludge: A review
Renewable and Sustainable Energy Reviews, 2012Co-Authors: Lyes BennamounAbstract:Abstract Drying constitutes an important process for wastewater sludge management, as it can reduce the mass and the volume of the product and consequently the cost of storage, handling and transport. During constant operating conditions, the Drying kinetic of the sludge has shown mainly: a constant Drying rate, one or two falling rate periods and a final short period with variations along the process of the physical properties of the product with the appearance of shrinkage and cracks phenomena. Solar Drying was benefit as using free Solar energy can reduce the cost of the operation. On the other hand, it plays an important role for the pathogen reduction until Environmental protection Agency (EPA) recommendations. In some studied cases, the value of 1000 CFU g −1 DS, which represents the EPA Class A pathogen requirement, for fecal coliform was attained. The general design of used Solar dryers was constituted of: a greenhouse made with transparent material and a floor, where the product is speared in thick layers. Furthermore, fans and ventilations can be used in order to have homogeneous distribution of the air inside the greenhouse with replacement of humidified air with fresh one. Automatic or handle mix of the product was used once or for several times a day. In order to increase the performances of the Drying system, other ways such as heating the floor using Solar water heater, infrared lamps, using heat pumps or adding thermal energy storage systems were also tested. Covered Solar Drying has given better results than open Solar Drying. However, the origin of the wastewater sludge affects the obtained results. Alternatively, modeling Drying systems was effectuated using heat and mass balances, applied for the air and the dried product. Solar Drying of wastewater sludge has given satisfactory results.
Jean Koulidiati - One of the best experts on this subject based on the ideXlab platform.
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experimental characterisation and modelling of thin layer direct Solar Drying of amelie and brooks mangoes
Energy, 2011Co-Authors: A.o. Dissa, Hélène Desmorieux, D. J. Bathiebo, Ousmane Coulibaly, Jean KoulidiatiAbstract:Direct Solar Drying characteristics of Amelie and Brooks mangoes were experimentally determined using a Solar dryer made up of four trays and used under weather conditions of fruit harvest period. Direct Solar Drying curves were established, fitted using 10 mathematical models and simulated with a direct Solar Drying model. Effective diffusivity, Drying rates and Drying efficiency were estimated for each Drying day and each variety. Results showed that at least four days were necessary to reach the range of preservation water contents. Drying curves depended on variety and were suitably fitted by “two-term” and “Approximation of diffusion” models (with R2≥0.9888, RMSE≤0.0283, E≤9.1283% and χ2≤1.3314×10−4). Drying rates and Drying efficiency significantly decreased with the number of Drying days (respectively between 0 and 0.15gkg−1s−1 and between 0 and 34%) and were very close for the two varieties. Diffusivity weakly varied with variety and strongly decreased with the number of Drying days between 2.7906×10−11 and 1.8489×10−10m2/s. Drying kinetics were suitably simulated by the direct Solar Drying model (with: Amelie: R2=0.989 and E=7.623%, Brooks: R2=0.9924 and E=4.961%). The final water content was about 24.83% for Amelie and 66.32% for Brooks and Amelie was the most suitable variety for direct Solar Drying.
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A Comparative Study of Direct and Indirect Solar Drying of Mango
Global Journal of Pure and Applied Sciences, 2011Co-Authors: A.o. Dissa, Hélène Desmorieux, J. Bathiebo, Jean KoulidiatiAbstract:In this work, direct and indirect Solar Drying parameters of two mango varieties were estimated and compared using direct and indirect Solar dryers under the same meteorological conditions. For both Drying methods, Drying curves were established and fitted using 10 semi-empirical models, Drying rate and Drying efficiency curves were determined, effective water diffusivity was estimated and quality of dry slice was evaluated. Results showed that in indirect Solar Drying, the tray position in the dryer did not have an influence on Drying curves whereas in direct Solar Drying this influence was very significant. Indirect Solar Drying curves were suitably fitted by Approximation diffusion model (with R2. 0.99, RMSE.0.0387, E
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Modelling and experimental validation of thin layer indirect Solar Drying of mango slices
Renewable Energy, 2009Co-Authors: A.o. Dissa, Hélène Desmorieux, J. Bathiebo, S. Kam, P.w. Savadogo, Jean KoulidiatiAbstract:The thin layer Solar Drying of mango slices of 8mm thick was simulated and experimented using a Solar dryer designed and constructed in laboratory. Under meteorological conditions of harvest period of mangoes, the results showed that 3 “typical days” of Drying were necessary to reach the range of preservation water contents. During these 3 days of Solar Drying, 50%, 40% and 5% of unbound water were eliminated, respectively, at the first, second and the third day. The final water content obtained was about 16±1.33% d.b. (13.79% w.b.). This final water content and the corresponding water activity (0.6±0.02) were in accordance with previous work. The Drying rates with correction for shrinkage and the critical water content were experimentally determined. The critical water content was close to 70% of the initial water content and the Drying rates were reduced almost at 6% of their maximum value at night. The thin layer Drying model made it possible to simulate suitably the Solar Drying kinetics of mango slices with a correlation coefficient of r2=0.990. This study thus contributed to the setting of Solar Drying time of mango and to the establishment of Solar Drying rates' curves of this fruit.
