Article
Energy & Fuels
Azim Dogus Tuncer, Ali Amini, Ataollah Khanlari
Summary: This study aimed to enhance the performance of a solar drying system by utilizing ZnO nano-enhanced absorber coating and infrared heating system, resulting in improved thermal and exergetic efficiencies and reduced drying time.
Article
Energy & Fuels
Fatih Selimefendigil, Ceylin Sirin, Hakan F. Oztop
Summary: By modifying the greenhouse drying system with solar absorber and thermally insulated north wall, as well as coating the designed north wall with graphene nanoplatelet-embedded black paint, drying time can be significantly reduced and efficiency improved.
Article
Thermodynamics
Sara Baddadi, Safa Skouri, Rabeb Ayed, Laxmikant Jathar, Salwa Bouadila
Summary: This study compares the performance of four solar collectors in an indirect forced convection solar dryer and finds that a pioneering heating unit increases the temperature by 30 degrees Celsius compared to other collectors. The heating unit has an annual energy consumption of 640 kWh/year and an energy payback period of 2.5 years, while reducing CO2 emissions by 39 tons.
APPLIED THERMAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Mehmet Das, Ebru Kavak Akpinar
Summary: The study aimed to increase the thermal efficiency of the solar air collector (SAC) by adding a two-direction solar tracking feature, supported by PLC. Results showed that the SACD with solar tracking feature had significantly higher thermal and drying efficiency compared to the one without this feature.
Article
Thermodynamics
Emine Yagiz Gurbuz, Istemihan Sahinkesen, Baris Kusun, Azim Dogus Tuncer, Ali Kecebas
Summary: The current study aimed to enhance the performance of an unglazed solar air collector by using mesh tubes for extended heat transfer surfaces and nano-enhanced black paint as a thermal conductivity booster. Three types of unglazed solar air collectors were designed, produced, and tested, showing that the combined usage of mesh tubes and nano-enhanced absorber coating improved the mean thermal performance by 40.45% compared to the unmodified system. Energy-exergy analysis and an enviro-economic survey were also conducted in this research. Rating: 8 out of 10.
Article
Thermodynamics
Sukhmeet Singh, R. S. Gill, V. S. Hans, T. C. Mittal
Summary: The walk-in solar greenhouse dryer, integrated with a solar air heating system, has been shown to have low energy payback period and cost payback period during turmeric drying processes. The efficiency of the dryer is high, and the quality of dried turmeric is superior to open sun drying.
Article
Energy & Fuels
Shivam Prajapati, Namith Naik, V. P. Chandramohan
Summary: This study numerically investigated the effect of providing triangular corrugations on the heat transfer performance of a solar air collector using ANSYS Fluent. The results showed that the corrugated surface significantly enhanced the heat transfer compared to a smooth plate, particularly at specific pitch values.
Article
Energy & Fuels
Hind Krabch, Rachid Tadili, Ahmed Idrissi, Mohammed Bargach
Summary: This study presents the experimental results of an indirect solar dryer with a single compartment. The unique design of the dryer enhances heat transfer and drying efficiency, resulting in decreased relative humidity and faster drying time for agricultural products. The cost-effective nature of this dryer makes it an attractive option for local producers.
Article
Green & Sustainable Science & Technology
Hussain H. Al-Kayiem, Ali A. Ismaeel, Aklilu T. Baheta, Mohammed A. Aurybi
Summary: The study demonstrates the use of Al2O3-in-black paint coating to enhance the performance of a solar vortex power generator. The Al2O3-in-black paint showed the best photothermic conversion results, significantly improving thermal efficiency and air temperature rise.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Green & Sustainable Science & Technology
Santanu Malakar, Vinkel Kumar Arora, Prabhat K. Nema
Summary: The study designed and developed an evacuated tube collector-based solar dryer with heat pipe for drying garlic cloves. Experimental results showed that the dryer performed best at an air flow velocity of 2 m/s, capable of efficiently drying garlic cloves within 8 hours with a short payback period of 1.3 years.
Article
Thermodynamics
Pimpan Pruengam, Siwalak Pathaveerat, Prasertsak Pukdeewong
Summary: A double-sided solar collector dryer was designed and tested, showing a higher efficiency than natural sun drying and a faster drying rate for bananas. The thermal efficiency of the solar collector was significantly better than that of the dryer.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Ali Etem Gurel, Umit Agbulut, Alper Ergun, Ilhan Ceylan, Adnan Sozen, Azim Dogus Tuncer, Ataollah Khanlari
Summary: Solar thermal systems are commonly used for sustainable thermal energy, and a temperature-controlled fluidized bed solar drying system has been successfully designed in this study. The efficiency of the system was found to be 64%, with the flat plate and plate with zigzag fins achieving exergy efficiencies of 7.2% and 11.6% respectively. Response surface methodology was used to model moisture content values, showing accurate predictions with high fitting performance.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Thermodynamics
Carine Pamela Aghogue Donchi, Ernest Leontin Lemoubou, Herve Thierry Tagne Kamdem, Rene Tchinda
Summary: This paper investigates the impact of nonlinear optical properties on the thermal performance of an indirect solar dryer. By establishing a nonlinear model and performing numerical analyses, it is found that the use of nonlinear parameters can significantly enhance the thermal performance of the collector.
HEAT AND MASS TRANSFER
(2022)
Article
Energy & Fuels
Chandra Shekhar Koli, M. K. Gaur, Pushpendra Singh
Summary: In this study, a parabolic hybrid active greenhouse solar dryer (PHAGSD) with a solar air heater (SAH) was designed and fabricated. The effects of SAH on the drying performance were investigated. The results showed that the dryer with SAH had higher thermal and exergy efficiency compared to the dryer without SAH.
Article
Energy & Fuels
Fatih Selimefendigil, Ceylin Sirin
Summary: The study investigates the impact of utilizing nano-enhanced thermal energy storage unit on the performance of a greenhouse dryer, comparing different types of greenhouse dryers. Results show that utilizing nano-enhanced modification significantly reduces drying time and improves energy efficiency.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Vanipenta Ravi Kumar, Obulesu Mopuri, Mohamed Issam Elkhazen, Charankumar Ganteda, M. Umamaheswar, Walid Hassen, Sami Ullah Khan, Nidhal Ben Khedher, Lioua Kolsi
Summary: The objective of this study is to observe the contribution of Soret and Dufour effects in oscillating shield for cross diffusion flow. The dimensionless problem is obtained via introducing the appropriate set of variables. The numerical outcomes are suggested by using the most interesting explicit finite difference scheme. Moreover, the aspect of physical quantities involving the flow are graphically reported.
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
(2023)
Article
Thermodynamics
Samah Maatoug, Ali Moulahi, Naseem Bazuhair, Shatha Alqarni, Fatih Selimefendigil, Walid Aich, Lioua Kolsi, Abdallah Mhimid
Summary: This study proposes a new cooling system for thermal management and cooling of photovoltaic systems using pulsating flow with multiple jet impingement and different fluid types. Hybrid nanofluid and alumina-water nanofluid are used as the cooling medium. The study explores the effects of various parameters and concludes that pulsating amplitude has a greater influence on cooling performance enhancement compared to frequency. The system using alumina-water nanofluid with cylindrical shaped nanoparticles proves to be the most effective cooling system.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Physics, Applied
Momen S. M. Saleh, Said Mekroussi, Sahraoui Kherris, Yousra Boutera, Mohamed Taher Bouzaher, Noureddine Belghar, Ali J. Chamkha, Lioua Kolsi
Summary: The aim of this study is to numerically investigate the impact of a rotating cylinder and porous layers on forced convection in a bifurcating grooved channel filled with two types of nanofluids (MgO-water, SiO2-water). The governing equations were solved using the semi-implicit finite volumes method. The effects of Reynolds number, nanoparticles volume fraction, and cylinder rotation speed on hydro-thermal performances were examined. The results show that the rotation direction of the cylinder significantly affects the formation of vortices in the branching channel, with clockwise rotation leading to vortices in the vertical channel that decrease with increasing Reynolds number. Furthermore, using a bifurcating grooved channel with a porous medium enhances heat transfer rate at the vertical and horizontal walls of the porous layer by 52% and 49% respectively. Additionally, the heat transfer rate is improved by 2.6% when using MgO nanoparticles compared to SiO2. Therefore, the use of bifurcating grooved channels can enhance the thermal performance of various applications in thermal engineering, from fuel cells to electronic cooling.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Physics, Applied
Muhammad Nawaz, Mondher Hamzaoui, Muhammad Dawood Bukhari, Ghulam Mustafa, Sami Ullah Khan, Abdelkarim Aydi, Lioua Kolsi
Summary: Coal-fired thermal power plants are upgrading their technology to meet global energy demands. This study focuses on the design and analysis of a superheater tube bundle for a 660MW coal-fired supercritical boiler. Thermal and structural analyses are conducted to investigate temperature distribution, heat flux, stresses, strains, and deformations. Comparisons are made between different materials, and it is found that martensitic steel exhibits superior thermal performance, while austenitic steel has lower strain compared to martensitic steel.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Optics
Mohamed Boujelbene, Sonia Ezeddini, Lotfi Ben Said, Emin Bayraktar, Muapper Alhadri, Walid Aich, Kaouther Ghachem, Lioua Kolsi
Summary: This study focuses on the gas-assisted laser cutting of Ti-Al intermetallic composite, which is a lightweight material with excellent mechanical properties. The effects of laser output power and cutting speed on the surface integrity of the cut edges are investigated experimentally. The results show that the best surface results can be achieved at lower laser power and lower to medium cutting speeds, which differs from other materials.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Physical
Sofiene Mellouli, Fatma Bouzgarrou, Talal Alqahtani, Salem Algarni, Kaouther Ghachem, Lioua Kolsi
Summary: This study proposes a new configuration of metal hydride (MH) - phase change material (PCM) composite disks, which improves the thermal performance and enhances the release rate and reaction rate of hydrogen by 37.68%. The geometrical parameters of the MH truncated cone and the heat transfer model are optimized to achieve this enhancement.