Peter A. Munro - One of the best experts on this subject based on the ideXlab platform.
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mathematical modelling of the thin layer Solar Drying of sweet potato slices
Solar Energy, 1993Co-Authors: Lm Diamante, Peter A. MunroAbstract:Abstract An indirect Solar dryer was used to study the Drying of sweet potato slices. The Solar Drying rates of sweet potato slices were affected by the fluctuating chamber temperature over the Drying period. Solar Drying rate curves exhibited a constant rate period and one linear falling rate period. A mathematical model for Solar Drying of sweet potato slices was derived based on the simplified form of the Fick's diffusion equation. The mathematical model could satisfactorily describe the Solar Drying of sweet potato slices to a moisture content below 20% dry basis. The mean effective Drying chamber temperature and sample thickness were the main factors that affected the Solar Drying process for sweet potato slices.
Haydar Kucuk - One of the best experts on this subject based on the ideXlab platform.
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Assessment of exergetic sustainability indicators for a single layer Solar Drying system
International Journal of Exergy, 2015Co-Authors: Adnan Midilli, Haydar KucukAbstract:This paper aims to develop and assess the exergetic sustainability indicators for a single layer Solar Drying process of the shelled and unshelled pistachio samples. For this purpose, in terms of the Second Law of Thermodynamics, the exergetic sustainability indicators such as exergetic efficiency, waste exergy ratio, exergy recoverability ratio, exergy destruction ratio, environmental impact factor and exergetic sustainability index are defined and estimated by depending on the experimental data, previously obtained from the single layer Solar Drying system. Accordingly, it can be said that these indicators are quite important to find out the exergetic, environmental and sustainability aspects of Solar Drying processes and systems. Under this important conclusion, it is observed that the increase of the waste exergy ratio decreases the exergetic efficiency and exergetic sustainability index while increasing environmental impact factor.
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Exergy-Based Sustainability Indicators for a Single Layer Solar Drying Process
Progress in Exergy Energy and the Environment, 2014Co-Authors: Adnan Midilli, Haydar KucukAbstract:The main objective of this study is to develop the exergetic sustainability indicators for a single layer Solar Drying process of the shelled and unshelled pistachio samples. In this regard, the exergetic sustainability indicators such as exergetic efficiency, waste exergy ratio, exergy recoverability ratio, exergy destruction ratio, environmental impact factor, and exergetic sustainability index are defined and estimated by depending on the experimental data obtained from the single layer Solar Drying process. Accordingly, it is noticed that the rise of waste exergy ratio decreases the exergetic efficiency and exergetic sustainability index while increasing environmental impact factor.
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energy and exergy analyses of Solar Drying process of pistachio
Energy, 2003Co-Authors: Adnan Midilli, Haydar KucukAbstract:This paper is concerned with the energy and exergy analyses of the Drying process of shelled and unshelled pistachios using a Solar Drying cabinet. Using the first law of thermodynamics, energy analysis was carried to estimate the amounts of energy gained from Solar air collectors and the ratios of energy utilization. However, exergy analysis was accomplished to determine the location, type, and magnitude of exergy losses during the Solar Drying process by applying the second law of thermodynamics. It was deduced that the exergy losses took place mostly in the 15th shelf where the available energy was less utilized. Moreover, the shelled and unshelled pistachios are sufficiently dried in the ranges between 40 and 60 °C and 37 and 62% of relative humidity at 1.23 m s−1 of Drying air velocity in 6 h despite the exergy losses of 0.15–3.08 kJ kg−1.
Ahmad Fudholi - One of the best experts on this subject based on the ideXlab platform.