Article
Green & Sustainable Science & Technology
Sana Said, Sofiene Mellouli, Talal Alqahtani, Salem Algarni, Ridha Ajjel, Kaouther Ghachem, Lioua Kolsi
Summary: An experimental study evaluated the thermal performance of different types of evacuated tube solar collectors (ETSCs) for water heating. The results showed that the ETSC system performed well at higher solar irradiance and lower water flow rates. Furthermore, the helical tube-based ETSC demonstrated a higher thermal efficiency compared to other configurations, making it a promising heat exchanger for ETSCs.
Article
Thermodynamics
Sadique Rehman, Wasim Jamshed, Mohamed R. Eid, Kashif Irshad, Amjad Ali Pasha, Salem Algarni, Sayed M. El Din, Talal Alqahtani
Summary: Mineral oil plays a crucial role in various manufacturing, technological, and industrial processes. This study focuses on the exact solution of unsteady convective flow of a Maxwell nanofluid with radiation and uniform heat flux. Nanoparticles of Al2O3 are suspended in mineral oil to form a homogeneous nanofluid solution. The governing equations are transformed into dimensionless form, and the Laplace transform method is used to obtain the solutions for energy and momentum profiles. The effects of different dimensionless variables and parameters on the solutions are analyzed, and a comparison between Newtonian and Maxwell fluids is presented.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Mathematics
Zia Ullah, Nifeen H. Altaweel, Musaad S. Aldhabani, Kaouther Ghachem, Muapper Alhadri, Lioua Kolsi
Summary: The present study investigates the oscillatory magnetic flux and heat transfer in the presence of variable surface temperature in electrically conductive fluid flow across a heated circular cylinder. A time-dependent mathematical formulation is proposed, which is the source of the amplitude and fluctuation in this analysis. The effects of various parameters, such as surface temperature parameter beta and magnetic Prandtl parameter gamma, are studied.
Article
Thermodynamics
Fatih Selimefendigil, Kaouther Ghachem, Hind Albalawi, Badr M. Alshammari, Taher Labidi, Lioua Kolsi
Summary: This study analyzes the coupled interactions between magnetic field, wall elasticity, and the corrugation of the packed bed container during nanofluid convection in a triangular shaped vented cavity. The numerical analysis considers the Cauchy number, Hartmann number, number of waves, and nanoparticle solid volume fraction. Higher Ca and Ha values have a positive impact on phase change and thermal process. The reduction in phase transition time and heat transfer improvements are observed. The optimum configuration is found for an elastic wall.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Taysir Mhedheb, Walid Hassen, Abdallah Mhimid, Mohammed A. Almeshaal, Muapper Alhadri, Lioua Kolsi
Summary: This study validates the incorporation of paraffin phase change materials (PCMs) in a storage tank as a means to significantly prolong the operational duration of solar systems. Additionally, the addition of 1% concentration of hybrid nanoparticles enhances the storage tank temperature and reduces the melting time.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Tanveer Sajid, Wasim Jamshed, Mohamed R. Eid, Salem Algarni, Talal Alqahtani, Rabha W. Ibrahim, Kashif Irshad, Syed M. Hussain, Sayed M. El Din
Summary: This work presents a unique theoretical mathematical model of ternary hybrid nanofluid to enhance heat transfer. The tri-hybrid nanoparticles TiO2, Al2O3, and AA7072 are mixed with ethylene glycol to form the TiO2+Al2O3+AA7072/EG mixture. The tri-hybrid nanofluid is analyzed as a 3-D flow with variable temperature and radiative flux. The results show that the tri-hybrid nanofluid has better thermal conductance than the hybrid nanofluid, and the fluid's velocity and temperature increase due to thermal radiative flux and variable thermal conductivity effects.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Mehboob Ali, Amjad Ali Pasha, Rab Nawaz, Waqar Azeem Khan, Kashif Irshad, Salem Algarni, Talal Alqahtani
Summary: This study investigates the convective flow of non-Newtonian fluid on an exponentially stretchable surface, taking into account the effect of nanoparticles in the heat and mass equations. Non-dimensionless equations are solved using the numerical approach Bvp4c after applying transformation techniques. The analysis of velocities, heat and mass transport is conducted through figures, and comparative analysis of drag forces, Nusselt number and Sherwood number is done with tabulated values. The results show that the temperature field strengthens with an increase in thermophoresis and random diffusions, and both temperature and concentration profiles increase with the rise in the thermophoresis effect parameter.
Article
Thermodynamics
Sofiene Mellouli, Talal Alqahtani, Faouzi Askri, Abdullateef H. Bashiri, Salem Algarni
Summary: Thermochemical energy storage systems using coupled metal hydrides have the potential for high efficiency with latent heat storage and release. The screening of appropriate hydrides and phase change materials can optimize the performance of the system.
APPLIED THERMAL ENGINEERING
(2024)