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Energy-economic-environmental analysis of Solar Drying system: a review
International Journal of Power Electronics and Drive Systems (IJPEDS), 2020Co-Authors: Wan Nurlaila Yusra Mat Desa, Ahmad Fudholi, Zahira YaakobAbstract:Solar Drying is an emerging technology to preserve wide range of products from agriculture to animal-based products. The application of Solar dryers, however must be evaluated to determine its benefit and effectiveness. In the evaluation of Solar dryer performance, three criteria which are most important to look at are thermal performance, economic cost and environmental implications. Therefore, this paper attempts to review the thermoeconomic analysis and environmental evaluation on various Solar Drying system. Performance equations in energy–economic–environment analyses for Solar Drying syistems evaluation are presented. The CO2 emission, carbon mitigation, and earned carbon credit of various Solar Drying syistem are also presented.
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performances and improvement potential of Solar Drying system for palm oil fronds
Renewable Energy, 2015Co-Authors: Ahmad Fudholi, Kamaruzzaman Sopian, Mohd Hafidz Ruslan, M A Alghoul, Mohd. Yusof OthmanAbstract:In this study, an indirect forced convection Solar Drying system was tested for Drying of palm oil fronds. The Drying of 100 kg of palm oil fronds via Solar Drying system reduced the moisture content from 60% (w.b) to 10% (w.b) in 22 h (3 d of Drying). During the Drying process, the daily mean values of the Drying chamber inlet temperature, Drying chamber outlet temperature, Drying chamber air temperature, and Solar radiation ranged from 26 °C to 75 °C, 25 °C–65 °C, 26 °C–67 °C, and 96 W/m2 to 1042 W/m2 respectively, with corresponding average values of 53 °C, 46 °C, 48 °C, and 580 W/m2. At average Solar radiation of about 600 W/m2 and air flow rate 0.13 kg/s, the collector, Drying system and pick-up efficiencies were found about 31%, 19% and 67% respectively. The specific moisture extraction rate (SMER) was 0.29 kg/kWh. The exergy efficiency varied between 10% and 73%, with an average of 47%. In addition, the improvement potential of Solar Drying system for palm oil fronds ranged from 8 W to 455 W, with an average of 172 W.
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Performance analysis of Solar Drying system for red chili
Solar Energy, 2014Co-Authors: Ahmad Fudholi, Kamaruzzaman Sopian, M. H. Yazdi, Mohd Hafidz Ruslan, Mohamed Gabbasa, Hussein A. KazemAbstract:Abstract This study is concerned with performance analysis of Solar Drying system for red chili. Red chili was dried to final moisture content of 10% w.b from 80% w.b in 33 h using this system. In this study, energy and exergy analyses of the Solar Drying process were performed for red chili. Using the first law of thermodynamics, energy analysis was carried out to estimate the useful energy gained from the collectors. However, exergy analysis during Solar Drying process was estimated by applying the second law of thermodynamics. The specific energy consumption (SEC) was 5.26 kW h/kg. The values of evaporative capacity and improvement potential were from 0.13 kg/s to 2.36 kg/s and 0 W to 135 W, respectively. The efficiencies of the Solar collector, Drying system, pick-up, and exergy were 28%, 13%, 45%, and 57% respectively, at an average Solar radiation of 420 W/m2 and a mass flow rate of 0.07 kg/s.
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Energy and exergy analyses of Solar Drying system of red seaweed
Energy and Buildings, 2014Co-Authors: Ahmad Fudholi, Kamaruzzaman Sopian, Mohd. Yusof Othman, Mohd Hafidz RuslanAbstract:Abstract A Solar Drying system was designed, constructed and tested for Drying of seaweed. Seaweed is a potential source of renewable energy, and it can be converted into energy such as biofuel oil, biodiesel and gas. Red seaweed was dried to the final moisture content of 10% from 90% w.b in 15 h. Drying kinetics of red seaweed were investigated and obtained. The nonlinear regression procedure was used to fit three different Drying models. The Page's model clearly showed a better fit to the experimental data between Newton's model and Henderson and Pabis model. The Page's model was resulted in the highest value of R2 and lowest values of MBE and RMSE. At average Solar radiation of about 500 W/m2 and air flow rate 0.05 kg/s, the collector, Drying system and pick-up efficiencies were found about 35, 27 and 95%, respectively. This study was performed with energy analysis and exergy analyses of the Solar Drying process of red seaweed. The specific energy consumption (SEC) of 2.62 kWh/kg was obtained. Moreover, the exergy efficiency of Solar Drying ranged from 1% to 93%, with an average of 30%. The values of improvement potential were found to be in the range of 0.3 and 630 W, with an average of 247 W.